From the Jurassic ,upper Kimmeridgian.
Collected from Real de Catorce, San Luis Putosi Mexico.
Most of the ammonites that come out of Mexico are in poor condition but this is really very good ,with some nice striations on the outer whorl and the vestigial tubercles,there is also the added bonus of a small Idoceras to!
This is a very rare ammonite!
The ammonite is preserved in black and measures 47mm, the entire piece measures 51mm x 47mm.