Megastrophia Concava

[Brewcuse]

I found this guy in a lump of Tully limestone that had broken and weathered out… the rim was visible above the matrix, so I knew it was a big one, and on the other side it was peeking through, though there was no way to tell for sure it was the same fossil. At home, I tapped lightly on it with the handle of a screwdriver and the matrix slid off. I flaked as much as I felt comfortable off, but the remaining piece sticking out is much harder than the rest was and I have neither the confidence nor the tools to take it off at the moment. But it looks pretty cool to me as is

I thought it may have been Strophodonta demissa, but Steve P on the FB Devonian group was kind enough to point out the dimensions better suited M. concava.

Megastrophia concava

Mid-Devonian Hamilton

Tully limestone (way at the top of the exposure per Baird/Brett)

from Tully Center NY location

2.75" by 2.25" (with matrix 2.5")

right profile

"head" on

[RyanNREMTP]

That sure is a nice one.

[Auspex]

What a monster! Very nice