Boyle Group
| Boyle Group | |
|---|---|
| Stratigraphic range: Devonian | |
| Type | Group |
| Sub-units |
|
| Underlies | New Albany Shale |
| Overlies | Crab Orchard Formation /Alger Shale |
| Thickness | 0-47' |
| Lithology | |
| Primary | Limestone & Dolomite |
| Other | Packstone |
| Location | |
| Region | Kentucky |
| Country | United States |
| Type section | |
| Named for | Boyle County, KY |
The Boyle Group, also known as the Boyle Limestone or Boyle Dolomite is a geologic group found in Kentucky. It dates back to the Devonian period. The Boyle is bound by two unconformities. The one at the top is the Taghanic unconformity and the one at the bottom is the Wallbridge Unconformity. The New Albany Shale uncomfortably lies on top of the Boyle. At its based the Boyle rests uncomfortably on the Crab Orchard Formation.[1] [2]
Description
[edit | edit source]The upper portion is generally characterised by medium gray to orange-buff dolomite with dolomitic limestone, it is layered with irregular, ellipsoidal, pale cream-colored chert nodules. The lower section is composed of echinoderm grainstone to silty Packstone.
Fossils
[edit | edit source]There are numerous fossils found within the Boyle Group.[2]