It does look a lot like coral. Some of the structures have polygonal boundaries like colonial coral. But if it really is sandstone that is a problem because the corals are made of calcium carbonate (as in limestone). Might be good to take some dilute acid to drop on it and see if it fizzes - or better yet take a fragment and look closely at the structure under a magnifying glass. If it is sandstone it will be gritty all the way through, but coral would show some structure under a close- inspection.
---In geology2@yahoogroups.com, <linkerns@...> wrote:
Well, I have experience in invertebrate fossils and that looks like coral to me. I've found some of it near Coon
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