Tercij F. Kendall — Glacial Geology. 493 



tban it deserves. The careful surveys made by Messrs. Lomas, 

 Dwerryhouse, Piatt,' Mackintosh, and others, bring out very clearly 

 the great preponderance of Lake District rocks on the eastern side 

 of the area and of Scottish rocks on the western side. 



The transport of local stones is easy of definition over the major 

 part of the area. There is a small number of rocks in South 

 Lancashire and Cheshire whose outcrops are so restricted that 

 peculiarities of their distribution can be studied with great facility. 

 I take three examples. 



1. Thin Permian Limestones, crowded with Bakevellia, crop out 

 along the northern edge of the great Permo-Triassic basin near 

 Leigh and Patricroft, Lancashire. Boulders of the rock are found 

 at Stickins Island, on the Manchester Ship Canal. Another outcrop 

 runs through Manchester-Salford, and boulders appear on the eastern 

 side. A third outcrop has been discovered in the neighbourhood of 

 Stockport, and again to the eastward boulders of the rock appear in 

 the Drift deposits. I personally drew the attention of a party of 

 the Liverpool Geological Society to the Manchester Ship Canal 

 specimens, and one and all declared they had never seen such a rock 

 in the Liverpool district, 



2. In the Upper Coal-measures of the Manchester Coalfield, 

 peculiar limestones crowded with Spirorbis occur. The outcrops 

 are very restricted, but run in a N. and S. line, down to about 

 Heaton Chapel, near Manchester. Now, not only have we (and 

 Mr. Eeade is amongst the observers) seen in a long, open section 

 streams of boulders trailing away through the Boulder-clay to the 

 eastward froin each outcrop, but sporadic boulders have been found 

 at Apethorne Mill, Hyde ; at Buckley's Mill, Woodley, and at 

 Glossop. Not one scrap has been found to the northward or west- 

 ward of the parent mass. 



The Millstone-grit boulders display the same peculiarities. In. 

 the Liverpool district admirable work is being done in the mapping 

 of Boulders, and in the report on Erratic Blocks presented to the 

 Edinburgh meeting of the British Association, a series of upwards 

 of 400, being all those visible along several miles of the Mersey 

 shore-line, has been recoi'ded by Messrs. Lomas and Dwerryhouse, 

 and among them there is not a single block of Millstone-grit. A 

 similar list for the Rochdale area, by Mr. Piatt, shows a very high 

 percentage of boulders of that rock. In my own experience in 

 south Lancashire and Cheshire I have met with but two, viz., one 

 in Manchester (Denmark Eoad), and one at Portwood, Stockport. 



What is the reason for this very partial distribution ? The " anti- 

 submerger" <would point to the fact that the ice-movement has been 

 from the N.W., and that whereas to the N.W. of Hale Head there 

 is no Millstone-grit above sea-level, there is a very large outcrop of 

 the i-ock to the N.W. of Eochdale. 



These and other cognate facts were in my mind when I declared 

 in a paper quoted by Dr. Crosskey, in the 18th Eeport of the British 

 Association Committee on Erratic Blocks : " Boulders in this district 

 1 Brit. Assoc. Eeport on Erratic Blocks, 1890-92. 



