Ammonite species from the "BARREMIAN" stage (1 entry found)

The early whorls, planispirally coiled and highly evolute, are followed by a more or less straight section. The senile stage is materialized by a section of shell that turns back on itself in a hook like shape. Ornamentation based on straight, radial and simple ribs, with sporadic constrictions. At... [view details for full description]