Klaus_Grizwold Posted Friday at 10:32 PM Share Posted Friday at 10:32 PM This is part of a Triceratops frill that my dad and I found in the hell creek formation of North Dakota. My question is, there seems to be scoria on one face of most of the pieces. I have personally not seen this before, and I am curious of the geologic setting that this would occur. Link to comment Share on other sites More sharing options...
ThePhysicist Posted Saturday at 04:13 AM Share Posted Saturday at 04:13 AM (edited) Scoria is igneous, so it won't be associated with a fossil. The dark stone plastered on there is ironstone. Sometimes it can appear porous, due to the decay and erosion of organic materials caught within it as it formed. Ironstone generally forms in wet environments in reducing conditions. In the context of HCF, this typically means in river channel sediments surrounding organic matter. Edited Saturday at 04:16 AM by ThePhysicist 1 Forever a student of Nature Link to comment Share on other sites More sharing options...
Klaus_Grizwold Posted Saturday at 02:25 PM Author Share Posted Saturday at 02:25 PM @ThePhysicist That would make sense from HCF. Also, looking closer at the Ironstone, there are little impressions of organic materials like wood and sticks, see added pictures. I very much appreciate your help. 1 Link to comment Share on other sites More sharing options...
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