Harrell Shale facts for kids
Quick facts for kids Harrell FormationStratigraphic range: Middle Devonian-Late Devonian |
|
|---|---|
| Type | sedimentary |
| Sub-units | Burket Shale Member |
| Underlies | Brallier Formation, Sonyea Formation, Trimmers Rock Formation |
| Overlies | Mahantango Formation, Millboro Shale, and Tully Limestone |
| Lithology | |
| Primary | shale, sandstone |
| Location | |
| Region | Appalachian Mountains |
| Country | United States |
| Type section | |
| Named by | Charles Butts, 1918 |
The Devonian Harrell Formation is a mapped bedrock unit in Pennsylvania, Maryland, West Virginia, and Virginia.
Contents
Description
The Harrell Formation was first described by Charles Butts in 1918. Hasson and Dennison (1978) state "The Harrell Shale consists of very dark gray, thinly laminated, platy- to sheety-weathering shale underlain in certain areas by the grayish black shale of the Burket Member."
Fossils
Hasson and Dennison reported the following fossils from several outcrops of the Harrell:
- Bivalvia: Buchiola livonae (?), B. retrostriata, Paracardium doris, Pterochaenia fragilis, Lunlulicardium (?)
- Cephalopoda: Bactrites aciculum, Probeloceras lutheri
- Cricoconarida (class of Mollusca): Styliolina fissurella
Notable Exposures
Type locality is at Horrell Station, Blair County, Pennsylvania (40°27′N 78°17′W / 40.450°N 78.283°W).
Age
Relative age dating places the Harrell in the late Devonian.
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Harrell Shale Facts for Kids. Kiddle Encyclopedia.