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Showing results for tags 'plain rock'.
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I found this along the Mississippi River at Alton IL, but it was in an area that's been extensively modified by dumping dredged rock and sand out of the barge channel onto the banks, which means it could be anything from any period. I've walked those banks for many years and occasionally found rounded black things with a cellular-looking pattern caused by shrinkage of the outer layer, but they're generally fairly soft and this is hard as, well, rock. Is that all it is, or could it be some kind of fossil? I've never found any kind of fossil there, so I have doubts. Mostly the fossils are from the Ordovician, and miles further north or southwest in different types of formations, but as I say this likely came from dredging in the river so it could have been washed down from anyplace upstream, which covers a lot of territory. So, rock or fossil?
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