PART I CHAZYAN AND RELATED BRACHIOPODS—COOPER 87 
formation is black shale containing a profusion of Normanskill graptolites and 
the trilobites Telephus bicornis, Robergia major, Porterfieldia caecigenus, Ampyx 
americanus, A. camurus, and Bevanopsis. The beds herein defined as the Rich 
Valley shale are the lower and characteristic part of a unit widely identified by 
Butts, Decker, and others as Athens shale. The Rich Valley corresponds to the 
lower part of the Liberty Hall black-limestone-black-shale succession of central- 
western Virginia. 
Bimuria immatura Cooper O. parvicrassicostatus Cooper 
Glyptambonites glyptus Cooper Phragmorthis buttsi Cooper 
Glyptomena parvula Cooper Ptychopleurella mediocostata Cooper 
Glyptorthis glypta Cooper P. rectangulata Cooper 
Kullervo ornata Cooper Scaphorthis perplexa Cooper 
K. parva Cooper Scaphorthis sp. 1 
Laticrura pionodema Cooper Schizambon sp. I 
Leptellina pulchra Cooper Schizotreta shuleri (Willard) 
Obolus nitens Cooper Skenidioides transversus Cooper 
Orthambomites brachiophorus Cooper Taphrorthis peculiaris Cooper 
O. divaricatus Cooper 
Rob Camp formation.—This formation was named by Miller and Brosge 
(1950) for heavy-bedded calcilutite with few fossils. The type locality is taken 
from exposures northeast of Rob Camp Church, Coleman Gap (T.V.A. 161-SW) 
Quadrangle in Virginia-Tennessee. The formation lies between the Poteet and 
Martin Creek limestones. No identifiable brachiopods have been found in this 
formation. 
Rockdell formation.—This name was proposed by B. N. Cooper (1945b, 
p. 137) for a unit composed of the Peery and Ward Cove formations where they 
are inseparable. The formation consists of 58 to 420 feet of fine-grained, dark- 
gray limestone and gray calcarenite. The type section is near Elk Garden, Russell 
County. The formation is sandwiched between the Lincolnshire and the Ben- 
bolt formations. Nidulites is present in the dark limestones. See Ward Cove 
for brachiopods. 
Rodman member of Nealmont formation.—According to the writer’s ob- 
servations, this member is really two facies rather than a true member. In cen- 
tral Pennsylvania it generally consists of about 30 feet of coarse calcarenite (simi- 
lar to St. Luke facies) containing an abundance of fossils. It occurs at the top 
of the Nealmont formation and underlies the Salona formation. In places the 
top of the Nealmont is not calcarenite but consists of thin-bedded limestone, the 
bedding being marked by thin, dark shale partings. This lithology has also been 
placed in the Rodman. The list of species presented below is composed from a 
list presented by Field (1919, p. 424) together with the species identified by 
the writer. 
Bilobia hemispherica Cooper 
*Christiama trentonensis Ruedemann 
Dalmanella n. sp. 
*Dinorthis pectinella (Emmons) 
Glyptorthis n. sp. 
