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Maquoketa mysteries


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These two finds are stumping me a bit. Both are from the Maquoketa Fm (Upper Ordovician) of Iowa. The first one initially struck me as a 3D graptolite, but it could be a crinoid stem. I couldn't get a good photo of the cross section, but it is rectangular.



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The second find, well, I have no idea.:headscratch:Not sure if it's even a fossil.




Thanks for any help.

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I think the first one contains a crinoid stem, they seem to be common in your area. The second fossil might be a coral of some sort, but I am unsure.

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Looks like a possible sponge:mail?url=http%3A%2F%2Fmail.yimg.com%2Fok%2Fu%2Fassets%2Fimg%2Femoticons%2Femo71.gif&t=1598556557&ymreqid=23281213-8dc1-3cff-1cee-44000401aa00&sig=SmrSYnpjG7Y3G7_JUoNu1A--~D




Rigby, J.K., Bayer, T.N. 1971. Sponges of the Ordovician Maquoketa Formation in Minnesota and Iowa. Journal of Paleontology, 45(4):608-627

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