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Grayiceras
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Ammonitida
Superfamily:
Haplocerataceae
Family:
Mayaitidae
Formal Genus Name and Reference:
Grayiceras SPATH, 1923
Type Species:
G. blanfordi SPATH, 1923
Images
(Click to enlarge in a new window)
Fig. 359,2. *G. blanfordi: 2a-c, x0.3 (533*)
Synonyms
Geographic Distribution
Cutch
Age Range
Beginning Stage in Treatise Usage:
U.Oxf.
Beginning International Stage:
Oxfordian
Fraction Up In Beginning Stage:
50
Beginning Date:
158.16
Ending Stage in Treatise Usage:
U.Oxf.
Ending International Stage:
Oxfordian
Fraction Up In Ending Stage:
100
Ending Date:
154.78
Description
A macrocephalitoid form of uncertain affinities and age, thought by Waagen and Uhlig to be Oxfordian (Mayaites beds) and by Spath (1924, p. 11) to be Tithonian, but later included by Spath (1928, p. 224) in Mayaitidae (1928) although already chosen as type genus of his "family" Grayiceratidae (1925).
References
Spath, L. F., 1923, The ammonites of the Shales-withBeef: Quart. Jour. Geol. Soc. (London), v. 79, p. 66-88.
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Ammonitida
Superfamily:
Haplocerataceae
Family:
Mayaitidae
Formal Genus Name and Reference:
Grayiceras SPATH, 1923
Type Species:
G. blanfordi SPATH, 1923
Images
(Click to enlarge in a new window)
Fig. 359,2. *G. blanfordi: 2a-c, x0.3 (533*)
Synonyms
Geographic Distribution
Cutch
Age Range
Beginning Stage in Treatise Usage:
U.Oxf.
Beginning International Stage:
Oxfordian
Fraction Up In Beginning Stage:
50
Beginning Date:
158.16
Ending Stage in Treatise Usage:
U.Oxf.
Ending International Stage:
Oxfordian
Fraction Up In Ending Stage:
100
Ending Date:
154.78
Description
A macrocephalitoid form of uncertain affinities and age, thought by Waagen and Uhlig to be Oxfordian (Mayaites beds) and by Spath (1924, p. 11) to be Tithonian, but later included by Spath (1928, p. 224) in Mayaitidae (1928) although already chosen as type genus of his "family" Grayiceratidae (1925).
References
Spath, L. F., 1923, The ammonites of the Shales-withBeef: Quart. Jour. Geol. Soc. (London), v. 79, p. 66-88.