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Posted in response to Re: Re: Ok, just let your imagination roll with it. from Ward on September 11, 2010 at 09:21:38:

Re: Re: Re: Ok, just let your imagination roll with it.

Most of the many fossil sponges I've seen are roundish blobs without much internal structure. The supporting spicules fossilize well but are microscopic. Hard corals have a substantial calcium carbonate structure, with each animal in the colony inhabiting a separate tubular chamber. These tubes are usually hexagonal or squarish in cross section and often have rib-like internal partial walls or septae. Your specimen appears to have this type structure, sawn subparallel to the tubes. There are a couple of other less likely possibilities, but I'm betting on coral. Corals fossilize much better than sponges, i.e. the recent Indonesian material, Petosky stones, etc.

From MikeR - September 14, 2010 at 10:48:47
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