A stunning example of an ammonite fossil of the species Promicroceras planicosta from the world-famous Jurassic Coast beach of Charmouth, Dorset UK.
The ammonite measures 36 mm (1.4 inches) across, which is huge for this species and about as big as they get, though part of the outer whorl is missing. The ammonite sits in one of two pieces of limestone matrix that measure 123 mm (4.85 inches) tall. This is a classic "popped" stone, where the rock has been split to reveal both the positive cast of the shell and the negative impression. The two pieces fit back together with a surprise inside! The ammonite is very well preserved and has been prepared out of the rock to reveal the shell. The ribs are very finely defined, and the light yellow and brown colour is beautiful. A great example of the species and impressive in the flesh.
The combined weight of the two pieces is 880 grams and both have a cut flat bases to allow it them stand freely on their own for display.
Around 196 million years old (Sinemurian, Early Jurassic), this fossil would make a wonderful addition to any collection.