PART I CHAZYAN AND RELATED BRACHIOPODS—COOPER 85 
exposures along the lane north of Poteet Ford, Ben Hur (T.V.A. 170-NE) 
Quadrangle, Va.-Tenn. A zone of calcarenite 7 to 8 feet thick (Yellow Branch 
member) occurs near the base. The zone is well exposed on the road along Yel- 
low Creek on the south-central margin of the Rose Hill (T.V.A. 161-NE) Quad- 
rangle. Brachiopods are mostly from the calcarenite near the base and are listed 
under the heading of Yellow Branch member of the Poteet formation. 
Correlation of Poteet formation.—This formation underlies the Rob Camp for- 
mation and overlies the Dot formation. The latter belongs to the Blackford facies 
here, a probable partial equivalent of the Lincolnshire formation. The Poteet is 
thus probably related to the Ward Cove formation. 
Pratt Ferry formation.—This name is here proposed (B. N. Cooper and 
G. A. Cooper) for the limestone at the base of the black Columbiana shale 0.2 
mile southeast of Pratt Ferry. Widening and paving of the road at this locality 
has resulted in a fine exposure. The rock is also well exposed in the woods on 
the east side of the road. About 8 feet of somewhat bituminous calcarenite are 
exposed in layers varying in thickness up to 4 inches or more. This is the only 
exposure of the formation known in Alabama. It overlies heavy-bedded gray 
limestone mapped as Lenoir limestone but which contains the Christiania fauna 
of the Little Oak (see Little Oak). The Pratt Ferry is overlain by black shale 
with Nemagraptus and other graptolites of that zone. 
The formation abounds in fossils. Trilobites are numerous, particularly Tele- 
phus, Trinodus, and ceraurids. Brachiopods are abundant and include a variety 
of inarticulate genera as well as a rich representation of articulates. Treatment 
with acetic acid yields a harvest from this limestone. Many bizarre and unusual 
genera are now known from this formation: 
Acanthambonia minutissima Cooper Kullervo sulcata Cooper 
Anisopleurella tricostellata Cooper Leptellina pulchra Cooper 
Bellimurina sulcata Cooper Lingulella alabamensis Cooper 
Bimuria siphonata Cooper L. lirata Cooper 
Christiania subquadrata (Hall) L. pachyderma Cooper 
Conotreta apicalis Cooper Lingulella sp. 8 
C. concentrica Cooper Nothorthis tarda Cooper 
C. depressa Cooper N. transversa Cooper 
C. gigantea Cooper Obolus sp. 3 
C. multisinuata Cooper Obolus sp. 4 
Craspedelia marginata Cooper Orthambonites tenuicostatus Cooper 
Cyclomyonia peculiaris Cooper Pachyglossa dorsiconvexa Cooper 
Dictyonites perforata Cooper P. pachydermata Cooper 
Diorthelasma parvum Cooper Parallelelasma pentagonum Cooper 
Elasmothyris concinnula Cooper Parastrophina bilobata Cooper 
Elliptoglossa ovalis Cooper Paterula perfecta Cooper 
Eoconulus rectangulus Cooper Perimecocoelia semicostata Cooper 
Ephippelasma minutum Cooper Phragmorthis buttsi Cooper 
Eremotoechia silicica Cooper Ptychoglyptus virginiensis Willard 
Glossella papillosa Cooper Rhysotreta corrugata Cooper 
Glyptambonites glyptus Cooper Scaphelasma septatum Cooper 
Glyptorthis glypta Cooper Schizambon sp. 2 
Isophragma sp. 1 Schizotreta corrugata Cooper 
