Promicroceras

Promicroceras is an extinct ammonite genus from the upper Sinemurian of Europe, named by Leonard [Frank Spath|Leonard Spath] in 1925. Promicroceras is included in the family Eoderoceratidae, which is part of the ammonitid superfamily Eoderoceratoidea.
Shells are evolute with an open umbilicus; strongly ribbed, ribs flattened on the venter, and with small spines without distinct tubercles.

Distribution

Promicroceras species are commonly found in South [West England], particularly along the Dorset coast.
Pyritic Promicroceras fossils are commonly found along the coast of Lyme Regis and Charmouth where they are well preserved in the Lower Jurassic Black Ven Marl. Fossil shops in the area commonly sell cleaned and polished Promicroceras.