Spent about four hours today at the new spot I visited yesterday (see that post here). Didn't come away with as much, and mostly the same from yesterday. I didn't take many pictures, but there were more Terataspis grandis pieces to be had, of which I took a good many. It certainly isn't easy to find the right rock, and even less easy to break them. Hands on learning was also had as a sharp edge of chert went right through my glove and left a deep bleeding gash in my finger. Now I know from direct experience why chert was the material of choice among prehistoric hunters!
So, just one highlight:
Just slightly covered in matrix, and with the impression, the hypostome of a Terataspis. I'll need to do some light repair as two pieces broke off while trying to extract it from a much larger rock. That's what glue is for! It's not very large and impressive for the species -- about the size of a thumbprint; the specimen at the ROM is about 7 cm wide.
I have digital versions of this one, and it is free to download online, too. However, there is something to be said about having a physical copy. It wasn't cheap, but nowhere near for as much as I've seen these go for online. This is the classic green trilobite bible, and in pretty good shape.
It is supposed to rain for the next two days (it is still spring, after all), so any fossil activity will likely be lab prep stuff. Saturday is looking like a sunny stunner, so perhaps another outing. It's been 66 days since my season started, of which I've spent 22 out in the field. In that time I've bagged representatives of 15 trilobites, with at least one undescribed species and a boatload of Terataspis parts.
So I've returned numerous times to my new spot, but have not had the same level of success as my first two outings. I now have a ludicrous amount of Crassiproetus pygidia, but nothing complete and not even a whisper of another Terataspis. If all this material is indeed Bois Blanc Formation, I do find it curious that I haven't yet encountered even a tiny fragment of the dalmanitid Anchiopsis anchiops, which is fairly abundant in that formation. That may be attributable to the specific paleoenvironment in which these were deposited, just as one may encounter trout in one part of a river, but not in a smaller river nearby.
I've been able to identify six distinct types of rock at the site, with only one of those being trilobite bearing. I'll be giving the spot a bit of a rest for the time being while I focus on other projects (and get back to teaching).
I've two illustrations -- one complete, and the other in process -- that I can reveal in the next while. For now, I want to discuss this:
Seasoned trilobite collectors in Ontario are very familiar with this text, a veritable bible put together by the masterful Rolf Ludvigsen who passed away in December, 2016. He was an intellectual giant, a taskmaster, and an exacting top tier scholar. This book was published in 1979, and a lot has changed in Ontario trilobite knowledge since then: the genus Phacops in North America was reassigned to Eldredgeops, the great Bill Hessin formally described the cheirurid Leviceraurus mammiloides, Lieberman and Kloc reassigned Neometacanthus to Bellacartwrightia jennyae, and even humble amateurs like myself have put in tireless efforts in finding some trilobites that haven't been reported in over a century.
The state of fossil collecting in Ontario is mixed. With more site closures, places getting tapped out, suburban sprawl, areas now under provincial park designation, and other issues all too common in many parts of the world, the halcyon days are certainly over. Of course, the undaunted die-hards like myself will continue trying to locate new spots, to dig deeper and farther in unlikely locations, even if they are small and quickly exhausted.
I do think it is time to honour Ludvigsen's project in revising this text. Of course, that is a matter of expertise, time, and money. There is not a tremendous amount of research interest in such a niche project. That being said, some small and remarkable steps have already been taken. For example, Philip Isotalo's book on Ordovician trilobites of Ontario is exactly the kind of enterprise that we need more of. Bill Hessin's invaluable field guide to southern Ontario fossils has also quickly become a kind of bible for collectors in the GTA and surrounds.
There is still so much more work to do, and sometimes I regret not specializing in this field when I entered university. We still do not have a formal description of the Cobourg Fm Isotelus "mafritzae", which should be a top priority housekeeping item.
I can only do so much on my own given my limitations. I'm not a paleontologist, I do not have access to the granting structure. What I do have is the passion and energy. If someone reached out to me and asked if I wanted to play even a tiny role in revising Ludvigsen's text, I would very much take to it like a duck to water.
So, to that end, I've been combing through the literature to create a kind of "master list" of Devonian bugs in Ontario. There are plenty of known unknowns. There are species that should technically be found here by stratigraphic correlation, but have not been confirmed. I'm providing my list, a work in progress. I've been fortunate (and stubborn enough) to find examples of 15 of the roughly 25 species found in Ontario. If you are a trilobite worker in Ontario reading this, I'm more than willing to put in the work needed to revise the Ludvigsen text. We've already seen the resurrection of another of Rolf's projects courtesy of Fred Sundberg in the form of the rebooted Trilobite Papers.
It is a major ask for a major task, especially when we have yet to even see the second volume of the Treatise! But there are so many tireless trilobite workers out there today whose efforts are on par with the greats of yesteryear, such as Jonathan Adrain, Gerd Geyer, Richard Fortey, Joan Corbacho, Gerald Kloc -- just to name a few.
So here is my list so far. My thanks to the indefatigable efforts of Scott Morrison as the true trilo-lit archivist par excellence for putting key documents in my hand. I hope this list assists our collectors -- professional and avocational.
Pseudodechenella ?rowi / ?arkonensis
Widder (Hungry Hollow)
Eldredgeops iowensis southworthi
Crassiproetus sibleyensis* (corr. Michigan)
Pseudodechenella nodosa* (corr. Ohio)
Odontocephalus selenurus (?)
Coniproetus folliceps (corr. NY)