Monica Posted July 24, 2019 Share Posted July 24, 2019 Hello everyone! On Monday, I found a beautiful Treptoceras crebriseptum orthoconic nautiloid in a huge rock at Mimico Creek in the Etobicoke/Toronto area (Georgian Bay Formation, Upper Ordovician). It has been suggested that I might have a complete specimen, so I was hoping that someone out there might be able to let me know if this is the case or not. Here are some pictures... Whole specimen: Close-up of the base of the specimen (specimen has been turned over) - note that it is smoothly rounded and shows no septa - is this the fossilized living chamber of the animal? Close up of the tip of the specimen - note that it seems to end before the rock edge - is this the very tip of the animal? Close up of the piece that shattered off the tip of the specimen - note that it also seems to end before the rock edge: Thanks for your help!!! Monica 2 Link to comment Share on other sites More sharing options...
Fossildude19 Posted July 24, 2019 Share Posted July 24, 2019 Cropped, rotated, brightened, and enlarged. 1 Tim - VETERAN SHALE SPLITTER VFOTM --- APRIL - 2015 __________________________________________________ "In every walk with nature one receives far more than he seeks." John Muir ~ ~ ~ ~ ><))))( *> About Me Link to comment Share on other sites More sharing options...
FossilDAWG Posted July 24, 2019 Share Posted July 24, 2019 I would say it is essentially complete. However, it seems to be missing the tip. This might have happened while the animal was still alive, but at any rate it is fragile and so the tip of the shell is often missing. Don 1 Link to comment Share on other sites More sharing options...
Monica Posted July 24, 2019 Author Share Posted July 24, 2019 23 minutes ago, FossilDAWG said: I would say it is essentially complete. However, it seems to be missing the tip. This might have happened while the animal was still alive, but at any rate it is fragile and so the tip of the shell is often missing. Don Thanks, Don! Link to comment Share on other sites More sharing options...
TqB Posted July 25, 2019 Share Posted July 25, 2019 Great specimen! I agree with Don about the tip - it may just be fragility but a lot of nautiloids were deciduous, shedding their earlier stages as a matter of course. 3 Tarquin Link to comment Share on other sites More sharing options...
Monica Posted July 25, 2019 Author Share Posted July 25, 2019 18 minutes ago, TqB said: Great specimen! I agree with Don about the tip - it may just be fragility but a lot of nautiloids were deciduous, shedding their earlier stages as a matter of course. Thanks for the added information, Tarquin! Link to comment Share on other sites More sharing options...
howard_l Posted July 27, 2019 Share Posted July 27, 2019 I think there would be more of the living chamber there but most of it looks there. 1 Howard_L http://triloman.wix.com/kentucky-fossils Link to comment Share on other sites More sharing options...
Monica Posted July 28, 2019 Author Share Posted July 28, 2019 12 hours ago, howard_l said: I think there would be more of the living chamber there but most of it looks there. Thanks for chiming in! I've passed this specimen on to a friend who can prepare it properly - I'll post pictures of it when it's done 1 Link to comment Share on other sites More sharing options...
Mark Kmiecik Posted July 28, 2019 Share Posted July 28, 2019 Is this orthoconic nautiloid complete? Needs a rear deck and a swimming pool. 1 Mark. Fossil hunting is easy -- they don't run away when you shoot at them! Link to comment Share on other sites More sharing options...
JUAN EMMANUEL Posted July 31, 2019 Share Posted July 31, 2019 I recall reading from the book Stratigraphy and Paleontology of Toronto and Vicinity that the body chamber of Treptoceras crebiseptum occupies at least 25% of the animal. 1 Link to comment Share on other sites More sharing options...
Monica Posted July 31, 2019 Author Share Posted July 31, 2019 1 hour ago, JUAN EMMANUEL said: I recall reading from the book Stratigraphy and Paleontology of Toronto and Vicinity that the body chamber of Treptoceras crebiseptum occupies at least 25% of the animal. Thanks for the interesting fact - we'll see what it measures when it's cleaned up... Link to comment Share on other sites More sharing options...
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