PART. I CHAZYAN AND RELATED BRACHIOPODS—COOPER 47 
In the Knoxville region and to the south Benbolt faunal elements appear in 
the lower part of the Ottosee (=Sevier) shale. Benbolt fossils appear in the 
upper part of the Sevier along the west front of the Great Smoky Mountains in 
a sandstone (No. 5) above the Chota sandstone of Neuman. 
In northwestern Georgia thin-bedded limestone separated by layers of shale 
occurs on U. S. Highway 27 just north of Chickamauga Creek. Mimella and a 
few other species here are suggestive of the Benbolt, but the sequence has been 
placed tentatively in the Ridley formation. 
Brachiopods are abundant in most localities of the Benbolt. The greatest 
variety occurs in the lower beds near the contact with the subjacent formation. 
Here occur genera and species reminiscent of the Arline fauna. In the higher 
shales specimens are usually more scattered and some appear in the limy cobbles 
that often make up a substantial part of the formation. Brachiopods are: 
Acanthocrania grandis Cooper 
Atelelasma planum Cooper 
Bellimurina sp. 1 
Camerella sp. 1 
Chaulistomella brevis (Willard) 
C. elongata (Willard) 
Cyrtonotella crassicostella 
(Schuchert and Cooper) 
C. fasciculata Cooper 
C. subquadrata Cooper 
Dactylogonia sp. 1 
Dactylogonia sp. 3 
Dactylogonia sp. 6 
Dinorthis interstriata Willard 
D. transversa Willard 
D. transversoides Cooper 
Eremotrema biconvexa Cooper 
Fascifera convexa Cooper 
F. stonensis (Safford) 
Glyptorthis rara Cooper 
G. uniformis Cooper 
G. uniplicata Cooper 
Hesperorthis multicostata Cooper 
Tsophragma biseptatum Cooper 
Leptellina platys Cooper 
L. pulchra Cooper 
L. sublamellosa Cooper 
Lingulella virginiensis Cooper 
Lingulella sp. 11 
Macrocoelia magna (Butts) 
M. rotunda Cooper 
Mimella globosa (Willard) 
M. sulcata Cooper 
Murinella cancellata Cooper ? 
M. muralis Cooper 
M. plana Cooper 
Oligorhynchia bifurcata Cooper 
Oligorhynchia sp. 
Opikina parvula Cooper 
Opikina pulchella Cooper 
Opikina sp. 1 
Orthambonites parvicrassicostatus Cooper 
Oxoplecia multicostellata Cooper 
O. parva Cooper 
Pachyglossa pachydermata Cooper 
Palacostrophomena resupinata Cooper 
Paurorthis ponderosa Cooper 
Perimecocoelia semicostata Cooper 
Pionodema crassipunctata Cooper 
Plectocamara aseptata Cooper 
P. sulcata Cooper 
Plectoglossa sp. 1 
Plectorthis tenuis Cooper 
Protozyga uniplicata Cooper 
Ptychopleurella uniplicata Cooper 
Rhipidomena tennesseensis (Willard) 
Rostricellula rostrata Ulrich and Cooper 
Schizambon macrothyris Cooper 
Skenidioides mediocostatus Cooper 
Sowerbyella compacta Cooper 
Strophomena anomala Cooper 
Faunal discussion and correlation of Benbolt formation.—The Benbolt fauna 
is essentially a transitional assemblage because it contains elements of the Arline 
and equivalent faunas and at the same time elements of the overlying Wardell 
assemblage. The basal beds of the Benbolt are the parts that contain most of 
the elements related to the Arline fauna such as Palaeostrophomena, Cyrtono- 
