ADAMSON: THE YORKSHIRE BOULDER COMMITTEE. 305 



No. 4 is 2 ft. x 2 ft. x 1 ft.; the two latter were excavated in the 

 railway-cutting passing through the same field. 

 All the above are Basalt. 

 There is also a block of siliceous Limestone i ft. 6 in. x i ft. x i ft. 



REPORTS UPON ERRATICS ON THE WEST OF THE 

 YORKSHIRE PENNINES (SOUTH-WEST RIDING OF YORKSHIRE). 



WM. WATTS, F.G.S., 

 Piethom, Rochdale; Engineer to the Oldham Corporation Waterworks. 



The Strinesdale Valley. 

 GROUPS OF BOULDERS. 



There is a large variety of boulders intermixed with Boulder 

 Clay and the upper gravels. Silurian grits predominate, then the 

 Syenites from the Lake District ; also Mountain Limestone, 

 auiartzites and trap. Along with these are local grits, mostly 

 ganister, all of which are much rounded, especially the smaller ones, 

 and many are striated. The Erratics are not large, 2 ft. x 2 ft. x 

 1 ft. 6 in. being a fair average. They are well rounded, a few are 

 sub-angular, but I have not found any quite angular. Some are 

 striated on one side. The pebbles are numerous, almost legion, 

 foreign and local, making a splendid gravel but for some black shale 

 intermixed. 



Note. — As you ascend this valley, the right hand is in the 

 South-West Riding of Yorkshire. The hills rise to an altitude of 

 nearly 1,200 ft. above sea-level. The area examined lies between 

 the 740 ft. and S30 ft. Ordnance datum. Character of strata — 

 Lower Coal Measure Shales. Physical features. — Gently sloping 

 valleys and rounded hills. 



The Denshaw Valley. 



I found a number of boulders at New Year's Bridge, 940 ft. 

 above sea-level. They averaged 2 ft. 6 in. x 1 ft. 9 in. x 1 ft. 6 in., 

 and consisted of Syenites and Diorites. I have found no traces of 

 striae on any of the boulders, which are all rounded, except one or 

 two. I found no isolated boulders. 



Notes. — This valley is carved in the Third Grits of the Millstone 

 Grit series. The hills rise to an elevation of 1,500 to 1,600 ft. above 

 sea-level. The valley in the main is deep and tortuous, and the 

 hills mostly saddle-backed. 



Oct. 1880 u 



