THE LOWER COAL MEASURES. 273 
The Lower Kittanning coal is not found in the township, so far as 
known, but both the Freeport coals occur, as will presently be shown. 
The appended diagram represents the structure of the seam in its 
more moderate development : 
R.STOCKE R'IS COA L,NEAR PORT WASHINGTON, 
ee 
Botton. 
1se- clay 
The same conditions prevail in all essential respects in Clay town- 
ship. The Putnam Hill limestone makes the lowest important stratum 
of the township. The fuel supply is mainly furnished by the same 
persistent seam that we are now following. At one or two points, how- 
ever, the coal is characterized by some features that have not been 
before reported. 
The following skeleton section illustrates the leading facts in the 
geology of the township: 
Brush Oreek coal, DlOSSOM ..............cseseeseesecveeeeen (No. 7a.) 
Mn Gerivallieccwnsccscccoccscsecssessseseesssaslecetttedswessesces 50 feet. 
(WfoOeHe INS SNONAG ECE d45500500600600000000000000000000000000000 2 feet thick (No.7). 
Upper Freeport clay. 
Interval, from coal to coal ...............cseeeeeeeees 120 feet. 
Middlerkattanmingteoalleccc..-c.. sc. sccrcescetssecerones 4 feet thick (No. 6). 
VINTRETA FEAL 600000650006 000003 BEDS BOGE CEU B IB BOs ORDO COICO 68 feet. 
letra en, JENN MONTE ET OTEYS) 5440960000009000509000006000000000005 3 feet. 
Brook.villl CX coalectcecseees sacs ccosssossiswesovecccvassisisee'sseueses 13 feet (No. 4). 
At the bend of the canal, near lock 17, the following short but 
interesting section is well exposed : 
18 G. 
