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Showing results for tags 'productus'.
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From the album: Lower Carboniferous Ireland
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- 1
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- brachiopod
- dublin
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From the album: Lower Carboniferous Ireland
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- 3
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- brachiopod
- dublin
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Together with Bryozoa and other Brachiopods. Taxonomy from Fossilworks.org, From Lutz-Garihan 1979, p. 463: “ Shell small; pedicle valve with moderately well-developed ears, convexity unknown because of deformation of shells, but umbo extends somewhat beyond hinge; greatest width at mid-length of valve; ornamentation of pedicle valve consists of rugae and growth lines, some rugae enlarged as nodes occasionally, and in some specimens, some costae develop at about half the distance from posterior but are somewhat irregular; relatively thick spines along hinge and irregularly across valve. Brachial valve gently concave, with ears: surface ornamentation has a wavy appearance because of sometimes irregular growth lines and rugae; some rugae interrupted by nodes; costae irregularly developed an some brachial valves; but not extending completely to posterior; spines probably absent, some brachial valves convex at center of hinge on exterior for a minute part of length, giving appearance of a node at this position. No interior structures seen.” Identified by oilshale using Lutz-Garihan 1979. References: Girty, G. (1911) THE FAUNA OF THE MOOREFIELD SHALE OF ARKANSAS. DEPARTMENT OF THE INTERIOR UNITED STATES GEOLOGICAL SURVEY. BULLETIN 439. 1-145 Lutz-Garihan, A.B. (1979) Brachiopods from the Upper Mississippian Bear Gulch Limestone of Montana. Compte Rendu, Neuvième Congrès International de Stratigraphie et de Géologie du Carbonifère. Vol. 5: 457–467pp. Link: Browse Collections - College of Humanities and Sciences / UM Paleontology Center - University Of Montana (umt.edu)
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- 1
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- bear gulch
- carboniferous
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the incomplete ventral valve is rather large, about 5cm wide and 8 cm longe, convext, sulcus deep and thin for productus type. It has a kind of triangle shape, with the beak broken and bent down. The beak itself actually look like a normal shaped productus, with costae and concentric lines at right angles forming a grid like network. The concentric lines are missing in other part of the shell, though the tubercles seem to be scatterd every where. I have never seem any thibk like this. Could it just be a drastically deformed productus of some kind, or some individual that got some abnormal growth in its life?
- 12 replies
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- early permian
- linoproductus
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From the album: Invertebrates
? Productus moorefieldanus Girty Early Carboniferous Heath Shale Formation Bear Gulch Fergus County Montana USA-
- bear gulch
- carboniferous
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