Iridescent Cleoniceras Ammonite with Attached Bivalve

Cleoniceras besairei Ammonite & Bivalvia indet.

Geologic Time: Upper Early Cretaceous, Albian Stage

Size (25.4mm=1 inch): 115 mm diameter, 27 mm across living chamber

Fossil Site: Mahajanga Province, Madagascar

Fossil Code: AM035

Price: $90.00 - sold


Description: This fine ammonite is Cleoniceras from Madagascar which has much of the original iridescent shell present. This is a consequence of light passing through the various layers of aragonite and conchiolin deposited by the ammonite in life. The lack of acidity in the depositional environment allowed them to be preserved as you see it here. Notice the play of colors when the viewer’s aspect changes. The most unusual feature of this specimen is that there is also a preserved 8 mm x 6 mm bivalve attached to the shell. It is not known whether this was a post-mortem attachment or not, but it renders an already fine specimen all the more interesting.

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