Welcome to Catnapin's
Cretaceous Fossil Gallery - Ammonite
Mollusca, Cephalopoda, Ammonitida
(Phylum, Class, Order)
Red text = needs information
Fossil identification by Jo Cox unless otherwise noted
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Acanthoceratidae
(Family)
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Calycoceras (Acanthoceras) wintoni Period: upper Cretaceous Formation: Eagle Ford Location: Tarrant Co., Texas Collection: Abilene Christian University Natural History Collection Size: 54 mm Dia. |
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Conlinoceras (Calycoceras) tarrantense Period: upper Cretaceous Location: Tarrant Co., Texas Collection: Hardin-Simmons University Size: 32 mm Dia. |
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Tarantoceras sellardsi Period: upper Cretaceous Location: Tarrant Co., Texas Collection: Hardin-Simmons University Size: 167 mm Dia. |
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Watinoceres sp. Period: upper Cretaceous Location: Dallas Co., Texas Collection: Jo Cox Size: 56 mm long block |
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Note: purchased specimen |
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Brancoceratidae
(Family)
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Deiradoceras amsbury Period: upper Cretaceous Location: Trans-Pecos Co., Texas Collection: Hardin-Simmons University Size: 200 mm Dia. |
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Description: very evolute and uneven coil |
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Oxytropidoceras supani Period: upper Cretaceous Location: near Clifton, Texas Collection: Hardin-Simmons University Size: 210 mm Dia. |
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Description: narrow ribs. Note written on fossil: "Ammonite; Cliftan, Texas; 1907; Watts" |
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Engonoceratidae
(Family)
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Engonoceras sp. Period: lower Cretaceous Location: Tarrant Co., Texas Formation: Comanche Peak Collection: Abilene Christian University Natural History Collection, #378 Size: 75 mm Dia. |
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Description: saddle undivided, lobe narrow with small divisions - flat venter 4-5 mm wide |
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Engonoceras sp. Period: lower Cretaceous Group: Fredericksburg Formation: Walnut / Comanche Peak Undifferentiated Location: Taylor Co., Texas Collection: Hardin-Simmons University Size: 72 mm wide section |
X |
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Description: saddle undivided, lobe narrow with small divisions - flat venter 3-5 mm wide |
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Metengonoceras sp. Period: lower Cretaceous Group: Fredericksburg Formation: Walnut / Comanche Peak Undifferentiated Location: Taylor Co. near Tuscola, Texas Collection: Abilene Christian University Natural History Collection Size: 99 mm Dia. |
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Description: saddle and lobe undivided - sharp venter |
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Metengonoceras sp. Period: lower Cretaceous Group: Fredericksburg Formation: Walnut / Comanche Peak Undifferentiated Location: Taylor Co., Texas Collection: Hardin-Simmons University Size: 128 mm Dia. |
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Description: saddle and lobe undivided, last three sutures have a few divided lobes - no venter remains |
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Metengonoceras dumbi Period: lower Cretaceous Location: Bosque County, Texas Collection: Dr. R. H. Tull Size: 165 mm Dia. |
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Description: saddle undivided, lobe narrow with small divisions - sharp venter |
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Texanitidae
(Family)
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? (like Menabites) Period: upper Cretaceous Location: ? Collection: Hardin-Simmons University Size: 254 mm Dia. |
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Description: the coil of this species does not start in the center, so it has a "donut hole". |
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?
(Family)
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Eutrephoceras dekai Pet name: Herbert Period: upper Cretaceous Formation: Pierre Shale Location: South Dakota Collection: Judie Ostlien Identified by: Judie Ostlien Size: ? mm Dia. |
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Description: this specimen was hauled out of a creek bed in two sections, 20 years apart. |
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Scaphitidae
(Family)
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"Scaphites" Common Name: Scaphites Period: upper Cretaceous Formation: Pierre Shale Location: South Dakota Collection: Judie Ostlien Identified by: Judie Ostlien Collected by: Sterling Betts of Chadron Nebraska Size: ? mm Dia. |
multiple specimens |
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Baculitidae
(Family)
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Baculites sp. Period: upper Cretaceous Formation: Pierre Shale Location: South Dakota Collection: Judie Ostlien Identified by: Judie Ostlien |
#1
#1 Size: ? mm long, side, showing nacher #2 Size: ? mm long, side, showing suture patterns #3 Size: ? mm wide, end, showing septa (chamber wall) and siphuncle (buoyancy tube) #4 Size: ? mm wide, end, showing calcite crystals in chamber |
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Description: sections. This ammonite's shape is a flattened cone. |
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Nostoceratidae
(Family)
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Heliocerous sp. Period: upper Cretaceous Formation: Pierre Shale Location: South Dakota Collection: Judie Ostlien Identified by: Judie Ostlien Size: ? mm long |
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Description: section. These ammonites coil in an open spire. |
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Didymocerous helioceras Period: upper Cretaceous Formation: Pierre Shale Location: South Dakota Collection: Judie Ostlien Identified by: Judie Ostlien Collected by: Sterling Betts of Chadron Nebraska Size: ? mm Dia. |
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Description: section. These ammonites coil in a helical spire. |
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