Vol. 68.] GLACIATION OF THE BLACX COMBE DISTEIC'I. 409 



on the highest ground, prove that the direction of flow was main- 

 tained for about a mile, after which it turned southwards owing to 

 pressure of ice moving in that direction. The hill-slope, between 

 the 400- and 700-foot contours, north-west of Duddon Bridge, 

 consists of a series of scarps which have been polished and 

 striated so that the hillside is now practically one gigantic roche 

 mo u tonne e, the movement having been obliquely upwards. 



Trails of boulders descend the eastern slope of the Black Beck 

 Valley about 2 miles north of The Green, and in some cases cross 

 to the other side. A boulder of the coarse rhyolitic breccia which 

 occurs in situ at 600 feet was found lialf a mile away, on the 

 west side of the valley, below the 500-foot contour, the direction 

 of transport being in direct alignment with the striation on the 

 parent rock. 



The Coniston-Broughton ice crossed the Duddon Estuary, over- 

 rode the high ground near Lady Hall, and choked the Black Beck 

 Yalley near The Green with several large drumlins. 



From Duddon Bridge to Lady Hall the lower slopes on the west 

 of the estuary have been over-steepened and all spurs cut away. 

 On the higher ground the rock is scored by glacial grooves, and 

 many perched blocks, ranging up to 12 feet or more in greatest 

 diameter, are scattered about. A boulder of banded ash, measuring 

 8x6x5 feet, resting on a smoothed surface of cleaved ash, occurs 

 by the roadside a few yards north-west of Haws near The Green. 



South of The Green, glacial grooves and splendid roches 

 moutonnees clearly indicate that the direction of movement of 

 the higher parts of the Duddon ice was south-westward, until 

 contact with the Whicham- Valley ice caused it to take a more 

 southerly course along the eastern slope of Millom Park. Farther 

 south it was affected by the Irish- Sea ice. 



Boulder-clay is frequently exposed at low levels between Duddon 

 Bridge and Lady Hall : it also occupies the hollows on the higher 

 ground to the west, and is plastered round the smoothed rock- 

 surfaces. 



About 400 yards south of the Inn, at The Green, is a 20-foot 

 (artificial) section in one of the above-mentioned drumlins. The 

 deposit consists of a more or less homogeneous broAvn clay or loam, 

 sometimes slightly reddish, and contains streaks of reddish-brown 

 sand or fine gravel, which dip gently in both directions along 

 the line of section, that is, transverse to the long direction of the 

 drumlin. The larger boulders are 3 or 4 feet long, and consist 

 chiefly of Borrowdale lavas and ashes or pinkish quartz-porphyries. 

 Some of the smaller boulders of sedimentary rock, such as greenish- 

 blue shales, micaceous slates, and micaceous banded grits, are fre- 

 quently striated. These rocks, and a few small boulders of rotten 

 Coniston Limestone, suggest the Coniston-Broughton district as 

 their seat of origin. 



A second pit in the same drumlin shows a similar section of 

 brown, slightly loamy clay — a true till — overlain by tawny sand with 

 boulders on the hill-slope. Boulders of Coniston Limestone were 



2g2 



