TENNESSEE. 481 



dwell at largo upou his work, which is of no importance in reference to 

 the question before us. The views he appears to hold with regard to 

 the eruptive and older stratified rocks in general are quite analogous 

 to those of Prof. C. H. Hitchcock, which have already been presented, as 

 well as to those of the geologists of the Fortieth Parallel Survey, to 

 which reference will be made a little farther on. 



TENNESSEE. 



Prof. J. M. SafFord, in his first Report on the Geology of Tennessee, 

 185G, referred the mctamorphic rocks of the State to the Azoic, separat- 

 ing them into two series : the semi-metamorphic, and the metamorphic. 

 In the Final Eeport (1869) the metamorphic rocks were regarded as 

 Azoic or Eozoic ; but he states that they can be traced in part to un- 

 metamorphosed beds, and from what follows it will be seen that he 

 regarded them as in part formed from and in part conformably under- 

 lying the Ocoee group, which he referred to the Potsdam. He says of 

 the metamorphic rocks of the State : — 



" With reference to age, I have no reason for believing that this group, 

 within Tennessee, includes the metamorphosed beds of any formation of more 

 recent date, than the Ocoee Conglomerate and Slates. A portion of the beds 

 are certainly referable to the Ocoee Group ; the remainder, although conform- 

 able, may be older, and most Ukely are. There are sections which show 

 clearly the change of the conglomerate, and its associated rocks, into gneiss and 

 mica, and other slates. In approaching, for instance, the Ducktown region, 

 from the west, the pebbles of the conglomerate gradually lose their forms, 

 becoming more and more, small, shapeless masses of quartz, and yet discern- 

 ible, even when the gneissoid or complete metamorphic character is seen. In 

 tlie northern part of the State, at many points, the passage of the Ocoee beds 

 into gneiss, is gradual and apparent. A considerable part, indeed, of our meta- 

 morphic rocks, can be, I think, thus referred to these beds. The question as 

 to the greater age of other parts, is not so easily settled, and must remain open 

 for the present. I know of no sufficient reason for referring any of these rocks 

 to the Huronian or Laurentian series of Canada." {I. c, pp. 177, 178.) 



Prof Frank H. Bradley holds that all the metamorphosed rocks in 

 Tennessee were Silurian. (Am. Jour. Sci., 1875, (3) IX., pp. 279-288, 

 370-383.) 



VOL. VII. — NO. 11. 31 



