nonspiraled
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Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. Royalty Free Stock Photo
Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. Royalty Free Stock Photo
Antique engraved illustration of the ammonoidea. Vintage illustration of the ammonoidea. Old picture. Book illustration Royalty Free Stock Photo
   
   
   
   
Amoniti Fossile
   
   
   
   
   
   
   
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 geological 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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