Mediospirifer audaculus is a very common brachiopod from the middle Devonian and I've found it at the
Penn Dixie site, in the
Silica shale formation, the
Centerfield mbr. of the Ludlowville formation, the
Hungry Hollow mbr. of the Widder formation, and the
Mahantango formation. Below are a couple of specimens that come from the Windom shale mbr. of the Moscow formation at Deep Springs Rd., NY.
Specimen #1 - has a flattened (crushed) brachial valve
Anterior
Pedicle valve
Posterior
Left profile - Here you can see that the pedicle valve is in good condition but the brachial valve has been crushed. Normally the brachial valve in a
M. audaculus should be flat to slightly convex.
This is a chunk of rock from the Deep Springs Rd. site that has multiple impression and valves of
M. audaculus. I have to wonder if this is the remains of a small colony that was swept up in a storm or just a grouping of shells that were winnowed by currents.
This specimen was found at a borrow pit on Deep Springs Road in Madison County, NY which exposes the Windom shale member of
the Moscow formation (middle Devonian in age, Givetian stage.)
No comments:
Post a Comment