A. W. Vogdes— Geology of Catoosa Co., Ga. 475 
the outburst of trachyte, forming those hills, caused frightful 
distortion of the Laramie beds. It is clear, then, that the Ga- 
listeo group can not be conformable to the Laramie. The for- 
mer group does not cross the Galisteo creek at any point. 
The lower sandstone of the Galisteo group was followed up 
the creek for more than seven miles above Galisteo, and its 
ashen color gives a strange appearance to the deeply eroded 
face of the mesa. The vertical yellow and almost white sand- 
stones of the Lower Dakota yield readily to the weather and 
the debris from the light gray Galisteo sandstone mingles with 
that from these; so that, to one ascending the creek and follow- 
ing the line of the eastern fault, the Galisteo sandstone seems 
to be triple, white, yellow and gray, whereas the white and 
yellow belong to the Lower Dakota, on which the Galisteo 
sandstone rests unconformably. 
The coal beds of the Placer mountains, oceupying the pla- 
teau between those mountains and Galisteo creek are synchro- 
nous with those of the Trinidad coal field and belong to what 
is known as the Laramie group. which, however, is synony- 
mous, in part at least, with Fox Hills. : 
The Galisteo group rests unconformably on the Laramie and 
Dakota; and contains a great bed composed wholly of the 
later lavas; it is therefore Tertiary. 
Art. LIX.—Short Notes upon the Geology of Catoosa County, 
Georgia; by A. W. VOGDES, U. S. Army. 
A snort distance west of Catoosa Station, on the Western 
and Atlantic Railroad, we find a small cut which exposes the 
rocks of the Niagara period. This formation 1s composed in 
descending of the following strata: reer 
1. Thin bed of limestone made up of crinoidal joints. 
2. Cherty bed containing the columns of Caryocrinus. 
3. Shaley beds with concretions. peg a 
4. Black slate containing about fifty per cent of bituminous 
matter. 
asses through a cut of about 100 feet. On the 
map of the county this is known as section 28, lot no. 204, or 
‘Taylor's Ridge. This section exposes an outcropping forma- 
tion of the Upper Silurian Age which belongs to the Clinton 
