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Devonian Fossil Gallery - Brachiopod
Brachiopoda, Articulata, Spiriferida
(Phylum, Class, Order)
Red text = needs information
Fossil identification by Jo Cox unless otherwise noted
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Athyrididae
(Family)
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Cleiothyridina (Athlyris) subamellosa Period: Devonian Stage: Frasnian Formation: Lime Creek Member: Cerro Gordo Location: Bird Hill, north central Iowa Collection: Jo Cox Size: 16 mm wide Identification: Charles Newsom, U. of Iowa |
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Description: biconvex, fat teardrop --- edges of both valves sharp |
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Hysterolitidae
(Family)
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# 2 Brachyspirifer sp. Period: Devonian Stage: Frasnian Formation: Lime Creek Member: Cerro Gordo Location: Bird Hill, north central Iowa Collection: Jo Cox Size: 15 mm hinge 16 specimens, 9-21 mm wide Identification: Charles Newsom, U. of Iowa |
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Description: biconvex, fine radial ribs, width slightly more than length, curved corner, short hinge, no wings --- wide shallow sulcus on the pedicle valve, shallow fold on the brachial valve --- triangular interarea has soft edges |
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# 3 Brachyspirifer sp. Period: Devonian Stage: Frasnian Formation: Lime Creek Member: Cerro Gordo Location: Bird Hill, north central Iowa Collection: Jo Cox Size: 19 mm hinge (broken tip) 17 specimens, 7-24 mm wide Identification: Charles Newsom, U. of Iowa |
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Description: biconvex, fine radial ribs, wider than long at sharp hinge, no wings --- wide deep sulcus on the pedicle valve, deep fold on the brachial valve--- tall triangular interarea |
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# 4 Brachyspirifer sp. Period: Devonian Stage: Frasnian Formation: Lime Creek Member: Cerro Gordo Location: Bird Hill, north central Iowa Collection: Jo Cox 11 specimens, 16-23 mm wide Identification: Charles Newsom, U. of Iowa |
#4a Size: 20 mm hinge This specimen has a rectangular anterior outline that indents just before the wing flare.
#4b Size: 21 mm hinge This specimen has a rounded anterior outline. |
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Description: biconvex, fine radial ribs, wider than long at short winged hinge --- wide deep sulcus on the pedicle valve, deep fold on the brachial valve --- tall triangular interarea |
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Spririferidae
(Family)
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Neospirifer texanus Period: Devonian Stage: Frasnian Formation: Lime Creek Member: Cerro Gordo Location: Bird Hill, north central Iowa Collection: Jo Cox Size: 17 mm wide (left) 9 specimens, 9-21 mm wide Identification: Charles Newsom, U. of Iowa |
2 specimens |
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Description: biconvex, fine radial ribs, longer than wide, short sharp hinge narrower than width, no wings until very large --- wide shallow sulcus on the pedicle valve, deep fold on the brachial valve --- tall triangular interarea |
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# 5 Neospirifer sp. Period: Devonian Stage: Frasnian Formation: Lime Creek Member: Cerro Gordo Location: Bird Hill, north central Iowa Collection: Jo Cox Size: 22 mm hinge Identification: Charles Newsom, U. of Iowa |
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Description: biconvex, fine radial ribs, wide pointed winged hinge --- wide shallow sulcus on the pedicle valve, no fold on the brachial valve --- tall triangular interarea |
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Spririferinidae
(Family)
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# 2 Punctospirifer kentuckyensis Period: Devonian Stage: Frasnian Formation: Lime Creek Member: Cerro Gordo Location: Bird Hill, north central Iowa Collection: Jo Cox Identification: Charles Newsom, U. of Iowa |
#2 Size: 18 mm hinge
#3& 4 Size: 11 & 16 mm hinges |
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Description: biconvex, radial ribs (bolder than Neospirifer), wider than long at sharp hinge, none to very slight wings --- deep sulcus on the pedicle valve, deep fold on the brachial valve --- There is little difference in the three specimens. --- This site has broken specimens that might have 20 mm hinges. |
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?
(Family)
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# 1 Orthothetina sp. Period: Devonian Stage: Frasnian Formation: Lime Creek Member: Cerro Gordo Location: Bird Hill, north central Iowa Collection: Jo Cox Size: 12 mm hinge Identification: Charles Newsom, U. of Iowa |
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Description: convexi-flat, fine even radial ribs --- tall pointed pedicle valve, wide shallow sulcus, equilateral interarea --- slight convex brachial valve has no fold --- widest at hinge |
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# 2 Orthothetina sp. Period: Devonian Stage: Frasnian Formation: Lime Creek Member: Cerro Gordo Location: Bird Hill, north central Iowa Collection: Jo Cox Size: 6 mm hinge Identification: Charles Newsom, U. of Iowa |
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Description: convexi-flat, fine even radial ribs, wings --- tall pointed pedicle valve, wide shallow sulcus, wider than tall triangular interarea --- slight convex brachial valve with gentle fold --- widest at hinge |
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# 3 Orthothetina sp. Period: Devonian Stage: Frasnian Formation: Lime Creek Member: Cerro Gordo Location: Bird Hill, north central Iowa Collection: Jo Cox Size: 16 mm hinge Identification: Charles Newsom, U. of Iowa |
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Description: convexi-flat, fine even radial ribs, wings --- tall pointed pedicle valve, wide shallow sulcus, wider than tall triangular interarea --- slight convex brachial valve with gentle fold --- widest at hinge |
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