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On a recent visit to Key West, Florida I found this imprint in a rock along the shore. This was a piece of rip rap, so its original location is unknown but I believe most of the fill and rubble in the area was sourced fairly locally (South Florida). The bedrock at this location is the Pleistocene aged Miami Limestone, which is from the Wisconsinan to Sangamonian stages (<700,000 years) but even in all of southernmost Florida (say Miami and south) the oldest you get is Pliocene. So, while I don't know the exact age, I'm pretty confidant it is fairly young. The imprint is about 5cm wide by 9 cm long. Hard to tell in the picture perhaps, but it is probably 3-4 cm deep. In the picture on the left, you see the whole rock, including the other bivalve casts etc in there. Looks pretty typical for what I saw in the limestones of that area. The picture on the right is the impression enlarged. I did not bring it home with me, so this is the best I can do with pictures. My first impression was it looked like the impression of an ammonite septal wall, but of course it is much to young for that. Only other thing I can think of is the impression of the top of some type of coral, maybe a brain coral, but I'm struggling to visualize it as it looks too symmetrical for that. The detail is pretty neat. Anyone recognize this? @digit @hemipristis @Harry Pristis

My wife found this on the beach near Casa Caselles in Key West 12/23/23. Your thoughts. Thank you.

Any help with these would be much appreciated. I found them on the South side of Key West Island, Fl.

I was in Key West about a month ago during some pretty strong winds. Tons of coral had washed up on the beach, much of which was crystalized. I am curious if the process of it forming the crystals is similar to the agatized coral that you find in the Tampa area (like in the first picture)? I have a little of that from a trip to Tampa a year ago but can't find any information about crystalized coral in the Keys. Most of the coral in the bowl pictured is crystalized but it is difficult to see the crystals so I took some close ups with the microscope. Any help would be appreciated! Thank you! Kelley