"Popped" Asteroceras obtusum ammonite fossil (68 mm) pyrite The piece of limestone matrix

The piece of limestone matrix measures 146 mm (5

both the positive shell and cast in the matrix were revealed

It weighs 335 grams

These are the most sought-after colours in these fossils and this example is as good as they get

There is also a rare bivalve shell that attached itself to the ammonite when it was lying on the seafloor before being fossilised

"Popped" Asteroceras obtusum ammonite fossil (68 mm) pyrite The piece of limestone matrixA stunning example of a calcite ammonite fossil of the species Asteroceras obtusum from the world famous Jurassic Coast beach of Lyme Regis, Dorset UK. The ammonite sits inside the original piece of limestone matrix in which it was found, that has been split open to reveal both the positive and negative parts of the shell. The main piece of matrix measures 165 mm (6. 5 inches) across and the fossil ammonite measures 68 mm (2. 72 inches) across. The