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PART I CHAZYAN AND RELATED BRACHIOPODS—COOPER 49 
other sense than a facies term except in its type belt. (See Elway and Tumbez 
for faunal lists.) 
The supposed equivalence of Murfreesboro and Blackford is explained under 
the Chickamauga limestone. The varying age of the Appalachian Mosheim fixed 
the ages of underlying beds. It takes no imagination in examining faunal lists 
said to be from the Murfreesboro of the Appalachians to understand that the 
Blackford is not the same from place to place. It is an odd fact that no uni- 
formity of faunas has been detected in this member. Few brachiopods have been 
taken from the restricted Blackford: 
Camerella sp. 2 
Obolus sp. 2 
Blockhouse formation (R. B. Neuman (1956, p. 148).—This name is pro- 
posed for dark-gray to black calcareous shale containing graptolites, exposed in 
the belt along the base of the Great Smoky Mountains in East Tennessee and 
best seen on the Blockhouse (T.V.A. 148-NW) Quadrangle where the type 
section is located. The formation ranges from 175 to 500 feet in thickness. It 
correlates with part of the Athens formation, probably the lower part. The 
Blockhouse shale rests on the cobbly Fetzer, a tongue of the Arline formation. 
Few brachiopods have been taken: 
Paurorthis catawbensis (Butts) 
Botetourt formation.—Cooper and Cooper (1946, p. 80) proposed this name 
as a member of the Edinburg formation for brown-weathering, impure granular 
limestone overlying the Lincolnshire formation. The type section is on the hill- 
side 4 mile south of Dunkard Church and 6.9 miles S. 80° W. of Natural Bridge, 
Va. This member, now made a formation, is prominent and easy to identify in 
many localities in central Virginia, but it was identified with some difficulty in 
northern Virginia, although many species of the member occur in granular lime- 
stone at the base of the Cyrtonotella zone. An excellent development may be 
examined in Catawba Valley northeast of Blacksburg where it underlies or 
fingers with calcarenites of the Effna formation. The member is here given 
formation rank. 
The Botetourt can be recognized in parts of Tennessee as at the type section 
of the Whitesburg of Ulrich. At this place it overlies the Lenoir and occurs at 
the base of Ulrich’s Whitesburg formation. It is identifiable at Mosheim and at 
Albany, Tenn. 
At Edinburg Dam section about 1 mile below Edinburg and at Tumbling Run 
14 miles southwest of Strasburg, Va., dark thin-bedded limestone occurs between 
granular beds thought to be Botetourt and the cherty Lincolnshire. These con- 
tain the trilobite Cybelloides and brachiopods such as Cristifernia that are 
clearly of post-Lincolnshire affinities. These beds are here placed in the Botetourt 
formation. 
The following brachiopods have been taken from the Botetourt formation: 
Acanthamboma virginiensis Cooper Bilobia virginiensis Cooper 
Atelelasma sp. 2 Bimuria immatura Cooper 
