PART I CHAZYAN AND RELATED BRACHIOPODS—COOPER 99 
Woodway formation.—This formation name was proposed by Miller and 
Brosge (1950) for cryptocrystalline, tan and gray limestone with interbeds and 
zones of medium-crystalline limestone. A prominent zone of Stromatocerium 
rugosum occurs at the base. The formation is named from exposures on the 
slope of Wallen Ridge east of Woodway, Stickleyville (T.V.A. 179-NW) Quad- 
rangle, Va. Brachiopods occurring in this formation are: 
Ancistrorhyncha costata Ulrich and Cooper 
Doleroides cf. D. gibbosus (Billings) 
Hesperorthis aff. H. tricenaria (Conrad) = H. australis Cooper 
Pionodema minuscula Willard 
Protozyga sp. 
Rostricellula sp. 
Strophomena sp. 
Zygospira recurvirostris (Hall) 
Besides the Stromatocerium this formation contains Crypiophragmus. The 
former is more commonly a Wardell species, and the latter belongs to the Witten 
formation as a rule. It is evident, therefore, that Miller and Brosge’s Woodway 
formation includes parts of the Wardell (=Upper Dryden) and Witten forma- 
tions. Of the brachiopods the Ancistrorhyncha and Hesperorthis australis are 
Wardell fossils. Pionodema and Zygospira are Witten guide fossils. 
Yellow Branch member of Poteet formation (B. N. Cooper and G. A. 
Cooper).—This thin but easily recognizable unit corresponds to the “nine-foot 
limestone bed” of Butts (1940b, p. 122, pl. 24, C) in the much-discussed section 
along Yellow Branch (so called locally, but Yellow Creek on the Rose Hill 
Quadrangle), 54 miles south of Hagan and 2 miles north of the Tennessee line, 
Rose Hill (T.V.A. 161-NE) Quadrangle. The formation is gray, thick-bedded 
calcarenite about 8 or 9 feet thick, and carries fossils that make it of special in- 
terest. The brachiopod genera Mimella, Glyptorthis, Camerella, and Murina 
are suggestive of the upper Ridley, although Butts classed the beds in the Mur- 
feesboro limestone. The Yellow Branch member is also fully exposed along 
the L. and N. RR. switchback south of Hagan, Lee County, Va. 
Camerella edmundsoni Cooper Mimella globularis Cooper 
Dactylogonia sp. 8 Murinella muralis Cooper 
Glyptorthis senecta Cooper 
5. THE CENTRAL BASIN OF TENNESSEE, WELLS CREEK BASIN AND 
HIGH BRIDGE, KENTUCKY 
The early Middle Ordovician sequences of the Central Basin of Tennessee 
and High Bridge, Kentucky, are composed of limestones closely related faunally 
to the upper part of Southern Appalachians sequence. A complete section from 
the Lower Ordovician to the Trenton is not exposed in either area because the 
bottom portion, probably several hundred feet thick, is under cover. 
