Monola Formation


The Monola Formation is a geologic formation in California. It preserves fossils dating back to the Cambrian period.

Geology

The Monola Formation is primarily composed of siliceous shales, and greyish-black clay shale, and calcareous siltstone. In parts of the siliceous shale, there are occasional layers of lime mudstone and bioclastic limestone.

Paleobiota

The Monola Limestone contains a small collection of trilobites, like Glosopleura and Alokistocare.

Arthropoda

GenusSpeciesNotesImages
AlokistocareAlokistocare sp.Ptychoparid trilobite.
SyspacephalusSyspacephalus sp.Ptychoparid trilobite.
ParaantagmusP. latusPtychoparid trilobite.
AmecephalusA. arrojosensisPtychoparid trilobite.
MexicellaM. robustaPtychoparid trilobite.
OnchocephalitesO. laevisO. resseriPtychoparid trilobite.
SyspacephalusS. variosusS. granulosus Ptychoparid trilobite.
TonopahellaT. goldfieldensisT. walcotii Ptychoparid trilobite.
Nyella N. planaPtychoparid trilobite.
GlossopleuraGlossopleura sp.Corynexochid trilobite.
OryctocephalusOryctocephalus sp.O. orientalisO. indicusO. nyensisCorynexochid trilobite.
MicroryctocaraM. nevadensisCorynexochid trilobite.
BathyuriscusBathyuriscus sp.Corynexochid trilobite, previously reported as Wenkchemnia sulcata and W. spinicollis.
OgygopsisOgygopsis sp.Dorypygid trilobite.