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Marathonites
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Subclass:
Ammonoidea
Order:
Goniatitida
Suborder:
Goniatitina
Superfamily:
Marathonitoidea
Family:
Marathonitidae
Formal Genus Name and Reference:
Marathonites BÖSE, 1919, p. 133
Type Species:
M. J. P. Smithi, OD
Images
(Click to enlarge in a new window)
Fig. 98, 1a-d. *M. jpsmithi, upper Gaptank Formation, Virgilian, Wolfcamp Hills, western Texas, a-c, lectotype (herein), TMM-B34364 (Böse, 1919, pl. 6, 78, 81-83), × 1.67 (new), d, topotype, diameter at 23 mm (Miller & Furnish, 1940a).
Synonyms
Policeras; Martites
Geographic Distribution
Pennsylvanian (upper Moscovian–Gzhelian): USA (Texas, Oklahoma, Ohio), Desmoinesian–Virgilian; Russia and Kazakhstan (Southern Urals), Gzhelian.
Age Range
Beginning Stage in Treatise Usage:
Pennsylvanian (upper Moscovian)
Beginning International Stage:
Moscovian
Fraction Up In Beginning Stage:
66
Beginning Date:
309.78
Ending Stage in Treatise Usage:
Pennsylvanian (Gzhelian)
Ending International Stage:
Gzhelian
Fraction Up In Ending Stage:
100
Ending Date:
298.89
Description
Marathonitids in which the first external lateral lobe resembles the other two external lateral elements in being symmetrically tridentate, Dorsal lobe broad and deeply tripartite (D2 D1 D2) to conch diameters in excess of 2 cm, Mature specimens may exhibit weak geniculate coiling, but umbilicus remains open
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Subclass:
Ammonoidea
Order:
Goniatitida
Suborder:
Goniatitina
Superfamily:
Marathonitoidea
Family:
Marathonitidae
Formal Genus Name and Reference:
Marathonites BÖSE, 1919, p. 133
Type Species:
M. J. P. Smithi, OD
Images
(Click to enlarge in a new window)
Fig. 98, 1a-d. *M. jpsmithi, upper Gaptank Formation, Virgilian, Wolfcamp Hills, western Texas, a-c, lectotype (herein), TMM-B34364 (Böse, 1919, pl. 6, 78, 81-83), × 1.67 (new), d, topotype, diameter at 23 mm (Miller & Furnish, 1940a).
Synonyms
Policeras; Martites
Geographic Distribution
Pennsylvanian (upper Moscovian–Gzhelian): USA (Texas, Oklahoma, Ohio), Desmoinesian–Virgilian; Russia and Kazakhstan (Southern Urals), Gzhelian.
Age Range
Beginning Stage in Treatise Usage:
Pennsylvanian (upper Moscovian)
Beginning International Stage:
Moscovian
Fraction Up In Beginning Stage:
66
Beginning Date:
309.78
Ending Stage in Treatise Usage:
Pennsylvanian (Gzhelian)
Ending International Stage:
Gzhelian
Fraction Up In Ending Stage:
100
Ending Date:
298.89
Description
Marathonitids in which the first external lateral lobe resembles the other two external lateral elements in being symmetrically tridentate, Dorsal lobe broad and deeply tripartite (D2 D1 D2) to conch diameters in excess of 2 cm, Mature specimens may exhibit weak geniculate coiling, but umbilicus remains open