Boyle Group

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]}

Boyle Group
Stratigraphic range: Devonian
Type	Group
Sub-units	Beechwood Formation Casey Limestone Kiddville Layer
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

Description

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

There are numerous fossils found within the Boyle Group.^[2]