Xipheroceras trimodum
Base cut slab of 'Ammonite Marble' from Marston Magna. With a beautifully preserved 3D Xipheroceras. Developed right to the protoconch and showing tubercles. Hard to obtain.
Jurassic, Upper Sinemurian, Obtusum Zone, 'Ammonite Marble'.
Marston Magna, Somerset.
Ammonite :2.5 cm diam.