494 MR. P. F. KENDALL ON A SYSTEM OF [Aug. 1902, 
altitude of the highest of these moraines at Bilbrough is rather over 
150 feet above sea-level. 
Glacial Striee. 
Down to the time when the geological maps and memoirs of the 
district were published, no Glacial striae upon the bed-rock had been 
discovered; but Mr. Barrow, in his memoir on North Cleveland, 
stated that at Hob Hill, near Saltburn, when the Drift was cleared 
away, ‘the Ironstone was found to be deeply grooved, the direction 
of these hollows running roughly north-west and south-east.’ The 
Drift here appears to have been recognized by him as Lower Boulder- 
Clay, an important fact. Mr. Barrow also mentioned that, ‘as a 
rule, where the clay is thin it is so largely made up of the underlying 
rock, or the rocks a little to the west’ (op. cit. p. 65) etc. 
Since that time, the geologists of the East Riding have taken up 
the study of the Glacial deposits with great earnestness, and the 
following observations of striated surfaces have been recorded :— 
Filey, Carr Naze (south side). G. W. Lamplugh. N. 20° E. 
Do. Do. (north side). J. W.Stather. N. 24° E. 
Bayness (north of Robin Hood’s Bay). H. B. Muff & T. Sheppard. N. 
Sandsend, near Whitby. J. W. Stather. N. 35° W. 
Roker, near Sunderland. P. F. Kendall. E.N.E. 
Reference should also be made to the striations observed in the 
coast-region of Northumberland, as they bear directly upon many 
of the problems relating to the glaciation of Yorkshire. 
The distribution of local materials in the Drift of the area under 
consideration is very significant, as Mr. Barrow has shown for 
the area north and west of Whitby. South of that town, I have 
observed the frequent occurrence along the coast of masses of 
Jurassic rock to the south of their native outcrop; but I have heard 
of only a single example that might be interpreted as indicating 
movement in the opposite direction, namely, Mr. J. W. Stathber’s 
record of blocks of Chalk at Scalby Mills, near Scarborough.’ 
Occurrence of Shells jn the Drift. 
Shells, mostly fragmentary, have been recorded from the Drift- 
deposits of various localities in the area under notice, except 
the western end of the Vale of Pickering. Mr. Fox-Strangways, 
speaking of the gravel which fringes the great escarpment to the 
east of Ingleby Arncliffe and runs up the dales opening off it, alludes 
to ‘hinges of Yellina balthica being very plentiful in this gravel.’ * 
Mr. Barrow, in the North Cleveland Memoir, mentions the occur- 
rence of the same shell at Rye Hill near Great Ayton (I also have 
found several fragmentary shells at this place); at Stanghow Moor, 
in sand resting on Lower Boulder-Clay (at an altitude of about 800 
feet); and at Whitby, in Lower Boulder-Clay. In the Eskdale 
1 Mem. Geol. Surv. ‘ North Cleveland’ 1888, p. 66. 
> Rep. Brit. Assoc. 1898 (Bristol) p. 554. 
3 Mem. Geol. Surv. ‘ Country around Northallerton’ 1886, p, 54. 
