Harrell Shale Devonian Harrell Formation is a mapped bedrock unit in Pennsylvania , Maryland , West Virginia , and Virginia .Description The Harrell Formation was first described by Charles Butts in 1918. Hasson and Dennison 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 : Styliolina fissurella Type locality is at Horrell Station , Blair County, Pennsylvania .Age Relative age dating places the Harrell in the late Devonian.
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