90 



INDEX TO THE STRATIGRAPHY OF NORTH AMERICA. 



sequence. An exception to this general fact occurs in northeastern Tennessee, 

 where a complete conformable sequence from Safford's Ocoee into the fossiliferous 

 Cambrian has been worked out by Keith. (See section, Greeneville and Roan 

 Mountain quadrangles, pp. 95-96.) The discovery of Carboniferous plants near 

 Mosely (now Erin), in Clay County, Ala., in metamorphosed rocks which have been 

 regarded as a part of Safford's Ocoee (see Chapter VIII, p. 363), shows that the 

 metamorphic terrane of which his Ocoee there has been considered a part locally 

 comprises rocks of various ages. 



The fossiliferous Cambrian formations of Tennessee range from Lower Cam- 

 brian (Georgian) up through the entire system and pass into Lower Ordovician 

 in the Knox dolomite. Beneath the fossiliferous strata occur others which have 

 no fossils but which are conformable to those that have. The strata vary along 

 the valley from southwest to northeast and more markedly across the valley from 

 southeast to northwest. Some typical sequences are as follows: 



Generalized section west of Southern Railway. ^^^'^ 



