280 F. H. Bradley—Silurian age of the Southern Appalachians. 
we cannot fairly criticize his non-adoption of the conclusions of 
Safford, although that geologist had followed the strata so con- 
nectedly, from their less altered and more fossiliferous regions, 
and was therefore least of all liable to be in error.* East of 
this Huronian is marked a belt of ‘ Laurentian,” the ee 
part of which is included in the freA in question. The write 
would here express an opinion, long held as a suspicion, but 
latterly confirmed by the results of the recent examinations of 
the crystalline rocks by Dana, Irving, Brooks and others, that 
the typical Huronian strata of the lake region, as well as ‘large 
areas elsewhere so named, are simply metamorphic Silurian. It 
is pleasant to know, from Se ae that some eminent 
ee have reached the same conclusio 
miles in diameter. To the northeast of the Little Tennessee, 
there are large areas of rocks of the same age, but of undeter- 
mined boun she and including some patches which are pretty 
certainly Archee One of these latter forms and surroun 
the “ Bluff,” on tes ba oie of Cocke County, Tenn., and Madi- 
son County, N. C., where there are rs outcrops of proto- 
gine and unakyte, with heavy beds of porphyritic hematite. 
This area—probably of the same age as the iron-bearing rocks 
of Missouri—adjoins the Warm Springs region before men- 
tioned ; and it may be well to say here that in Emmons’ figure 
tl. ©.) of the section there exposed, No. 15 is Chilhowee sand- 
stone ; ae and 13 are Ocoee, some by a fault from 
is Chilhowee sandstone; 9 to 1 are Obes, probably resting 
upon Archean. If thie is “typical Lower Taconic,” it is typi- 
cal Lower Silurian as well. It is perhaps pertinent to note here 
that Emmons’s Upper Taconic (1. ¢., pp. 62-68) is plainly only 
bat slightly (or not at all) mega pie AP Silurian of the Great 
alley. 
* It is but justice to Professor rome gh to say here that, during five years of fre- 
quent reference to his Report, in connection with field-work upon nearly all parts 
Gis Gevicuianl jecinn ttnked in n Kast Tennessee, the writer, while recognizing 
many local deficiencies and some errors, such as are unavoidable in rapid work, 
Tennessee, a8 
well as to science, that Professor Safford has not been employed to com complete the 
Setsiied vurvey of the Olde 
