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Beyrichoceras
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Goniatitida
Superfamily:
Pericycloidea
Family:
Maxigoniatitidae
Formal Genus Name and Reference:
Beyrichoceras FOORD, 1903, p. 219
Type Species:
Goniatites obtusus Phillips, 1836, p. 234, SD BISAT, 1924, p. 84
Images
(Click to enlarge in a new window)
Fig. 22, 4. *B. obtusum (Phillips), suture of holotype, Black Hall, Bolland, Pendleside Limestone, England, lower Goniatites Zone, upper Visean, X 3.3 (Bisat, 1924).
Synonyms
Geographic Distribution
Belgium, Great Britain, Germany, Ireland, Poland, Russia (Novaia Zemlia), South Urals, Iran, Kazakhstan (Karaganda), Portugal, Spain, Algeria, Morocco, USA (Alaska, Missouri)
Age Range
Beginning Stage in Treatise Usage:
Mississippian (Visean Beyrichoceras Zone-lower Goniatites Zone, Meramecian)
Beginning International Stage:
Visean
Fraction Up In Beginning Stage:
0
Beginning Date:
346.73
Ending Stage in Treatise Usage:
Mississippian (Visean Beyrichoceras Zone-lower Goniatites Zone, Meramecian)
Ending International Stage:
Visean
Fraction Up In Ending Stage:
65.1
Ending Date:
336.06
Description
Conch form discoidal, with very narrow umbilicus, similar to Bollandoceras, Ornamentation sometimes crenulate, constrictions may be present
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Goniatitida
Superfamily:
Pericycloidea
Family:
Maxigoniatitidae
Formal Genus Name and Reference:
Beyrichoceras FOORD, 1903, p. 219
Type Species:
Goniatites obtusus Phillips, 1836, p. 234, SD BISAT, 1924, p. 84
Images
(Click to enlarge in a new window)
Fig. 22, 4. *B. obtusum (Phillips), suture of holotype, Black Hall, Bolland, Pendleside Limestone, England, lower Goniatites Zone, upper Visean, X 3.3 (Bisat, 1924).
Synonyms
Geographic Distribution
Belgium, Great Britain, Germany, Ireland, Poland, Russia (Novaia Zemlia), South Urals, Iran, Kazakhstan (Karaganda), Portugal, Spain, Algeria, Morocco, USA (Alaska, Missouri)
Age Range
Beginning Stage in Treatise Usage:
Mississippian (Visean Beyrichoceras Zone-lower Goniatites Zone, Meramecian)
Beginning International Stage:
Visean
Fraction Up In Beginning Stage:
0
Beginning Date:
346.73
Ending Stage in Treatise Usage:
Mississippian (Visean Beyrichoceras Zone-lower Goniatites Zone, Meramecian)
Ending International Stage:
Visean
Fraction Up In Ending Stage:
65.1
Ending Date:
336.06
Description
Conch form discoidal, with very narrow umbilicus, similar to Bollandoceras, Ornamentation sometimes crenulate, constrictions may be present