1880.] ''^ [Stevenson, 



possibly because the group possesses comparatively little economic import- 

 ance, so that it has received less study than lias been given to the other coal 

 groups of Pennsylvania. But the close investigation, which Mr. W. G. 

 Piatt has been making of this group for the Pennsylvania Geological 

 Survey may remove the obscurity. 



The cual bed, No. 19, as exposed on Preacher run, has the following 

 structure : 



1. Gannel 2' 



3. Shale d' A" 



3. Slaty coa? 0' 4" 



4. Shale 0' 5" [• 7' 3" 



5. Coal 0' 5' 



6. Shale 0' 4' 



7. Coal 3' 5" ^ 



The cannel is compact and much like that which is obtained in Arm- 

 strong county of Pennsylvania. It contains many fragments of sandstone, 

 whose presence seems to indicate that the material of which the coal was 

 made was pulpy, not like that which accumulated to form the ordinary 

 beds. No distortion of tlie coal appears, such as was seen about the large 

 fragment whicli I discovered* in the SewicMey coal bed in Fayette county, 

 Pennsylvania. The fragments are small and angular, and doubtless they 

 were attached to some tre'^, which had been uprooted during a freshet. 

 The same bed was seen on Calahan creek, where it shows : 



Coal 0' 5" 



Shale 10' 



Coal V 2" 



Shale 7' 



Coal 0' 5" J 



19' 



and is therefore worthless. 



Coal bed, No. 21, is exposed on Preacher run and Calahan creek, and 

 fragments of it were seen on Looney creek, though the bel itself was not 

 found. On Preacher run it is finely shown at two miles from the mouth 

 of the stream, where it is from 3' 6" to 3' thick and yields a splint coal of 

 remarkably tine quality. The roofisahard, compact sapdstone and the 

 coal shows but insignificant partings. An analysis of this coal by Mr. A. 

 S. McCreath, ofthePenn. Geol. Surv., gave 



Water at 225° 0.880 



Volatile matter 37.580 



Fixed carbon 58 .059 



Sulphur 0.406 



Ash 3.075 



* Second Geol. Surv. of Penn. Rep. on Feyette and Westmoreland counties. 

 [KK.]p. 216. 



