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 122 mm (4.8 inches) across and the fossil ammonite measures 24 mm (0.95 of an inch) across. The ammonite is well preserved and has been prepared out of the rock to reveal the whole shell. It has part of the shell missing which is due to a bite from a predator that most likely resulted in the death of the animal. Research has suggested that these bite marks may have been caused by squid-like cephalopods that lived at the same time as these ammonites. The ribs are very finely defined, and the colour is beautiful: a mix of grey, brown and yellow. There is also an interesting geological fault running through the ammonite, which has distorted its shape slightly, adding to the interest of the piece. A great example of the species and impressive in the flesh. The fossil weighs 290 grams and has a cut flat base to allow it to stand freely on its own for display.
Around 196 million years old (Sinemurian, Early Jurassic), this fossil would make a wonderful addition to any collection.