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I found this weird fossil rock and I am wondering if anybody could help identify what could have made the imprint in it or what kind of rock it is?

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Looks like a sand dollar fossil. Note the pentagonal shape in the middle.

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Source: fossilera.com

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  • $\begingroup$ I think you might be right, that is so cool! I did not think I could find sand dollars so far inland. Thank you for you help! :) $\endgroup$ – Crozier Sep 2 '18 at 21:45
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    $\begingroup$ @Crozier inland today is not necessarily were the ocean was in the past. I have worked fossil seaway deposits in Colorado which is about as far inland as you can get today. $\endgroup$ – John Sep 3 '18 at 0:00
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    $\begingroup$ @Crozier the top of mount Everest is fossil-bearing limestone $\endgroup$ – Gimelist Sep 3 '18 at 1:44
  • $\begingroup$ That is pretty interesting! Thanks for sharing @John and Gimelist :) $\endgroup$ – Crozier Sep 3 '18 at 3:12
  • $\begingroup$ @Crozier the western interior seaway is kinda cool, its one of the largest marine deposits on dry land. $\endgroup$ – John Sep 3 '18 at 13:58
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I found out today that this strange "fossil rock" is actually a sea biscuit (common name) in the class echinoidea. Sand dollars are flat, but the sea biscuits are "puffy". I found this out in my zoology class!

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