192 Gr 5 . REPORT OF PROGRESS. I. C. WHITE. 



observed rate of dip. But as the horizontal distance is more 

 than a mile in the first case and about J mile in the second, 

 there is plenty of room for change in rate of dip, and hence 

 for a considerable error. However I do not think these esti- 

 mated intervals can be more than 100 out of the way for 

 both, and possibly much less. 



Pottsville conglomerate. — The base of ~No. XII occurs just 

 across the Wayne county line, in the edge of Lackawanna, 

 where it caps a high ridge in a bold cliff of snow white rock, 

 a perfect agglomeration of small quartz pebbles, there being 

 apparently very little fine sand in its composition ; on ac- 

 count of its purity, and freedom from iron it has been 

 largely quarried and used in the manufacture of glass at 

 Honesdale and other places. The dij3 is here 8° N. 35° W. 

 magnetic. From this point the rock descends westward at 

 the same rate as the slope of the Moosic range, and passes 

 under water level beneath the Lackawanna river not to re- 

 appear until we cross the coal basin and find it coming up 

 to daylight again in the Lackawannock range. 



The dip due west from the high ridge is 4°, as I deter- 

 mined by obtaining a sight on the outcrop of the rock one- 

 half mile down the mountain. 



The coaly shale and two succeeding members of the se- 

 ries were seen along the stream which descends to Hones- 

 dale from No. 4 Pond. 



The GriswoloV s Gap conglomerate, is quite massive, and 

 huge blocks of it are strewn over the surface around its out- 

 crop, which comes about one half mile east from the sum- 

 mit of the Moosic range ; the rock contains immense quan- 

 tities of large angular, very white quartz pebbles, imbedded 

 in a matrix of coarse darkish gray sand which weathers 

 whitish on exposure ; near the base of the stratum is a layer 

 of calcareous conglomerate (2' to 3') containing many fish 

 bones, quartz pebbles, pieces of red and greenish shale, to- 

 gether with rounded chips of sandstone. 



The sandstones both above and below this stratum are 

 quite massive though few of them contain any pebbles, and 

 most of them are much current-bedded. 



The lowest member of the section has been quarried to a 



