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Showing results for tags 'dakotas'.
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Agate vs Chert as I understand- Agate is volcanic and Chert is biogenic, marine in origin, but not fossil- chalcedony refers to volcanic but there are a lot of names tossed around for microcrystalline quartz My guess is that this is folded Chert, marine in origin It has a tiny cavity at the end which might be 'geodish' Photos from cut surface, both ends and the side the cut surface is 6 cm wide and 4 cm tall I don't recall where this was found- I think W. N Dak Does anyone have illuminating comments on this subject-
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- dakotas
- microcrystalline quartz
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A co-worker just handed me this bone and picture. Wanted to know about it. Found in North Dakota. Thanks! *more info, from western N Dakota Hell Creek formation. Skull around 3 feet