* a ae 
oS of Micsieipy by L. Harrer, LL.D., State Geologist 
Geology and Mineralogy. | 131 
This section embraces only a portion of the rocks of La Salle, while 
in Bureau County, beds occur which overlie all those here given 
I will forward to the Academy, as soon as completed, a notice of the 
geology of that region, together with that of such other sections of the 
State as appear, from a comparison of their fossils, to be of the same age. 
= ey fe Sei 81, 1858.” 
m the Survey of South edo being the Second An- 
progress of the Survey during the bbe? sn ; Les Oscar M. L 
“ed 
lina, which is illustrated, for ah with a s Solbie map. The order in the 
rocks recognized is the following, commencing above: I. Blue limestone ; 
II. Jtacolumitic Group, including, a. Itacolumite, 6. taleose mn a Ca- 
tawbarite, c. white or mottled limestone, d. itacolumite, ¢ tabirite and 
Beclar schist , f. itacolumitic conglomerate and fine grai ined poresteites 
Group below the itacolumite, a. clay slate, 6. talcose slate, c. mica 
slate, d. gneiss—Besides these there are the i igneous rocks, which are di- 
vided into the granitic and “ trappean,” the former including granite and 
eurite, the latter diorite, aphanite, minette, aphanitic porphyry, schistose 
aphanite, dioritic slate, saponite eae ences We suspect that 
even the granite and diorite, as well as of the other ale trap- 
ogy of the region e udied. 
(which is made identical Md melaphyre,) a in part at least, a true trap- 
Pp ew E 
slightly from from nite in structure, but taining less of honblendie 
beds. There ay very few if any valuable mineral veins in the 
The mica slate contains the Cameron Galena mine and the iron mines at 
the Cowpens and at the Hurricane Shoals. Over the clay slate lies the 
itacolumite. At the top of Gilkey’s Mountain, in Northern Union, Mr. 
Lieber found this rock passing into a coarse sandstone and soe ches 
showing that itacolumite is throughout a ‘metainorpolll aah 
some of the pebbles of the conglomerate are an inch and a oe in diam: 
ined near 
Limestone Springs in Spartanburgh District. Gold has never sien found 
in the itacolumite of South Carolina. With the itacolumite occurs the 
sch y of 
iron; and ita a similar rock contai as largely of magnetic iron. 
The ae ore re quality and eat abundance. The author 
describes with valuable detail the mines of gold, copper, lead and iron of 
the regions, and treats also in a following chapter “ the soils and 
agit ture. The maps are neatly colored, and instructiv 
. Preliminary Report on the Geology and Agricuttre A the State 
