Found this in one of my arrowhead creeks a few yrs. ago and really don't know what it is. One friend said it was a hunk of tree bark ,another said it was fossilized mud. It looks like a fossil algie patch to me but really dont know. The layer of what ever has some depth to it, probably 1/32" deep and the layer it's on is about 1/2" before it turns to regular rock. Just don't know. This it from SE IA.
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Down in Arkansas there is a geologic formation called Carpet rocks. That looks similar on a smaller scale. http://www.encyclopediaofarkansas.ne...x?mediaID=7875TN formerly CT Visit our store http://stores.arrowheads.com/store.p...m-Trading-Post
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