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A couple days ago I spent the day at the Gay Head Cliffs at Martha’s Vineyard. This beach is famous for its vibrantly colored clay cliffs. I did not fossil hunt in the cliffs themselves because as far as I’m concerned it’s a federal offense to even touch the cliffs, but I did find a couple of clams lying along the surf that had eroded out of the cliffs. They’re pretty neat because they’re the first Miocene fossils I’ve ever found. I was hoping to find shark teeth because I had heard they could be found there but at least I found some fossils.
About 3"X2"X1.25" Found in a friend's yard, a friend who collects fossils. He doesn't remember where he got it. But it is most likely from the Miocene Greeensands of the Gay Head Cliffs, and represents some bone of a marine mammal. The end is extremely smooth and shiny, looks a lot like a bone. It is a heavy chunk of rock. A seal bone? Small whale? This 1934 study is the best reference that I've found for the 100-million year old geology of the Gay Head Cliffs where bones of a camel and a horse were found in a glacial era deposit, and many marine fossils have been found in the greensands. https://archive.org/stream/mobot31753003559371/mobot31753003559371_djvu.txt