Xipheroceras trimodum with Promicroceras planicosta (Sowerby)
Small piece of the famous 'Ammonite Marble' from Marston Magna. On one side is a 3D Xipheroceras and on the other a fine Promicroceras. .
Jurassic, upper Sinemurian, Obtusum Zone, 'Ammonite Marble'.
Marston Magna, Somerset.
Specimen : 5.5 x 6 cm.
