Ammonites are the most widely known fossil. They are an extinct group of marine invertebrate animals of the class Cephalopoda, modern members include the nautilus, octopus, squid and cuttlefish.
Ammonites first appeared in the early Devonian period (about 400 Mya) and became extinct at the end of the Cretaceous period along with the dinosaurs. They are excellent index fossils, and it is often possible to link the rock layer in which they are found to specific geological time periods.
Our Society - GSHK
The Geological Society of Hong Kong is a non-profit organisation that attempts to promote geological and earth science studies within Hong Kong and the adjacent region.
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