connorp Posted November 20, 2019 Posted November 20, 2019 Here are a few fossils I recently collected from the Maquoketa Group (Upper Ordovician) in northern Illinois that I'm not sure about. 1) Maybe some kind of trace fossil? 2) The two things in question here are to the left and right of the pentagonal crinoid columnal. The small fossil on the left looks like it might be part of a trilobite genal spine? And the three-pointed fossil to the bottom right I have no idea about. I feel like I've seen something similar before but can't remember.
connorp Posted November 20, 2019 Author Posted November 20, 2019 3) This looks like a brachiopod or bivalve fragment. My best guess is a partial shell of the bivalve Ambonychia.
Tidgy's Dad Posted November 20, 2019 Posted November 20, 2019 1) Agree - trace fossil - burrows of some sort. 2) Genal spine piece and bryozoan. 3) Orthid brachiopod fragment. 3 Life's Good! Tortoise Friend.
Rockwood Posted November 20, 2019 Posted November 20, 2019 The little y shape bryozoan ? Aulopora is listed as from the upper Ordovician. It looks more something like that to me. 3
TqB Posted November 20, 2019 Posted November 20, 2019 58 minutes ago, Rockwood said: The little y shape bryozoan ? Aulopora is listed as from the upper Ordovician. It looks more something like that to me. I agree. 1 Tarquin
Tidgy's Dad Posted November 20, 2019 Posted November 20, 2019 2 hours ago, Rockwood said: The little y shape bryozoan ? Aulopora is listed as from the upper Ordovician. It looks more something like that to me. Could be. 1 Life's Good! Tortoise Friend.
Rockwood Posted November 20, 2019 Posted November 20, 2019 Neat little PacMan crinoid pinules there too. 2
Shamalama Posted November 20, 2019 Posted November 20, 2019 Yes, I agree with @Rockwood. The "Pac-Man" looking fossils are possibly from the arms of a Crinoid. 1 -Dave __________________________________________________ Geologists on the whole are inconsistent drivers. When a roadcut presents itself, they tend to lurch and weave. To them, the roadcut is a portal, a fragment of a regional story, a proscenium arch that leads their imaginations into the earth and through the surrounding terrain. - John McPheeIf I'm going to drive safely, I can't do geology. - John McPheeCheck out my Blog for more fossils I've found: http://viewsofthemahantango.blogspot.com/
connorp Posted November 20, 2019 Author Posted November 20, 2019 10 hours ago, Tidgy's Dad said: 1) Agree - trace fossil - burrows of some sort. 2) Genal spine piece and bryozoan. 3) Orthid brachiopod fragment. Orthid brachiopod looks like a good match. As for the genal spine, best guess would be Isotelus? Not seeing another good match on the Dry Dredgers ID page. 1
Tidgy's Dad Posted November 20, 2019 Posted November 20, 2019 14 minutes ago, connorp said: Orthid brachiopod looks like a good match. As for the genal spine, best guess would be Isotelus? Not seeing another good match on the Dry Dredgers ID page. Not sure. I've just spent a couple of weeks trying to id trilobits from the Lawrenceburg road cut, Upper Ordovician and had precisely no luck at all. 1 Life's Good! Tortoise Friend.
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