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The AAPG/Datapages Combined Publications Database
CSPG Special Publications
Abstract
Boundaries and Correlations
Silurian-Devonian relationship in Oklahoma
Abstract
Silurian and Devonian strata crop out in eastern Oklahoma, in the Arbuckle Mountains-Criner Hills, and in the Ouachita Mountains. The precise age of the Ouachita strata is uncertain and they are not herein considered. Silurian and Devonian strata are also present in the subsurface over a large area. The Devonian includes the Upper Devonian and Mississippian Woodford-Chattanooga Shale, and a sequence of Lower Devonian carbonates: Haragan-Bois d’Arc Formations, Helderbergian (Gedinnian) age; Frisco Formation, Deerparkian (Siegenian) age; Sallisaw Formation, Esopusian (Emsian) age. The Silurian is entirely carbonate and represented by formations of Early (Llandoverian), Middle (early Wenlockian), and Late (early Ludlovian) Silurian age: Henryhouse, Clarita, Cochrane, and Keel Formations in the Arbuckles, and Quarry Mountain, Ten-killer, and Blackgum Formations in the east. At the surface the pre-Woodford part of the sequence has a maximum thickness of about 400 feet; in most subsurface areas these strata do not exceed 500 feet, although they may thicken in the Anadarko basin. Excluding this basin, where lithostratigraphic and biostratigraphic evidence is meager, these beds comprise an incomplete section of discrete stratigraphic units separated by unconformities. This pattern produces a sequence whereby Silurian strata may be overlain by the Haragan-Bois d’Arc (Helderbergian), Frisco (Deerparkian), Sallisaw (Esopusian) or Woodford (Late Devonian) Formations. Conversely the Devonian may be underlain by formations of Late, Middle, or Early Silurian, or Ordovician age. Such a relationship indicates clearly that sedimentation over most, if not all, of the state was discontinuous, being frequently interrupted by periods of uplift and erosion.
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