This Specimen has been sold.
1.6" Wide Kosmoceras Ammonite - England
This is a 1.6" wide Kosmoceras (Guliemiceras) jasoni ammonite from Ashton Keynes, Gloucestershire, England. The ammonite is beautifully prepared in the matrix in which it was found. They are often found in clusters which can lead to parts of other ammonites or gastropods to become part of the matrix. This makes each specimen unique and truly one of a kind. This specimen is particularly nice because there is another 1" small ammonite on the the back of the large one.
Ammonites were predatory mollusks that resembled a squid with a shell. These cephalopods had eyes, tentacles, and spiral shells. They are more closely related to a living octopus, though the shells resemble that of a nautilus. True ammonites appeared in the fossil record about 240 million years ago. The last lineages disappeared 65 million years ago at the end of the Cretaceous.