Promicroceras planicosta (Sowerby)
Base cut free standing specimen. On the top surface are 7 beautifully preserved calcitic Ammonites. Very attractive piece of the famous 'Ammonite Marble'
Jurassic, Upper Sinemurian, Obtusum Zone, 'Ammonite Marble'.
Marston Magna, Somerset.
Specimen : 7 x 5 x 4 cm.
