No. 1621. 
LATE NIAGARAN STRATA—PATE AND BASSLER. 499 
Composite section of Ordovician-Devonian rocks of west Tiennessee—Continued. 
eral | 
2 Columnar 
4 q x j . 4 
5 ra secon Description. 
R SG (Dixon). 
AY x = 
Lego limestone. 
Compact gray to-white argillaceous and suberystalline limestone with 
few fossils. 
46/ 
oo 
ne Waldron sbales. 
; White indurated clay and argillaceous limestone, holding the typical 
ZA 4 Waldron fauna. 
a 
a FS ea | | 
5 | Laurel limestone. 
| Massive, pink to reddish purple argillaceous and crystalline lime- 
Z | stone. 
«| 
S | 
= 
& 28/ 
a 
; | Osgood limestone. 
| Thin bedded, reddish, argillaceous limestone containing Stephanocri- 
14’ nus osgoodensis, Pisocrinus gemmiformis, and typical Caryocrinus 
: ornatus. 
| “ Clinton’’ formation. 
alee Wee White to light brown crystalline, fossiliferous limestones with greenish 
brown chert. 
Fernyvale formation. 
Bluish shales in upper half, coarse grained, cross bedded, light colored 
phosphatic limestone in lower. Rhynchotrema capax, Dinorthis sub- 
quadrata, D. proavita, Strophomena planodorsata, and Rhombotrypa 
pei quadrata observed. 
| (Ger OM Cena 
Arnheim (‘‘ Warren’’) formation. 
3/ Coarsely crystalline phosphatic limestone weathering into abundant 
Thai chert. The lowest layer is of dark conglomeratic material, made 
S| up of the easts of Cycloras and containing large and small fragments 
i | of the underlying Hermitage limestone. 
om Hermitage (‘‘Saltillo’’) formation. 
z Bluish gray, compact argillaceous limestone alternating with blue 
v shales. Fossils few but Dalmanella testudinaria var. fertilis, Leptobolus 
fe) lepis, Tremctis punctistriata, Schizocrania rudis, Whiteavesia sp., 
: Zygospira modesta, and Hindia sphaeroidalis are occasionally seen. 
O/-+ 
