54 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 127 
detail. As originally defined by Hayes for exposures in the valley of West 
Chickamauga Creek, the Chickamauga limestone embraced all the strata be- 
tween the Knox and the Rockwood formations. This included what is now 
known as the Murfreesboro, Lenoir, Mosheim, Lebanon, Lowville, Trenton, 
and Upper Ordovician. 
It is of interest to point out the composition of the type Chickamauga because 
of the interpretation put on it by Dr. Butts. Northwestern Georgia is one of the 
areas of the Chickamauga limestone in which Dr. Butts discovered that the “Mos- 
heim” limestone overlies the Murfreesboro limestone and that the Lenoir of the 
Appalachians is equivalent to the Ridley limestone of the Central Basin. This 
correlation, however, has caused a great deal of mischief. 
The location in which these views were established is in the long sequence 
exposed at intervals along the road from Pond Spring to Catlet Gap, Kensing- 
ton (T.V.A. 106-SE) Quadrangle, Ga. On the south bank of West Chicka- 
mauga Creek and on the east side of the bridge about 3 mile south of Pond 
Spring, limestones occur which contain numerous large Leperditia interbedded 
with calcilutites that weather to a white-crusted surface. These limestones have 
the lithology and some of the fossils of the Murfreesboro and were so correlated 
by Butts. The ostracod beds are succeeded by calcilutite, massive and strongly 
resembling the Mosheim. This bed was identified as Mosheim by Dr. Butts who 
thus established the position of the Mosheim above the Murfreesboro. The 
“Mosheim” bed is overlain in this section by dark limestones containing black 
chert and specimens of the gastropod identified as Maclurites magnus by Dr. 
Butts. Because of the black chert and the gastropod this limestone was linked 
to the dark chert- and Maclurites-bearing limestones of the Southern Appa- 
lachians regardless of other considerations and disregarding the fact that the 
chert contained Tetradium like T. cellulosum. Because of its occurrence above 
the Murfreesboro, this dark limestone was correlated with the Ridley limestone 
of the Central Basin which also contains Maclurites. This was done in spite of 
the fact that the chert and other fossils in true Ridley are quite different from 
those in the type Chickamauga limestone. 
Just north of the intersection of the Catlet Gap road and the road to Davis 
Crossroads, and lying on the Maclurites beds, are calcareous shaly limestones 
containing Fascifera in abundance. These were correlated with Lebanon by Dr. 
Butts. The presence of the latter genus is a link to the true Ridley of the Cen- 
tral Basin area rather than to Lebanon. The Fascifera beds are followed by thin- 
bedded limestones which are probably of Ridley age because they contain 
Mimella and Chaulistomella. They are well exposed in a quarry on the west 
side of the Catlet Gap road about half a mile south of the intersection mentioned 
above where many Wardell-Ridley types occur: Ancistrorhyncha, Opikina 
speciosa, Doleroides, Hesperorthis australis, and Protozyga rotunda. Typical 
Lebanon thin-bedded limestone with yellow shaly partings and containing 
Hesperorthis and Sowerbyella in abundance occurs beside the road 0.7 mile south 
of the Catlet Gap-Davis Crossroads road intersection and for 0.3 mile farther 
south. 
