I haven't got out to collect anywhere nearly enough this season, and we're already cruising into summer. But I have been working steadily at the drawing table and the prep bench. I'm just about done all the more recent fossils in the preparation queue, with mostly tedious stuff left.
Pictured above were some very awkward, crushed Penn Dixie Eldredgeops rana that I took on as a prep challenge. There wasn't much showing initially, but I knew they were complete despite their contorted orientation. This was a very delicate prep as crushed bugs like these are riddled with cracks, and it wouldn't take too much abrasion or even handling to pop off shell. They are very thin, but I'm proud of the effort I took to do these up properly.
This is a closeup of a very wee bug (~1.7 cm). There's still some matrix in the segments to remove, but it is effectively complete.
Given the number of rollers I have on hand, I can take a few more adventurous risks in preparation. I've done quite a few pedestaled rollers already, so in this case I wanted to cut as deeply as I could into the ventral side. In this one, I've exposed the cephalic doublure, and a portion of the hypostome (the rest is tucked under the impacted pygidium). Soon I hope to do a full dorsal-ventral prep.
This is another wee bug (~1.7 cm) with problems that make it more a B-grader, and so ripe for a prep experiment. What is not shown in this top-down image is my attempt to pedestal this one -- a trickier proposition with a smaller prone.
The two images above show the tiny bug's suspended/perched state. I could have been even more daring, but for a first try at cutting under a prone, I'm happy with it.
I was able to spend the day mucking around in the Hungry Hollow Member. Lots of the usual stuff that I won't show here like gastropods (a very large Spinplatyceras), and acres of coral that just gets in the way of this turbid bed. My goal was to find complete examples of the trilobites Pseudodechenella and Crassiproetus. Fragments abound, but in this puree of a depositional environment full specimens are quite prized and rare. Obviously I did not succeed in finding a full one, but the cranidium of a Crassiproetus above is quite massive (~2 cm along the sagittal), which would have made the full one 6-9 cm in length. I cleaned this one up using baking soda abrasion.
And relatively fresh from the sketching table, two relatively common but cherished Ordovician species. I am trying out a few new tricks on achieving some degree of photo-realism with pencils, and I think it is paying off.
My next post will likely be after the weekend biannual trip to Bowmanville as I hunt one of the few remaining locations for decent Ordovician material. Until then...
Now that my replacement stylus has arrived, it's back to the lab. I've got a bit of a backlog of pieces to prep, so I could have worse problems! I prepare my fair share of these bugs, but this one will present some opportunities to try out some new preparation approaches.
This is how I found it in its field fresh state at Penn Dixie. I bucketed it on account of seeing the full roller.
Another WIP is photobombing this one at the top, but after some exploratory scribing, I encountered two more rollers. Sadly, my scribe blasted off a piece of the middle one, but I can do some restoration with Milliput once I'm done. My goal here is not to be as trilobitocentric, but to prep the brachiopod at the top, and the rugose coral below to make it an association piece emblematic of PD fauna.
Who needs acres of bulk matrix? My ME-9100 sails through the stuff. The leftmost bug is pretty much fine as it stands without more bulk matrix removal, so it just needs a good blasting. I'll work to expose the middle bug's cephalon, but have to be careful not to overexpose its pygidium and thorax given its close proximity to the brach and the other bug. Still, I can do some very precise work with the Aro to create a kind of "channel" between them. The rightmost bug has its cephalon matrix-down, so I'll prep this one with its back showing.
Just to give a sense of the levels I'm working, this perspective shows it is not just like a flat slab. I've been carefully exposing more of the bugs as well as the coral and brach. Once that is done, matrix prep, blasting, and final touches. I'll update this as I go. Stay tuned...
Recently returned from a three-day dig in New York. Despite all the lovely weather leading up to the trip, an almost wintry weather system was working its way through this part of the world with a lot of cold and precipitation. Not exactly pleasant collecting conditions!
Day 1: Penn Dixie
The excavator had been busy the days leading up to our visit. 160 fresh new piles of Windom shale were dug up and off limits until the annual Dig with the Experts event in May. The excavator did dig up one promising area. One of my field comrades had already visited the day before to start a bench and was finding some good material.
Friday was brutal. We only managed to stay out for three hours given the pouring rain, sleet, and the lake wind. In fact, it was so cold and wet that I didn't really take any site or collector pics.
Despite digging for only three hours, we still managed to find examples of just about every trilobite species reported at the site, missing only Pseudochenella. The two above are Bellacartwrightia sp., Eldredgeops rana, and the bottom two are Greenops barberi and Dipleura dekayi. The Dipleura is exceedingly rare at Penn Dixie, and was found in the Bayview bed.
Day 2: Deep Springs Road
Now an annual tradition, Fossil Forum members congregate at a spot in central New York, a shale outcrop on Deep Springs Road. It was snowing for a bit. Deb sat this one out, but went to Penn Dixie later in the day to find some trilobites.
As I had already hoovered up most of the usual fauna from this site last year with representatives of most of the brachs and bivalves, my sole goal was to find a complete Dipleura dekayi. Sadly, my efforts were for naught after six hours of slabbing and splitting. Most other stuff I found I gave away to other collectors there.
I did find these two phyllocarid carapaces (Rhinocaris columbina) that I gifted to my good friend Tim who had also found an amazing phyllocarid telson.
I didn't do so well on the trilobite front. It was mostly partials for me.
One of the other traditions of this meet-up is that we exchange fossil gifts. Pictured above on the left is a chunk of dinosaur jaw from Tony that could be Triceratops or Edmontosaurus. Top right are two Elrathia kingii from James who just came back from Utah, as well as some belemnites and a gastropod from Jeffrey's giveaway box. For my part I offloaded two bins of fossils to Tony for his museum. At the bottom is a fantastic gift from Tim: a Dipleura dekayi hypostome (very uncommon!) and Piochaspis sellata from the Pioche shales of Nevada.
To my good friend Tim who is a fish fossil fan, my only non-trilobite drawing. Knightia eocaena.
Day 3: Penn Dixie Again
Initially, Jay and I had plans to collect a few hours in Dunkirk where it is rumoured that Dunkleosteus pieces could be found, and a generous offer to go through some Linton coal in search of Pennsylvanian aged fish and amphibians. Things didn't work out that way, and I was kind of itching to find more trilobites at the first spot we were working on the Friday. This time, the dig was not curtailed by weather: it finally got warm and sunny. I spent 12 hours hammering and slabbing.
This is the only site pic I took, and this is a "before" image at 7 am. The chunks of rock in the foreground need to be broken down, and the area around my bucket and pry bar is the bench. By 7 pm, all of that area was cleared out.
As the day progressed, the trilobites were thinning out. I made my last significant find around 3 pm, after which it was mostly coral/brach assemblages in very tough, trashy matrix that would shatter rather than split.
Not much to write home about. This is actually a small haul compared to my usual 50-100 bugs per trip, but the pulse was pinching out and the site's excavated areas may not be ideal for trilobites this year. Still, some interesting pieces to prep.
And speaking of which, I've already thrown one into the lab to give my new tools something gainful to do. The initial field state was only showing the thorax. I used the ME-9100 to remove a lot of the excess rock, the Aro for detailing around the bug, the Paasche for abrasion, and decided to pedestal this. Matrix work was mostly filing and sanding. This kind of matrix preparation is not everyone's cup of tea, but these are common bugs and I wanted to play around with some presentation experiments.
And that's it. Not sure where/when the next trip will be given the sad shrinking of viable or accessible sites in Ontario. But I'll find a way...
Snow-free until January 10, and then it clobbered us. More time spent indoors and thinking that it will take a while for this snow accumulation to melt and get the collecting season back into gear. So that leaves prep and postal formation.
This is a return engagement with a bug I started a few months ago. It is a giant for the location (Penn Dixie) that measures over 45 mm from genal to folded over genal. What is not shown in this image is the folded over/under side that took a ridiculous number of hours. I also took the time to level and smooth the matrix -- something I am learning to get better at, and which also takes a lot of time and patience.
A very lovely full prone Scabriscutellum furciferum from Morocco.
The seller was also kind to add an unexpected brachiopod surprise to perk the package.
My 100th trilobite species! Asaphellus fezouataensis from a really nice seller who also threw in a little enrolled phacopid.
Still trying to relearn my old drawing skills that have been neglected for nearly 20 years, a pencil rendering of an Isotelus.
A Greenops widderensis...
And an Eldredgeops rana with all the crush/distortion flaws.
So, for now, that's about it. I'm somewhat running out of trilobites to prep, and only expecting one or two bugs in the mail. I really hope winter won't be too long!
A belated birthday gift, but only by a day. Had the rock cut and away I went to prepare one of Deb's most prized finds.
From the field to the final product.
Over the weekend, I was trying to prepare an Eldredgeops rana roller so that it would be nicely presented in pedestal fashion (just to get some practice with that approach). The roller itself was flawless with no cracks from crush damage, and fully inflated. It was going very well until it popped off the last remaining bit of rock that had been holding it in place, and... rolled away. Cleaning out my entire prep area did not result in me finding it, so it has likely been absconded by the same little demons who steal socks from the dryer. Six hours of work gone.
So a few days later I decided to prep my way through that disappointment in completing a trilobite I had prepared before, but not to the full extent. This is another Eldredgeops rana from the Penn Dixie site, and measures on the upper end of the size they appear at this site.
Before and after. I had prepared this halfway months ago, but it still needed more work. When I initially found it, the rock had split right through it, resulting in the loss of some segments. I glued it together in the field. In this round of prep, I applied acetone to get rid of some excess glue, performed some restoration of the missing parts, scribed and abraded a bit more, and this is the result. It may not be perfect, but it is a lot better than how I found it! This one measures 47 mm (sag.).
My next task is to complete prep on one of Deb's finds -- another prone E. rana.
Before my teaching duties resume tomorrow, I was able to squeeze a few more preps in the last couple of days. Nothing significant, but certainly learning moments for me as I better refine my nascent skills.
Already, I can count a few preparation bouts that turned out fairly well: an Illaenus sinuatus, Asaphus lepidurus, Flexicalymene croneisi, and the Flexicalymene senaria / Fusispira nobilis association. So far, so good, and it seems the normal state of things is to be covered in a fine coating of dolomite!
I probed other finds as well to see if there were other things there, and even popped out a headless Thaleops sp. from Bowmanville. Working with sometimes less than ideal equipment can be its own challenge, but I manage. There are still inefficiencies in my preparation "style" whereby it will take me twice or three times as long to complete a specimen than it would a more seasoned professional preparator with a wider array of tools.
So my task queue has been shortening, but by no means at the point where the lab will be going idle for the rest of winter. My next task was to "fill in a gap" in my "prepertoire": restoration. My first attempt was a mixed result on an Isotelus "mafritzae" back in November that has since been finished but I have been remiss in posting said result. This second attempt would be making use of Milliput again, but on a smaller and more expendable trilobite, the commonly found Eldredgeops rana from Penn Dixie. I've got loads of these in just about every orientation.
This bug was never going to make the cover of Trilobite Vogue. It is twisted with tons of crush damage to the glabella and the right side. For added "character," it is also missing a lot of shell. For preparators, this would be the kind of example one would find in a box of rejects to be harvested for parts.
At this point, a bit of scribing around and blasting followed by applying a good glob of Milliput. Some carving and let to cure for a day.
And the last two stages of the process. If you're wondering, the genal area of the cephalon is largely tucked underneath at an angle (super fun to prep - not!). As far as a clean restoration attempt, it is a pretty obvious attempt (but in certain lighting conditions it is a bit tougher to tell). In my weak defense, I don't have tiny tools or tiny fingers to do this kind of detail work. What this needs is a a pin-sized sander to grind and smooth down the transition between the restored area and the original shell. The pygidium itself is a real mess. But, hey, this was already consigned to the chuck-it bucket anyway, so may as well take the opportunity to practice on a piece that I could royally botch.
An incomplete Leviceraurus mammilloides that Deb found in October in Bowmanville. I may have screwed up in an earlier scribing attempt, not figuring that the tail spines would be sitting on top of the bug's plane, so all but the stubs vanished. It was already missing the left genal and part of the right genal, as well as the right eye that I could not save from the impression side, sadly. But it looks a lot crisper now that I've taken the matrix down on all sides and cleared up some of the inter-pleural gunk on this "zipper bug."
While I had the compressor running, why not do a quick blast of this long-tipped Mucrospirifer thedforensis? They clean up fairly easily, but are usually just a waste of dolomite and time.
And these are teed up for their time at the bench: four enrolled Greenops widderensis (one almost completely pyritized) that will be no picnic to prep. The goal with these will be to expose the other side and have them appear as if "draped" over the rock. These are incredibly delicate and flaky, so having at least four on hand to get it right is a good thing as I anticipate at least a few catastrophes with these ones!
posting this on the final day of a three day dig at Penn Dixie in Hamburg, NY. Earlier in the week I dug with Fossil Forum friends in the Thedford area, and have been amassing finds over several trips. No pics of those hunts yet, but that will happen once the season is over.
We moved a lot of rock this weekend, and found a lot of trilobites. Pics of those when I get the chance. For now, site pics to show our work.
This shows the state of the dig area cleared out after Friday when I joined the other crazy Canadians. As soon as I got there, the human backhoe that I am went right into ripping out large slabs. The fresh stuff is where the best preserved fossils can be found, as opposed to the stuff that has been left to weather out. We do serious earth moving! The trilobites appear mostly at the Smoke’s Creek layer of the Windom Member, or the bottom 15 cm from the contact with the Bayview, just below the water table.
By the end of Saturday, it was mostly just me and Deb, with Jay popping by. Thanks to him for supplying me with wedges. I carved out the slabs while Deb broke them down. Pictured above is the view from one end of the excavation. I managed to double the area (to the shovel handle in the background). The photo hardly does the size of this much justice.
There are a lot of fossils to photograph (about two 5 gallon buckets so far), giving me a lot of winter prep material. This one above is among the largest Eldredgeops rana trilobites that can be found here. This is going to prep out beautifully. A semi-prone position with pygidium tucked underneath. Rollers are common, but prones are not as frequent. I also found a Bellacartwrightia (looks like a Greenops on steroids) in ventral position. Lots of rollers and prones were found.
Some snaps of me caught by our shutterbugs on the Friday. Top two photos by Monica P., and bottom two by Ken M.
And this is how we left the place on the Sunday. Some serious excavation as about 250 cubic metres of rock were extracted and split.
Several buckets of goodies were collected, and these are a few of the better pieces. These are being kept as-is until winter prep time.
Full prone Eldredgeops rana in an assemblage with partials/moults of similar sized specimens.
Ventral side Bellacartwrightia sp. with doublure and intact left genal spine in evidence. Although a ventral prep is possible, I may stabilize this and prep it dorsally. It is uncertain if this is complete beneath the matrix, or just the cephalon.
Pygidium showing of a Greenops sp. Unclear yet if it continues into the rock, but the presence of thoracic pleurae is a positive sign. Sadly, some of the lappets are missing. These asteropyginae trilobites are far more delicate with thinner cuticle than the Eldredgeops rana, and so are more prone to disarticulation due to hydrodynamic forces
Two prones. The one one the left will be an easy prep. The one on the right was Deb's first in the field repair. She had accidentally flicked off the piece (shown with the whitish residue of cyanoacrylate) and I miraculously pulled it out as the first shard from the muddy, opaque water where it fell! It has not been reattached incorrectly; it has become disarticulated at the fourth pleural segment, possibly on account of compaction (which has also flattened it).
Two semi-prones. The one on the left is missing a bit of the glabella.
Assortment of rollers and semi-prones. Unless the rollers appear as more than one in the matrix, I tend to free them from their shale confines.
Although the split sheared the cuticle, I kept this complete roller on account of the large calcite grains in evidence.
Another full, albeit small, prone to prep. On the right is what remains of the throrax of the rare Bellacartwrightia sp.
In all, not a bad few days, but far from my best haul from this location. Gregarious trilobite assemblages were not much in the offing as we chased through the slabs for pulses in the Smoke's Creek layer of the Windom, coming up with a lot of very dense, blank or mostly coral-littered shale with no apparent bedding planes. Without the latter, it becomes mostly guess-work and luck with the hammer to bash the slabs open at the right spot.
My next post will follow the process of preparing my largest bug from this dig, and then it's off to Bowmanville for the biannual Ordovician quarry visit in search of Isotelus and Ceraurus.
DAY 1: Penn Dixie
Returned Monday evening from four fabulous days swinging hammers, slabbing and splitting in the field. We managed to hit two sites, with plans for a third site falling through due to weather and site conditions.
We left home on the Friday morning to arrive at Penn Dixie, in Hamburg/Blasdell NY (south of Buffalo) by noon time. It was not a public collecting day at the site, but members of the Hamburg Natural History Society are permitted to enter the site.
A group of us digging through some fresh material
Of particular note was just how much PD had changed since last season, and that is due almost entirely to some well-directed excavations at some key spots to reveal more of the Smokes Creek trilobite layer, but also opening up other on-site locations such as the Bayview brach layer and the North Evans limestone. We had the excavator on site for the second day, with the previous day ripping up a new spot in preparation for the annual Dig with the Experts event. We did not touch those piles, and focused on other spots.
I found this piece of Devonian wood, and it is a fairly healthy size for this location.
One of the excavated spots we spent the most time working on was fairly thin on trilobites, which suggests that they appear in deposition pulses on the seabed. There's no way knowing in advance if there will be a lot of trilobites, and so you hope to hit paydirt by attacking the Smokes Creek layer.
A fairly large Goniatite, sadly all busted up.
Later in the day, we migrated to a new gully area where some of our other collectors on the Sunday previous had found a few examples of the rare Bellacartwrightia whiteleyi trilobite. Sadly, that lead dried up and no Bellas were found. For the most part, trilobites were mostly appearing as disarticulated bits and moults, with not much in the way of assemblages or complete prones and rollers.
Full prone, but containing shell on both sides of the rock. This will need to be glued together and prepared.
I did have some luck despite the parsimonious nature of the slabs we were splitting. However, the "trilo-bonanza" was still eluding us all. A little before sunset we decided to leave and check in to our motel, grab some pub food, and rest up for day 2 of our trip.
DAY 2: Deep Springs Road
At around 6 am the next morning, our friend Jay picked us up at the motel to begin our first ever trip to Deep Springs Road in Central NY (Madison Cty). DSR, as it is known, has a shale outcrop that rests at the farthest edge of the Windom Formation, but the fauna is quite different than what is found at Penn Dixie. For example, instead of bountiful Eldredgeops rana, they are much rarer here, and in their place are more Greenops sp. and Dipleura dekayi. Also, the real stunner is the enormous diversity of bivalves and brachiopods. It is also quite abundant in Devonian plant pieces, larger cephalopods, phyllocarids, and other goodies.
Our crew gearing up to work.
We arrived just after 10 am, having gone through the scenic rolling hills and farmlands of Central NY. We were greeted at the site by so many of our Fossil Forum friends, some of whom I got to meet in person for the first time. There was no shortage of fun-loving personalities here, and the amount of camaraderie, sharing, and helpfulness was exceptional.
Jay and me ready to start wrecking it all up to do some serious landscaping.
Within five minutes, I was ready to get to it. In the picture above, that wall behind me would be the first to be ripped out to generate a lot of slabs for splitting. By the end of the day, I would have cleared an area 2 m x 2m x 1.25 m.
This slab simply has to go, 150-200kg or not.
Unlocking fresh stuff requires some slabbing, something I tend to enjoy doing. After some overburden was cleared, it was time to maneuver this one off the ledge. As can be seen above,. the rock is heavier than me as I sit on the pinch-point bar which was bending. Eventually, I was able to work from the left wall, wrestling it out, and driving it with my boots down the hill for others to split.
Group shot. From left to right: Dave, Jay, me, Mike, Tim, Dave 2, Jeffrey, and Leila (who fed us scrumptious homemade cookies).
The weather had been promising to make this trip a real bust, but fortunately we only had some intermittent drizzle, with the rest of the time being clear and not too hot. Everyone came away with lots of interesting finds, and friendships were formed or strengthened in breaking rock together.
Bivalves and gastropods. I'm not really up on the taxa, but these are fairly typical finds for this site.
More neatly ridged bivalves.
Large spiriferid brachiopods are fairly abundant at DSR.
On the left is a nice association piece: a spirifer, a Greenops pygidium, and a Devonochonetes sp. . On the right is a high-spired Glyptotomaria.
A well-preserved Cimitaria recurva.
Deb found this wee Greenops that might be complete once I can remove some matrix. This one is barely a few millimetres long.
As Eldredgeops rana are not common here, I bucketed this roller.
Large cephalons from Dipleura dekayi. Finding them full as opposed to moults and disarticulated bits is an event. I think only one of us found a complete prone that day, while someone else found a complete one with the head disarticulated.
More Dipleura dekayi. I'll need to probe this piece a bit more to see if they might be complete (but I somehow doubt it).
A nautiloid and an ammonoid fragment.
With the collecting day over, it was time for us to get back to the Buffalo area. As is natural for us fossil collectors, we never miss an opportunity if we're collecting together to share some gifts. A massive amount of gift exchanges ensued! I was sure to hand out plenty of goodies from Arkona, as well as whatever Ordovician extras I had lying around. Pictured up here is a lovely Herkimer diamond from Dave. These quartz crystals are quite spectacular, and regularly have inclusions of anthraconite.
Another of Dave's wonderful gifts: an assortment of mostly brachs, bivalves, and gastropods from Cole Hill Road.
The other Dave put out a box for all of us to take whatever we fancied. This is a fern from the St Clair site, a site that is no longer open to public collecting.
Of course, little did I know that Tim remembered that Deb really liked those St Clair ferns, and so she received some pieces as well!
Tim gifted me a plethora of trilobites. Two new species on my list: Crotalochephalina gibbus (the Devonian phacopid from Morocco at the very top), Changaspis elongata (a wee corynexochid from the Cambrian, China), a full Greenops sp. from DSR in case I had no luck, and three nodular Eldredgeia venustus from Bolivia.
And the second bunch from Tim. A large Elrathia kingii with cheeks intact + impression, and the rest are Eldredgeops rana.
And Jay gave me a copy of the reprinted classic, Geology and Palaeontology of Eighteen Mile Creek by Grabau. The taxa listed in this one is pretty much the same as what is found at Penn Dixie, and some of those taxa are now outdated or reassigned. But it is indeed a classic from a real pioneer and giant of palaeontology.
DAY 3 - Penn Dixie
After two days collecting with Fossil Forum friends, it was now time for Deb and me to hit out on our own. Plans to visit another site on Sunday were nixed on account of weather... Yes, it was snowing in the Buffalo area! Deb went shopping in the morning, but by the afternoon the sun was out, so we figured we may as well play at Penn Dixie again. Although it was 10 C, the winds were bitterly cold.
Deb standing in the newly excavated zone we were all working on the Friday.
We decided to make a go of trying to find the elusive trilobite layer. This involved a great deal of hauling out slabs. Again, we treated the piles for the Experts event as off-limits.
The Smokes Creek layer is usually at or below the water table. This is what one of the gully areas looked like before I came in to rip out about 2 m wide of slabs. Sadly, the rock was far too dense, and shattered rather than split. Much of what was coming out was just bits and pieces anyway.
This trio of images shows the process required to access fresh material. As these slabs at the contact layer tend to interlock, it is important to kind the keystone slab to unlock them. In this instance, I've used the chisel to exploit and widen a crack running vertically. This one is tucked under another rock, so I had to use the pry bar to wiggle and jiggle it out. After that, I flip the rock over and scrutinize the underside; if there are trilobites or impressions thereof, I then carefully inspect the mini-domes at the site of extraction. As the water is muddy, this is largely done by touch. After that, it is time to remove another slab or split the ones I have.
Probably my best find of the day. The split runs right through the trilobite, but some crazy glue and prep will make this fairly large one turn out just fine.
This one came with a small price to pay. As I was tossing down a slab, it hit the pick end of my rock hammer, which then came at my face like a bullet. It struck and split my cheek, not far from my eye! It could have used a stitch or two, but I simply clamped it together with a bandaid.
Day 4 - Penn Dixie (Again)
After three days of slabbing, splitting, pounding with sledges, wrestling with pry bars, shovelling tons of overburden, my body just about had it! It was also our departure day, which meant we needed to get back on the road by 2 pm at the latest. So we agreed to inspect the newly excavated Bayview brachiopod area where, last October, we were pulling out buckets of brachs.
This stuff splits fairly easily - sometimes just with your hands. Trilobites like Greenops are much more common here, but the shale is so thin and fragile, and the trilobites usually only come out as disarticulated bits.
Brachiopods come out easily from the shale, if they haven't already weathered out and make for some easy picking. These are from about a minute of searching. Inasmuch as we agreed that we'd just do some light surface collecting, after 20 minutes we were getting bored with the brachs (we still have several hundred of them from October's visit),.so we went exploring back to the trilobite beds in search of a plentiful area.
Going through my splits, Deb finds this beauty.
A spot-check on some nearby rocks indicated that this particular area on the site might prove productive. Pictured here, after I removed the covering slab, is a very large dome. Domes at PD can either be full of trilobites or full of nothing.
Paydirt! We finally found the productive part of the layer. Although none of these are complete, it is strongly indicative of the presence of more assemblages in the depositional environment. Of course, it was almost time for us to leave just when we found the sweet spot. But we did manage to pull out a few rollers and near-completes that I haven't had a chance to photograph yet, but I think I've got the real highlights here in this post anyway.
And so it was back to Canada after a four day adventure. I was beyond sore, of course, but overall it was great to collect with friends old and new, enjoy the outdoors, and come away with treasures found and gifted.
Upcoming digs will likely be in the Arkona/Thedford area, and a trip to Bowmanville at the end of this month. Until then, time to manage some new backlog on the prep bench!
We had started around 4 pm the previous day in "brach city," an area that is close to the small tributary. This is an ideal spot to find a lot of Spinatrypa spinosa, Mucrospirifer audaculus, Athryris sp., Orbiculoiodea sp., Pseudotrypa sp., Rhipodomella sp., and Mediospirifer... The shale here is very crumbly, so these ones pop right out of the matrix. Trilobite pieces can be abundant here, but very rarely complete (comparable to the high energy coral biostrome of the Hungry Hollow member). The Mucrospirifers can be quite fragile and a challenge to find intact, but we got a bunch. We filled a bucket and planned to spend our final half day before leaving just focusing on this area. It is also filled with crinoid stems, bryozoans, occasional pelecypods, and other marine bits.
And thank goodness for easy pickings! My hammering arm was sore and my grip strength felt pretty weak.
A bit of a mucky layer, but you can pick out the shells in these pieces, along with the impression of a Greenops cranidium and an Edredgeops cephalon.
Not the most exciting picture, but it gives insight into what the layer looks like with all the brachiopods just waiting to pop right out.
There are clustered areas in the layer where the bigger shells congregate, and this is one of them.
A sweet and uncommon find in this layer: a full Eldredgeops rana that is very tough to find in these crumbly layers. Pictured on the right is what it looks like after some delicate work with a dental pick.
We filled buckets with brachs. This is just one of them.
We managed to collect about a thousand intact brachs. It will take me some time to clean and sort them all.
A small pile of spirifers (Mucrospirifer and Mediospirifer). For scale, most of these are almost two inches wide.
A small pile of Spinatrypa spinosa. Some can be quite large (about the size of a silver dollar) and came out either thin or plump, single or dual valved.
A small pile of Pseudotrypa sp. They come out either somewhat flattened or very plump, a bit bigger than cherry tomatoes.
Again, hardly representative of all the examples collected of each species, but cleaning and sorting of 1000 brachs will take time! We have here some Athyris sp., Rhipodomella sp., and another species I have to double check.
My next post will be the "aftermath" portion where I actually go through the large number of buckets filled with fossils, and get those to the prep table! Stay tuned...