Promicroceras planicosta Sowerby.
Free standing base cut piece of the famous 'Ammonite Marble' shaped like a spearhead. Crowded with 3D beautifully preserved Ammonites. All still retaining their original white shell.
Jurassic, Upper Sinemurian, Obtusum Zone.
Marston Magna, Somerset.
Specimen : 10.5 cm tall.