JOHNSON: TALLULAH DISTRICT. 
225 
southwest line, parallel to the general trend of the foliation in the 
gneisses and schists of this region. 
Both the slate and the limestone appear to form narrow bands 
enclosed on either side by the mica-schist series. 
Diabase .— There is good evidence that the metamorphic series 
is cut by a number of diabase dykes. In the gorge of Little Panther 
Creek just below where it is joined by Devil Den Creek, large rounded 
boulders of diabase are found where the narrow strip of floodplain 
at this point meets the foot of the southeast wall of the gorge. These 
boulders show marked concentric weathering on the outside, but are 
quite fresh within. The ophitic texture is well developed, and is 
plainly visible on weathered surfaces. Similar boulders are found 
in the bed of the main Panther Creek below the junction of its north 
and south forks; while the presence of a west and east line of boul¬ 
ders on the lower slope of a ridge just east of the junction, indicates 
a dyke at that point. Between these two same forks of Panther 
Creek, but northwest of the railroad a mile and a half, a wide dvke 
of diabase is found near the Clayton road. 
Diorite .— In a railroad cut two miles south of Turnerville there 
is a good exposure of a dyke of diorite cutting the mica-schist series. 
The hornblende seems'quite fresh, although the dyke has been sheared 
to produce a marked gneissoid texture. The foliation in the dyke is 
not always parallel with that of the surrounding schists, and may 
even be perpendicular to it. The dip of the schists increases notice¬ 
ably near the dyke. 
General Structural Relations. 
The rocks in the Tallulah region consist largely of the mica schists 
as already noted, and as shown on the accompanying geological 
sketch map. From the description of the rocks given above, it is 
clear that they consist in part, at least, of altered sediments. No evi¬ 
dence regarding their geological age was secured in this region, but 
it is inferred that it is Algonkian. The dykes of diabase and diorite 
are probably of much more recent age, presumably Triassic as sug¬ 
gested by McCallie. 
In general, the strike of the schist is northeast-southwest, with a 
dip about twenty degrees southeast. Both strike and dip are vari¬ 
able, however, the latter changing to a marked westerly inclination. 
