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Monomorphichnus
Classification
Phylum:
Trace Fossils and Problematica
Class:
Trace Fossils
Formal Genus Name and Reference:
Monomorphichnus CRIMES, 1970, p. 57
Type Species:
*M. bilinearis; M.
Images
(Click to enlarge in a new window)
Fig. 51,2. M. sp., showing how trace is produced by swimming-grazing manner of trilobite locomotion (Crimes, 1970b), *M. bilinearis, X0.4 (Crimes, 1970b)
Synonyms
Geographic Distribution
Eu.(Eng., N. Wales)
Age Range
Beginning Stage in Treatise Usage:
U.Cam.(Ffestiniog Stage)
Beginning International Stage:
Paibian
Fraction Up In Beginning Stage:
73.3
Beginning Date:
494.95
Ending Stage in Treatise Usage:
U.Cam.(Ffestiniog Stage)
Ending International Stage:
Jiangshanian
Fraction Up In Ending Stage:
87.5
Ending Date:
491.4
Description
Series of straight or slightly sigmoidal ridges associated in pairs; 1 ridge of each pair more prominent than the other, ridges 2 to 4 cm long, sometimes repeated laterally; trail resembling Dimorphichnus Seilacher, but without blunt markings and other markings to suggest sideways progression. [Produced by several clawed limbs of trilobites, perhaps members of the Olenidae, interpreted as swimming-grazing trail.]
References
Museum or Author Information
Classification
Phylum:
Trace Fossils and Problematica
Class:
Trace Fossils
Formal Genus Name and Reference:
Monomorphichnus CRIMES, 1970, p. 57
Type Species:
*M. bilinearis; M.
Images
(Click to enlarge in a new window)
Fig. 51,2. M. sp., showing how trace is produced by swimming-grazing manner of trilobite locomotion (Crimes, 1970b), *M. bilinearis, X0.4 (Crimes, 1970b)
Synonyms
Geographic Distribution
Eu.(Eng., N. Wales)
Age Range
Beginning Stage in Treatise Usage:
U.Cam.(Ffestiniog Stage)
Beginning International Stage:
Paibian
Fraction Up In Beginning Stage:
73.3
Beginning Date:
494.95
Ending Stage in Treatise Usage:
U.Cam.(Ffestiniog Stage)
Ending International Stage:
Jiangshanian
Fraction Up In Ending Stage:
87.5
Ending Date:
491.4
Description
Series of straight or slightly sigmoidal ridges associated in pairs; 1 ridge of each pair more prominent than the other, ridges 2 to 4 cm long, sometimes repeated laterally; trail resembling Dimorphichnus Seilacher, but without blunt markings and other markings to suggest sideways progression. [Produced by several clawed limbs of trilobites, perhaps members of the Olenidae, interpreted as swimming-grazing trail.]