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Modiomorpha and Grammysioidea pelecypods from the Moscow formation
Here are another group of bivalve fossils that I found at the Deep Springs Rd. Quarry in Madison County, NY. The rock exposed at the quarry is the Moscow formation (Devonian, Givetian stage).
The first fossil is a right valve from a
showing the typical elongated oval shape with fine concentric growth lines on the surface of the shell.
This species is somewhat common and I've blogged about them being found in the Mahantango Formation Here and Here.
The next shell is squished horizontally so it's hard for me to ID for sure. The thick, wavy concentric folds on the surface (which do not represent individual growth lines) could be from two closely related species:
. Both look overall the same but
has a "belt" that runs from the beak of the shell across the folds down to the margin where the valves meet while
Right now I'm leaning towards
since I can't see a recognizable "belt".
As further illustration of this species, here is a different specimen that I found on the same trip. This one has been compressed flat but at least one of the valves (the right valve) is intact.
I have collected
before from the Moscow formation and also the Mahantango formation.