Notoceras Cretaceous Heteromorph Ammonite from Madagascar Ammonites are excellen…
Notoceras Cretaceous Heteromorph Ammonite from Madagascar Ammonites are excellent index fossils, and it is often possible to link the rock layer in which a particular species or genus is found to specific geologic time periods. Their fossil shells usually take the form of planispirals, although there were some helically spiraled and nonspiraled forms (known as heteromorphs
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