BenWorrell Posted April 10, 2020 Share Posted April 10, 2020 ID help please! I recently found these strange features in a Devonian rock in Johnson County, Iowa. They are unusual looking enough that I suspect an animal may have been involved in their formation. My first guess was that they were burrows that had filled in with dense crinoid and shell debris, but I'm not sure how that would happen. My second guess was that it could be poop/coprolite from a fish or some other Devonian creature. I didn't have a scale with me, but these would be very large for fish poop. I will post another photo in a separate post below (files are too big). I would be very grateful for any assistance, thank you! Here is a link to a video that may also be helpful: Link to comment Share on other sites More sharing options...
BenWorrell Posted April 11, 2020 Author Share Posted April 11, 2020 Here's a close-up photo Link to comment Share on other sites More sharing options...
minnbuckeye Posted April 11, 2020 Share Posted April 11, 2020 Interesting! I lean towards infilled burrow tubes, but take my thoughts with a grain of salt. Mike 1 Link to comment Share on other sites More sharing options...
BenWorrell Posted April 11, 2020 Author Share Posted April 11, 2020 1 minute ago, minnbuckeye said: Interesting! I lean towards infilled burrow tubes, but take my thoughts with a grain of salt. Mike Thanks for the input Mike. Any idea what sort of creatures made burrows in the Devonian? Maybe trilobites or something? Link to comment Share on other sites More sharing options...
Rockwood Posted April 11, 2020 Share Posted April 11, 2020 I'm not sure it qualifies as poop, but maybe processed sediment ? Imagine something like a sea cucumber ingesting crinoid mush and expelling the inedible. 2 Link to comment Share on other sites More sharing options...
Norki Posted April 11, 2020 Share Posted April 11, 2020 Maybe rip-up clasts? They look like they could be storm-tossed chunks of clay that resettled into new sediments. 2 Link to comment Share on other sites More sharing options...
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