■kkl.J TENNESSEE. 303 
glomite is a rather persistent bed of more or less argillaceous Lime- 
one to which Satford long ago applied the name Lenoir limestone, 
his bed varies greatly in thickness and reaches in some places a 
liekness of several hundred feet. It corresponds in position, and in 
considerable degree also in its lithologic features, to the so-called 
Trenton 11 limestone that is employed in the manufacture of cements 
i more northern parts of the Appalachian Valley. 
The Lenoir outcrops in bands trending approximate^ parallel with 
le margins of the valley. In most of these it is overlain by a thick 
?d of shale that has been mapped in folios issued b}^ the national 
urvey as the Sevier shale. In the bands found near the eastern edge 
f the valley, in which the limestone is thin and locally wanting, the 
>wer part of the overlying beds is a dark shale, to which the name 
thens shale has been applied. In these bands the shale is overlain 
y the Tellico sandstone. Where the Athens shale is absent, as in 
le bands outcropping between Knoxville and Bays Mountain, lying 
aout 8 miles east of that city, the Lenoir limestone is much heavier 
id extends upward to the base of the Tellico sandstone. 
In the folios and other publications of the United States Geological 
ur\ ev relating to East Tennessee the Lenoir limestone is erroneously 
garded as a thin representative, or rather as an extension, of the 
asal part of the Chickamauga limestone of the western side of the 
alley. Nearty all the areas of Lenoir limestone in East Tennessee 
ave been mapped as Chickamauga limestone in the folios describing 
le geology of the Chattanooga, Cleveland, Kingston, Loudon, Knox- 
ille, Maynardville, Briceville, and Morristown quadrangles. In these 
lios the Lenoir Chickamauga limestone bands may be distinguished 
om the true Chickamauga areas by the association of one, two, or all 
three formations — viz, the Athens shale, Tellico sandstone, and 
evier shale — with the limestone in the former areas and their absence 
1 the latter. The distribution of the Silurian (iron-bearing) Rock- 
ood formation ma} r also be used in discriminating these areas, the 
asternmost bands of the Rockwood corresponding approximately to 
le western border of the area to which the Lenoir limestone, Athens 
lale, Sevier shale, and other formations pertaining to the eastern 
rovince are confined. 
Locally, especially in the bands that correspond, with respect to 
le width of the valley, to those occurring in the vicinity of Knox- 
ille, the upper part of the Lenoir contains or consists of heavy beds 
f red and gray marbles. As shown by the accompanying analyses, 
hese marbles are very pure limestones, being especially low in mag- 
Lesia. As the outcrops are often close to beds of shale, some of those 
hat for one reason or another have proved unfit to work for marble 
light still, if found suitable, be utilized in the manufacture of cement. 
