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From the album: Cephalopods
Name: Discoscaphites conradi Phylum Mollusca; Class Cephalopoda; Subclass Ammonoidea; Order Ammonitida Geological Time: Cretaceous Size: 22 mm (24 mm by 26 mm matrix base) Fossil Site: Fox Hills Formation, South Dakota The high degree of preservation of its natural mother-of-pearl shell makes it appear to be preserved as gemstone. This is a consequence of light passing through the various layers of aragonite and conchiolin deposited by the ammonite in life. Conchiolin is secreted by various other mollusks, including oysters, and is a complex protein. The colors change with changing perspective but the dominate green mixed with pink stand out for this little gem. -
From the album: Cephalopods
Name: Discoscaphites conradi Phylum Mollusca; Class Cephalopoda; Subclass Ammonoidea; Order Ammonitida Geological Time: Cretaceous Size: 26 mm (40 mm by 78 mm matrix base) Fossil Site: Fox Hills Formation, South Dakota The high degree of preservation of its natural mother-of-pearl shell makes it appear to be preserved as gemstone. This is a consequence of light passing through the various layers of aragonite and conchiolin deposited by the ammonite in life. Conchiolin is secreted by various other mollusks, including oysters, and is a complex protein. The colors change with changing perspective. -
From the album: Cephalopods
This Hoploscaphites nicoletti fossil ammonite is from the Trail City Member of the Fox Hills Formation (Late Cretaceous, Maastrichtian) of South Dakota. The ammonite measures approximately 2.3 inches in diameter, and sits on a base of original matrix that measures approximately 4.5 x 6 inches. The whole ammonite was "popped" out from the matrix upon which it rests, and is equally well preserved on both sides. The shell has a beautiful pearly iridescent sheen.-
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