Lower Mississippian trilobite biostratigraphy of the Central United States, and some new Osagean species

Journal of Paleontology



Six stratigraphically distinct trilobite faunas are recognized in the Lower Mississippian strata of the central United States. These faunas range in age from earliest Kinderhookian to Meramecian, and are, in ascending order: Pudoproetus missouriensis, Comptonaspis swallowi, Proetides insignis- Perexigupyge, Breviphillipsia semiteretis, Exochops portlockii, and Hesslerides bufo. Trilobite species diversity waxed and waned through the early Mississippian of the central United States, but reached its maximum during the late Kinderhookian within the Comptonaspis swallowi fauna. The Comptonaspis swallowi, Breviphillipsia semiteretis, and Exochops portlockii faunas of the mid-continent can be correlated with the C. swallowi, B. semiteretis, and Hesslerides arcentensis faunas of the Caballero and Lake Valley Formations of New Mexico. The vertical distribution, composition, and diversity variations among individual faunas suggest that they are evolutionarily discrete and therefore of biostratigraphic utility. Their stratigraphic distribution appears to be controlled by sea level and climatic fluctuations. New Osagean trilobites identified and described are Exochops burlingtonensis n. sp. and Richterella carteri n. sp. from the Burlington Formation of Missouri, Australosutura osagensis n. sp. from the Keokuk Limestone of Missouri and the Arcente and Dona Ana Members of the Lake Valley Formation of New Mexico, and Spergenaspis boonensis n. sp. from the Boone Formation of Oklahoma. Copyright ?? 2007, The Paleontological Society.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Lower Mississippian trilobite biostratigraphy of the Central United States, and some new Osagean species
Series title Journal of Paleontology
DOI 10.1666/pleo0022-3360(2007)081[0737:LMTBOT]2.0.CO;2
Volume 81
Issue 4
Year Published 2007
Language English
Larger Work Type Article
Larger Work Subtype Journal Article
Larger Work Title Journal of Paleontology
First page 737
Last page 745
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