84 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 127 
or slabby limestone. In the eastern belts the member attains a thickness of 238 
feet, but it thins to 21 feet near Spring Run; it thickens again to the west and 
is 41 feet thick in Blacklog Valley. Echinosphaerites is abundant in the lower 
part of the member and Nidulites in the upper part. Brachiopods are numerous: 
Bilobia virginiensis Cooper 
Bimuria parvula Cooper 
*Camerella sp. cf. C. varians Billings 
Cyphomena angulata Cooper 
Dinorthis transversa Willard 
*Doleroides (?) sp. 
Glyptoglossa cavellosa Cooper 
Glyptorthis sp. cf. G. bellarugosa (Conrad) = G. equiconvexa Cooper 
*Hesperorthis sp. cf. H. tricenaria (Conrad) 
Leptaena sp. = L. ordovicica Cooper 
*Leptellina (?) sp. cf. L. elegantula Butts 
Lingula sp. 
Lingula sp. 10 
Lingulasma sp. 2 
Mimella sp. 
*Multicostella sp. 
Opikina bellula Cooper 
*Opikina sp. cf. O. ruedemanni Salmon 
Opikina sp. cf. O. wagneri (Okulitch) 
Orthambonites bielstein Cooper 
O. rectangulatus Cooper 
Oxoplecia aff. O. calhouni Wilson = O. magnaplicata Cooper 
*O. simulatrix (Bassler) 
*Parastrophina sp. cf. rotundiformis (Willard) 
Paurorthis ponderosa Cooper 
Plectocamara magna Cooper 
Plectorthis sp. 1 
Protozyga sp. 
Pseudolingula sp. 1 
Resserella sp. = Paucicrura matutina Cooper 
Scaphorthis kayi Cooper 
*Skenidium (?) sp. cf. S. anthonense (Sardeson) = Skenidioides obtusus Cooper 
S. aequicostellata Cooper 
*Sowerbyella sp. cf. S. aequistriata (Willard) = S. aequicostellata Cooper 
Sowerbyella sp. cf. S. alternata Butts = Eoplectodonta ? dubia Cooper 
“Sowerbyella” sp. cf. “S.” piswum (Ruedemann) = Bilobia virginiensis Cooper 
Strophomena sp. 
Strophomena sp. 1 
Strophomena sp. 2 
Correlation of Pinesburg member.—The lower part of the Pinesburg member 
is its most fossiliferous part. This contains the Echinosphaerites zone and numer- 
ous representatives of the Cyrtonotella zone of the Edinburg formation of Vir- 
ginia. The upper boundary of the Pinesburg member has not yet been identified 
in Virginia. 
Poteet formation.—Miller and Brosge (1950) proposed this name for 45 to 
97 feet of gray-brown and tan, fine-grained, heavy-bedded limestone named from 
