dot MR. P. F, KENDALL ON A SYSTEM OF | Aug. 1902, 
times, and through one of these a great overflow was cut which 
must have played an important part in the stages of advance and 
retreat of the ice-front, when small lakelets were held up in 
numerous re-entrant angles of the hills. This valley is that through 
which the railway passes from Seamer to Scarborough. 
The way in which it expands towards Scarborough shows that 
it is not, like Forge Valley, entirely the result of Glacial stream- 
erosion, but that a pre-Glacial valley existed with a northerly 
outlet. At present it is quite streamless, and an artificial pool, 
| the Mere, occupies a 
Fig. 25.—Borinys at Scarborough Gasworks. position near the 
watershed which is 
W. Jae roughly 135 feet above | 
—— Top Soil. sea-level, but there is’ 
eee Light Coloured Clay. a good deal of peaty 
sii,| Voamy Sand and! Gravel material im dhemuonr 
and the actual rock- 
Ga s a Gravel d e ES i 
re lipaidetetagl floor is probably con 
Boulder Clay . + 1 
tard Sandstone Roce. —«Sierably lower. 
Now, with an out- 
==)Blue Bind Rock with 2 
. £2=|hands of Shale. ra gee a mene ’ 
= T o 
Boulder Clay y orge a cy and 
SE by the Seamer valley, 
= =|Blue Shale with bands the drainage of the 
===|of Sandstone Rock 
: recess at Scarborough 
must necessarily have 
1 Groy Shale; bands ‘of been very liable to 
223] Sandstone Rock. reversal, according as 
some slight fluctuation 
of the ice-margin freed 
the one or the other 
outlet. This fact was 
strongly borne in upen 
ScatePee fe MO IN, WOrkine woven 
the ground. Lake- 
overflows are numerous, but no clear system can be recognized ; 
for, not only may two overflows in the same spur drain in opposite 
directions, but even one and the same channel bears evidence of 
flow at one time to the northward to the Forge overflow, and at 
another southward to Seamer. I will speak of some of these 
in detail. 
The outstanding shoulder of Cornbrash beyond the north-eastern 
corner of Row Brow, near the village of Throxenby, is deeply 
trenched by a fine overflow in which. Throxenby Mere has been 
Ordnance Datum -—= 
1 Since this was written I have been furnished, by the courtesy of Mr. Crawford, 
manager to the successors of the late Mr. G. Smalley, well-sinker, of Hull, with 
details of three boreholes put down at the Scarborough Gasworks, which are 
situated about 1500 yards north of the watershed, and stand at a surface- 
altitude of about 115 or 120 feet O.D. Fig. 25 shows the details of these 
borings, which furnish complete corroboration of my surmise, and further 
reveal a very remarkable cliff-like sub-Glacial declivity. 
