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The Ames Structural Depression: An Endogenic Cryptoexplosion Feature Along a Transverse Shear
A long history of tectonic activity is documented for the origin of the Ames depression: subsidence in lower Ordovician is demonstrated prior to the uplift and volcanism which occurred in earliest middle-Ordovician time. The "Chestnut Volcanics" as herein defined and described are composed of classic ignimbrites of volcanic breccia and welded tuff. These rocks comprise the first recognized volcanic rocks of lower Ordovician age in Oklahoma.
The volcanic rocks, and the Ames depression in which they are located, are genetically related to transcurrent faulting associated with the Mid-Continent Rift. Further evidence is presented which suggests a relationship of the Ames depression to an alignment of cryptoexplosive features found across Kansas, Missouri, and Kentucky.
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