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Fossil Identification

Part of Trilobite Pygidium or ??

Oohlala   03-09-2019 at 02:32

Junior Member
Registered: 03-09-2019
Messages: 3

I found this while hunting for agates in a quarry in the Driftless region in Wisconsin along the Iowa border. I was thrilled to discover a tiny fossilized leaf but on closer inspection (and other input), I don't believe this to be a leaf.
Please note that there appear to be pores and there is an appearance of something faintly looking like a tail or stem at the bottom of the close-up picture.
I attached the final picture not knowing if other fossil object remnants or not, and if these could give further clues.
Any assistance on identification would be appreciated. Thanks!

Masterofearth   03-09-2019 at 10:55

Senior Member
Registered: 13-10-2015
Messages: 438

I cannot help on an identification but YES this is part of a Trilobite pygidium. Nice find! The marks on the back do not look like anything I know.



Oohlala   04-09-2019 at 03:33

Junior Member
Registered: 03-09-2019
Messages: 3

Thanks a lot, Pim! I honestly don't know what characteristics make this so, as I am a newbie, but I really appreciate your assistance! I plan to learn a bit more about this.

hubertus68   04-09-2019 at 06:30

Senior Member
Photo Moderator
Registered: 12-11-2012
Messages: 2599

Couldn't this be an imprint of some sort of bivalve too?
Do you know something about the stratigraphic origin of the piece?

Best wishes,

Oohlala   04-09-2019 at 12:56

Junior Member
Registered: 03-09-2019
Messages: 3

Hi. It was discovered in a dirty rock pile in a quarry while looking for agates. Sorry. so the region is all I know.

Frederik   10-09-2019 at 10:27

Photo Moderator
Registered: 28-09-2003
Messages: 8635

Without a doubt, this is an imprint of a trilobite tail section. The 'pores' are tubercle imprints. Without stratigraphic context, it is very difficult to ID this specimen.

Try to learn something about everything and everything about
something (TH Huxley)