Tuesday, March 31, 2020

Devonochonetes scitulus brachiopod from the Moscow formation

In a previous post I wrote about specimens of Devonochonetes scitulus that I'd found with spines still present. The spine positions, angles, and number are the best way to differentiate between species of Devonochonetes. The previous specimens came from the Ludlowville formation and below is a specimen from the Moscow formation at the Deep Springs Rd. borrow pit. The Ludlowville underlies the Moscow formation and so is contemporaneous which means it is not unexpected to find this species at this location.

Specimen #1

Specimen #2

Here is a specimen that shows the interior of the brachial valve. The oval shapes visible are the muscle scars where the brachials would have been attached. As the brachials were not mineralized in this species, only the marks on the shell where they used to be are preserved.

These specimens were 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.)

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