PetrifiedDoubleGulp Posted August 1, 2023 Share Posted August 1, 2023 I encounter this one a lot in sediments from the Calvert Formation. This test batch is from a mudstone, broken up and reduced through no. 20 and no.120 testing sieves. The close up is using a 40/0.65 lens 1 Link to comment Share on other sites More sharing options...
Al Dente Posted August 1, 2023 Share Posted August 1, 2023 Looks like a spine from an irregular echinoid. 1 1 Link to comment Share on other sites More sharing options...
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