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Bits and pieces of a smothered bed, known to Middle Devonian collectors of Western New York as the ‘third Pleurodictyum bed’ described by Amadeus Grabau as a locator for the large nautilus fossils in that strata. (Used to be Nautilus magister) Pleurodictyum americanum and Aulopora sp. dominate the specimen which is about 24” in diameter. (A nice garden rock that travels with me). The brown spots aren’t dirt. They are most likely degrading iron/iron pyrite deposits from decomposing organics in an anaerobic environment.
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I found this quite a challenge.

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