The closest living relative of the Ammonitida fossil rock is not the modern Nautilus. They somewhat outwardly resemble. Rather the subclass of octopus, squid, and cuttlefish.
Ammonites is specifically to the order Ammonitida. Therefore, it is an extinct group of marine animals belonging to the cephalopod subclass Ammonoidea. However, they are excellent index fossil rock. Therefore, it is often possible to link the rock layer in which they are found, to specific geological time periods.
Across: 6 – 6.5 cm / 2.4 – 2.6 inches
Weight: 0.3 kg / 0.66 lb
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