go SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 127 
Sevier formation (=facies).—This name is applied to a thick series of 
sandy shales and fine-grained sandstones with intercalated beds of calcarenite, 
bryozoan “reefs,” and thin lenses of sandy limestone. The color of the rock is 
blue-gray when fresh but weathers to a dull yellow. The formation is very thick 
and is best developed in the belts south of Knoxville and along the Great Smoky 
Mountain Front into northern Georgia. In the vicinity of Friendsville the Sevier 
formation overlies the Red Knobs formation and contains fossils that suggest a 
Benbolt age. In the belt along the Great Smoky Mountain Front, on the other 
hand, the Sevier formation is very extensive. In northern Georgia, near the 
village of Cisco, Sevier-type lithology succeeds Tellico sandstone and extends 
to the base of the Bays red beds. The Sevier appears to be a facies rather than 
a definite formation. 
In Guthrie Gap, southeast of Whitehorn, Bulls Gap (T.V.A. 171-SE) Quad- 
rangle, fossils have been taken from Sevier-type rock at the church in the gap 
which indicate a correlation of that part of the Sevier with the Witten formation. 
In the vicinity of Fourmile Church, Tallassee (T.V.A. 139-SE) Quadrangle, 
fossils taken just under the Bays red beds contain Pionodema and are thus like- 
wise indicative of a Witten age. The evidence indicates that the Sevier ranges 
from Benbolt to as high as Witten in the standard section. 
The subjoined list indicates the species that have been identified from the 
Sevier formation, and in the right-hand column the probable level from which 
each was taken. 
Chaulistomella brevis (Willard) Benbolt-Wardell equivalent 
Cyclospira sulcata Cooper Wardell : 
Cyrtonotella magna Cooper Benbolt - 
Dactylogoma sp. 4 
Dinorthis tenuis Cooper 
D. transversa Willard 
Glyptorthis subcarinata Cooper 
G. uniformis Cooper 
Hesperorthis dubia Cooper 
Multicostella robusta Cooper 
Oligorhynchia angulata Cooper 
O. bifurcata Cooper Witten i. 
Oxoplecia multicostellata Cooper Benbolt ¥ 
O. planiventra Cooper ms 
Paurorthis ponderosa Cooper 
Rhipidomena filicostellata Cooper 
Sowerbyites delicatus Cooper 
Sphenotreta cuneata Cooper Witten is 
Teratelasma neumani Cooper Benbolt 
Zygospira mediocostellata Cooper Witten 
Zygospira sp. " a4 
The lower part of the Sevier just above the Meadow marble contains many 
species suggestive of Hogskin affinities. This is taken as a facies development 
in the lower yellow shales of the Sevier which are similar to the Hogskin shale. 
Shannondale member of Benbolt formation.—This is another name of 
