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TF0322 - Ammonite

TF0322 hand specimen. Note shell shape.

TF0321 sketch.

Species

Hildoceras bifrons

Stratigraphic Range

Jurassic

Taxonomy

Phylum: Mollusca
Class: Cephalopoda
Subclass: Ammonoidea
Order: Ammonitida

Distinctive Features

Planispiral
Evolute
Ribs

Preservation

Mineral replacement of shell (aragonite to silica)