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Showing results for tags 'scaphopods'.
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Scaphopods - Mississippian Period - LAEVIDENTALIUM Matrices 1.JPG
Dpaul7 posted a gallery image in Member Collections
From the album: MY FOSSIL Collection - Dpaul7
Scaphopods -Three LAEVIDENTALIUM Matrices Chesterian Zone of the Bangor Limestone Formation in northern Alabama Mississippian Period - (ca 325,000,000 years old) Dentaliida is one of the two orders of scaphopod mollusks, commonly known as elephant's tusk shells. The order Dentaliida contains most of the larger scaphopods, and is distinguished from the other order (the Gadilidae) by the shape of its shell (the Dentaliid shell tapers uniformly from anterior to posterior; the Gadilid one has an anterior shell opening slightly smaller than the shell's widest point), the shape of the foot (the Dentaliid foot is boat-shaped with a central trough; the Gadilid foor is star-shaped), and the arrangement of some of their internal organs. Dentaliidae is a family of relatively large tusk shells, scaphopod mollusks in the order Dentaliida. Kingdom: Animalia Phylum: Mollusca Class: Scaphopoda Order: Dentaliida Family: Laevidentaliida Genus: Laevidentalium-
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Scaphopods - Mississippian Period - LAEVIDENTALIUM Matrices 1.JPG
Dpaul7 posted a gallery image in Member Collections
From the album: MY FOSSIL Collection - Dpaul7
Scaphopods -Three LAEVIDENTALIUM Matrices Chesterian Zone of the Bangor Limestone Formation in northern Alabama Mississippian Period - (ca 325,000,000 years old) Dentaliida is one of the two orders of scaphopod mollusks, commonly known as elephant's tusk shells. The order Dentaliida contains most of the larger scaphopods, and is distinguished from the other order (the Gadilidae) by the shape of its shell (the Dentaliid shell tapers uniformly from anterior to posterior; the Gadilid one has an anterior shell opening slightly smaller than the shell's widest point), the shape of the foot (the Dentaliid foot is boat-shaped with a central trough; the Gadilid foor is star-shaped), and the arrangement of some of their internal organs. Dentaliidae is a family of relatively large tusk shells, scaphopod mollusks in the order Dentaliida. Kingdom: Animalia Phylum: Mollusca Class: Scaphopoda Order: Dentaliida Family: Laevidentaliida Genus: Laevidentalium-
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- mississippian period
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Scaphopods - Mississippian Period - LAEVIDENTALIUM Matrices 1.JPG
Dpaul7 posted a gallery image in Member Collections
From the album: MY FOSSIL Collection - Dpaul7
Scaphopods -Three LAEVIDENTALIUM Matrices Chesterian Zone of the Bangor Limestone Formation in northern Alabama Mississippian Period - (ca 325,000,000 years old) Dentaliida is one of the two orders of scaphopod mollusks, commonly known as elephant's tusk shells. The order Dentaliida contains most of the larger scaphopods, and is distinguished from the other order (the Gadilidae) by the shape of its shell (the Dentaliid shell tapers uniformly from anterior to posterior; the Gadilid one has an anterior shell opening slightly smaller than the shell's widest point), the shape of the foot (the Dentaliid foot is boat-shaped with a central trough; the Gadilid foor is star-shaped), and the arrangement of some of their internal organs. Dentaliidae is a family of relatively large tusk shells, scaphopod mollusks in the order Dentaliida. Kingdom: Animalia Phylum: Mollusca Class: Scaphopoda Order: Dentaliida Family: Laevidentaliida Genus: Laevidentalium-
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- mississippian period
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Permian Scaphopods from the Fort Apache Limestone
Arizona Chris posted a topic in Micro-paleontology
HI all, Our latest finds from the acid fines from our new site on the Mogollon Rim - Scaphopods (Tusk Shells) from the Permian Fort Apache Limestone East of Payson. A minor but very important faunal element in the upper early Permian Fort Apache Limestone are Scaphopods - Or more commonly known today as "Tusk Shells". These mollusks were conical tubes - some linearly ribbed some smooth, with both ends open for water current movement. Fortunately for us, In 1963 White, in his monumental GSA Memoir 89 had found the smooth scaphopods, and identified them as Plagioglypta. We also found a smaller number of ribbed scaphopods which were a different genus. The most complete scaphopod material never had transverse ribs, even in their juvenile sections. About Preservation A wide range of sizes of scaphopods were found, ranging from millimeter sized diameters to nearly a centimeter. The larger conchs were usually flattened and many cracked under the pressure of the overlying sediments. About half of them were still filled with terriginous material after dissolution in acid, and only the short sections were free of internal sediment. Most were seen to have a curved profile, especially the juveniles. Smooth exterior (Plagioglypta canna) Four sections of Plagioglypta, with varying degrees of flattening. (7x) A complete specimen would have been up to 80mm long. Although poorly preserved in white silica, this pair of nearly complete tiny scaphopods shows the curving nature very well. Three more with varying amounts of curvature. One of the largest flattened specimens. Section of a large scaphopod. End on view showing wall thickness. The top is cracked inward from the overlying sediment pressure. Dentalium sp. Linearly ribbed exterior (Dentalium sp.) The ornamented exterior of this genus is stunning under the side lighting! Worn piece with the larger part at bottom having its ribs worn smooth by wave action. Close up of linear ribbing. Thanks for looking!- 1 reply
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- arizona
- fort apache limestone
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