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Silurian trilobites from the St Clair limestone (Arkansas) and Clarita formation (Oklahoma)

Trilobites of Wenlockian age from the St Clair Limestone of northern Arkansas are described and assigned to 81 species (38 named) and 38 genera. Three of the genera - Dipharangus, Lygdozoon and Kerinion - and 15 of the species are new. The trilobite fauna of the Clarita Formation Wenlockian of south central Oklahoma is similar in composition to that of the St Clair and some Clarita specimens are described to supplement the St Clair material or for comparison with it. The new species are described from the Clarita Formation. The similarity of the St Clair trilobite fauna to those from the Wenlockian of Britain and Czechoslovakia reflects the relative cosmopolitanism of Silurian faunas in general, and the closest affinity seems to be with other Wenlockian trilobite faunas of eastern North America, particularly with those of the Niagaran dolomites of the Great Lakes region. This may be in part due to the occurrence of both the St Clair and Great Lakes faunas in pure carbonate facies.
Date January 1978
CreatorsHolloway, David John
PublisherUniversity of Edinburgh
Source SetsEthos UK
Detected LanguageEnglish
TypeElectronic Thesis or Dissertation

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