Geology and Natural History. 367 
northward. The First Basin is similarly split into two, east of 
Johnstown, by the Viaduct anticlinal, which may or may not be 
an actual prolongation of Negro Mountain. 
my report to the owners of the property will suffice. The accom- 
panying map shows the Backbone of the Alleghany passing by 
Altoona. This is the eastern edge of the First Bituminous Coal 
asin. The two 
Connellsville enclose the Second Bituminous Coal Basin of Penn- 
sylvania. The Third, Fourth and Fifth lie west of it, and the 
Sixth occupies the northwest corner of the map; no mountains 
Separating the last four. [The map referred to is here omitted ]. 
The property surveyed, in this instance, lies in my old tramping 
and camping ground of 1840, during the fifth year of the State 
Geological Survey. The report which Mr. James T. Hodge and 
myself made to Mr. H. D. Rogers, Chief of the Survey, may be 
found recorded in the Fifth Annual Report (1841), pages 89-92, 
which I will here recapitulate in the descending order of the beds, 
for convenience of comparison. 
¢ Pittsburg bed, I, has been eroded from the whole country 
between the Alleghany Mountain and Chestnut Ridge (at Con- 
nellsville and Blairsville) except two hill tops; one near Salis- 
ury, and the other near Ligonier. It is possible also that a third 
exception may be discovered in the high hill country south of 
Johnstown, where a conspicuous bench runs along the hill-tops 
for several miles. : ’ : 
Limestone 20 feet below I, 6 feet thick in the Ligonier Basin. 
Coal bed H, 50 feet below I, 3 feet thick in the Ligonier Basin; 
1 foot thick in the Salisbury Basin. os : 
oal bed G, 100 feet below H, 14 feet thick in the Salisbury 
Basin; encircles the highest hill-tops in the Ursina Basin with 
Conspicuous bench. Fort Hill is not quite high enough to have it. 
b . : 
mM the Salisbury Basin. It forms the high terrace of the Fort Hill. 
k. 
