94 ECONOMIC GEOLOGY OF AMITY QUADRANGLE, PA. 
Coal section 0.5 mile south of Houston (PI. V, No. 7). 
Ft. in. 
B0113' coal 10 
Fire clay 2 
Coal 3 
(Clay \ 
Bearing-in eoaljCoal \\ 
Iciay \ 
( loal 1] 
Fire clay. 
5 1 
Coal section 0.3 mile east of Houston (PI. V, No. 8). 
Ft. in. 
Sandy shale. 
( loal 2 
Fire clay 10 
Coal... 2 10 
{Part ing | 
Coal 2 
Parting \ 
Coal 2 
6 1 
Coal section reported <if Boon mine, northeast of Houston (PI. V, No. '.)). 
Ft. in. 
( oal . 9^ 
Clay.. 1 
Coal 3 
("Slate" | 
Bearing-in coaH Coal 2| 
l"Slate " | 
Coal 2 h 
6 21 
On Peters Creek the thickness of the lower division is 5 J to 6 feet 
and of the upper division 6 to 12 inches. The clay averages a little 
less than a foot in thickness. In the Nottingham mine a still higher 
bench is reported, 14 inches above the upper division; but this top- 
most bench is very bony. Two sections measured in this district are 
as follows : 
Coal section at the Blanche mine (PI. V, No. 10). 
Ft. in. 
Roof coal 9 
Fire clay 10 
Coal...' 3 
Bearing-in coal 3| 
Coal... 2 4| 
.7 3 
