Trilobites of the Monola Formation
Monola Formation, southern Great Basin (eastern California):
(Saline Range, California)
Trilobites:
Amecephalus
arrojosensis (Lochman, 1952)
Mexicella robusta Sundberg
and McCollum, 2000
Microryctocara
nevadensis Sundberg and McCollum, 1997
Nyella? plana Sundberg
& McCollum, 2003a
Nyella?
sp.
Onchocephalites
claytonensis Sundberg
& McCollum, 2003b
Onchocephalites
laevis
Rasetti, 1957
Oryctocephalites resseri Rasetti, 1951
Oryctocephalus
americanus (Sundberg 2003)
Oryctocephalus indicus
(Reed, 1910)
Oryctocephalus nyensis (Palmer,
in Palmer & Halley, 1979)
Oryctocephalus orientalis Saito, 1934
Oryctocephalus sp.
Paraantagmus latus Yuan & Li, 1999
Syspacephalus
variosus
Sundberg & McCollum, 2003b
Tonopahella goldfieldensis Sundberg & McCollum, 2003b
Tonopahella walcotti (Sundberg & McCollum, 2000)
Wenkcheminia
spinicollus?
Rasetti, 1951
Wenkcheminia sulcata Rasetti, 1951
Formation Divided in Zones:
Albertella Biozone:
-no faunal list yet....
Oryctocephalus indicus Biozone:
Microryctocara nevadensis Sundberg and McCollum, 1997
Nyella? plana
Oryctocephalites resseri Rasetti, 1951
Oryctocephalus indicus (Reed, 1910)
Oryctocephalus nyensis
Syspacephalus variosus
Amecephalus arrojosensis Biozone:
Amecephalus arrojosensis
Mexicella robusta
Nyella? plana
Onchocephalites laevis
Oryctocephalus orientalis
Oryctocephalus sp.
Paraantagmus latus
Syspacephalus granulosus?
Syspacephalus variosus
Tonopahella goldfieldensis
Tonopahella walcotti?
Wenkcheminia spinicollus
Wenkcheminia sulcata
also reported :
Alokistocare
Ogygopsis
Glossopleura
Comments:
The lower 15 metres or so of the Monola Formation is in the Amecephalus arrojosensis Biozone. Above this is the Oryctocephalus indicus Biozone (approx. 5 m thick). Above this is the Albertella Biozone.
References:
Sundberg, F.A., and McCollum, L.B., 2003b, Early and Mid Cambrian trilobites from the outer-shelf deposits of Nevada and California, USA. Palaeontology, v. 46, part 5, p. 945-986.
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