A stunning example of an ammonite fossil of the species Promicroceras planicosta from the world-famous Jurassic Coast beach of Lyme Regis, Dorset UK.
The piece of limestone matrix measures 108 mm (4.25 inches) wide and the fossil ammonite measures 25 mm (0.98 inches) across, which is large for this species. The ammonite is very well preserved and has been prepared out of the rock to reveal the whole shell. The ribs are very finely defined, and the colour is beautiful: a mottled mix of browns. It split open when the rock was broken apart, revealing the internal "dog tooth" crystalline structure of the shell. A great example of the species and impressive in the flesh. The fossil weighs 400 grams and has multiple cut flat bases to allow it to stand freely on its own for display in multiple ways.
Around 196 million years old (Sinemurian, Early Jurassic), this fossil would make a wonderful addition to any collection.