科研之友
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摘要
The Ordovician-Silurian contact in parts of the Cincinnati Arch region is an irregularly pitted erosion surface reflecting karstic weathering during a lower-mid Silurian (Aeronian) lowstand, superimposed on the Hirnantian-Rhuddanian Cherokee Unconformity. This irregular unconformity is overlain by a unit termed the golden Brassfield, which grades laterally into strata identified as the red Brassfield, a probable equivalent of the Oldham Limestone to the east-southeast. These units are Aeronian or early Telychian, considerably younger than the Rhuddanian-early Aeronian Brassfield Formation sensu stricto. Preservation of erosional topography, resulting from rapid flooding and burial of karstic surfaces, is typical of unconformities representing moderate durations.
- 出版日期2014-1-2
