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Patrick Hsieh posted a new activity comment 1 day, 3 hours ago
1 day, 3 hours ago1 day, 3 hours agoIts definitely an echinoid (class Echinoidea). Sand dollar (order Clypeasteroida) is a reasonable guess.
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Patrick Hsieh posted a new activity comment 1 week, 2 days ago
1 week, 2 days ago1 week, 2 days agoInternal mold of a bivalve.
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Patrick Hsieh posted a new activity comment 1 week, 6 days ago
1 week, 6 days ago1 week, 6 days agoThanks for the additional pictures. I no longer believe that is a cephalopod. That is a Gryphaea oyster, also known as devil’s toenails.
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Patrick Hsieh posted a new activity comment 2 weeks ago
2 weeks ago2 weeks agoProbably part of a broken brachiopod shell. I say that because the center raised ridge looks like the fold, which corresponds to the sulcus in the opposite valve or the corresponding shell. A scale and views of the back and sides may help confirm that.
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Patrick Hsieh posted a new activity comment 2 weeks ago
2 weeks ago2 weeks agoMost likely a cephalopod such as a nautiloid or ammonoid. A scale such as a ruler and different views such as from the side is helpful.
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Patrick Hsieh posted a new activity comment 2 weeks, 1 day ago
2 weeks, 1 day ago2 weeks, 1 day agoI’m fairly confident that is a brachiopod. Do you have a locality where it was found?
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Patrick Hsieh posted a new activity comment 3 weeks ago
3 weeks ago3 weeks agoI would hazard Cosmopolitodus planus (Agassiz, 1856), but a locality where this came from is always helpful.
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Patrick Hsieh posted a new activity comment 1 month ago
1 month ago1 month agointernal mold of a bivalve or a brachiopod.
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Patrick Hsieh posted a new activity comment 1 month ago
1 month ago1 month agoSome of the larger pieces on the bottom look like oyster shells.
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Patrick Hsieh posted a new activity comment 1 month, 3 weeks ago
1 month, 3 weeks ago1 month, 3 weeks agoCompare with an internet search for “deer hoof core”
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Patrick Hsieh posted a new activity comment 2 months ago
2 months ago2 months agoI would say it depends on how you found it. If you found it on the ground surface, it could have been transported there through many ways: broke off an outcrop and rolled down hill, broke off and was transported by a creek or river, or it was transported there by humans. In those cases, we don’t know exactly where it came from. If you don’t know…[Read more]
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Patrick Hsieh posted a new activity comment 2 months ago
2 months ago2 months agoFlexicalymene ouzregui Destombes, 1966
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Patrick Hsieh posted a new activity comment 2 months, 1 week ago
2 months, 1 week ago2 months, 1 week agoI concur with @corinne-daycross. I would go further and say this is Knightia eocaena Jordan, 1907. There are 2 species of Knightia commonly found in the Green River Formation of Wyoming. K. eocaena and K. alta. K. alta has a deeper belly.
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Patrick Hsieh posted a new activity comment 2 months, 1 week ago
2 months, 1 week ago2 months, 1 week agoBased on your location, it looks like the bedrock has been mapped to the Silurian Period. Orthocones, which are cephalopods, are consistent with that. You can check out this website for more information: https://silurian-reef.fieldmuseum.org/narrative/429
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Patrick Hsieh posted a new activity comment 2 months, 1 week ago
2 months, 1 week ago2 months, 1 week agoMy first impression is orthocone as @a-trilobite suggested. Locality info is always helpful (state, nearest city or town, and the name of the pond if you have it).
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Patrick Hsieh posted a new activity comment 2 months, 1 week ago
2 months, 1 week ago2 months, 1 week ago@kara-freeman, @daniel-gonzalez This is a murex shell that has been weathered so that parts of it have broken off.
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Patrick Hsieh posted a new activity comment 2 months, 2 weeks ago
2 months, 2 weeks ago2 months, 2 weeks agoNot a mollusc, this is a decapod of the genus Thalassina.
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Patrick Hsieh posted a new activity comment 2 months, 2 weeks ago
2 months, 2 weeks ago2 months, 2 weeks agoWhere was it found? I can’t stress enough how important the locality context is.
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