60 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 127 
Edinburg formation (Echinosphaerites-Cyrtonotella zone) 
Bilobia virginiensis Cooper Opikina bellula Cooper 
Bimuria parvula Cooper O. dorsatiformis Cooper 
Christiania platys Cooper Opikina sp. 3 
C. subquadrata (Hall) Orthambonites bielsteini Cooper 
Cristiferina cristata Cooper Oxoplecia multicostellata Cooper 
Cyphomena angulata Cooper Palaeoglossa sp. 1 
Cyrtonotella subplana Cooper Paucicrura matutina Cooper 
Dactylogonia strasburgensis Cooper Perimecocoelia semicostata Cooper 
Dinorthis transversa Willard Plectocamara magna Cooper 
Eoplectodonta ? dubia Cooper Ptychoglyptus virginiensis Willard 
Laticrura pionodema Cooper Scaphorthis kayi Cooper 
Leptaena ordovicica Cooper Sowerbyella aequicostellata Cooper 
Leptellina sp. 1 Trematis sp. 3 
Limbimurina brevilimbata Cooper 
Edinburg formation (Nidulites zone) 
Christiania platys Cooper O. dorsatiformis Cooper 
C. subquadrata (Hall) Paucicrura virginica Cooper 
Cyphomena angulata Cooper Paurorthis spinosa Cooper 
Dinorthis transversa Willard Plectocamara transversa Cooper 
Hesperorthis sp. 2 Skenidioides obtusus Cooper 
Lingulasma sp. 3 Sowerbyella aequicostellata Cooper 
Opikina alata Cooper 
Effna formation.—This name was proposed by B. N. Cooper (1944, p. 59) 
for calcarenites overlying the Lincolnshire limestone and underlying the “Whites- 
burg” limestone. The type section is in and near the McNutt Quarry located 
about 12 miles southwest of Bland (14 miles southeast of Sharon Springs), Va. 
The formation is generally composed of calcarenite or shell debris or both. At 
the type locality it attains a thickness of about 221 feet, but it is thinner to the 
southwest along the same belt and also in the northern belt. One of the best places 
for the study of this formation is at the Porterfield Quarry, 5 miles east of Salt- 
ville. At this place the Effna formed a great reef (now quarried away) at the 
base of the Rich Valley formation. The McNutt Quarry locality is also a reef, 
and it is likely that others appear along that line of outcrop. In Catawba Valley 
Effna banks of calcarenite appear at the same level and in places interfinger 
with the Botetourt formation as well as overlie it. 
The fauna of the Effna is essentially that of the Arline formation of Tennessee. 
At the Porterfield Quarry the Effna rests on a thin tongue of the Arline forma- 
tion. It is evident, then, that the Effna is of the same age as part of the Arline 
formation. It is therefore also evident that the Effna formation is older than the 
Red Knobs formation which contains a thick calcarenite that overlies the Arline 
in the Friendsville area. 
Brachiopods are abundant in the reefy limestone as follows: 
Bimuria superba Ulrich and Cooper C. plana Cooper 
Camerella minuta Cooper C. triangulata Cooper 
Christiania subquadrata (Hall) Cyrtonotella grandistriata (Willard) 
Conotreta cuspidata Cooper Dactylogonia sp. 5 
