216 
Sandstone is for the most part covered up with gravel ; but 
it may be seen exposed superficially near the railway a little 
to the east of Snaith Station. On a smaller patch of the Red 
Sandstone rock, separated from that last-mentioned by the 
River Aire, the villages of Carlton and Camblesforth are 
fiituated ; and the Red Sandstone may be seen on the surface, 
in sand pits near Carlton. There is another small detached 
patch at Whitley. West of Selby the Bunter rises into two 
little hills — Brayton Barf and Hambleton Haugh — each 
about 150 feet in height. Around the base of these hills the 
Red Sandstone is covered with gravel ; but it is well 
exposed in a quarry on Hambleton Haugh, and again at 
Thorpe Willoughby. The Bunter is also struck by deep 
borings at Reedness (Section 3), Goole (Sections 5, 6 and 8), 
Rawcliffe (Sections 9, 10 and 11), Selby (Section 13), 
Osgodby (Section 15), &c. Borings at 'New Bridge, near 
Snaith, have penetrated into it 450 feet (Section 12), and 
at Reedness 687 feet (Section 3), without reaching the 
bottom. At Cawood a soft Grey Sandstone 240 feet and 
more in thickness is said to have been met with (Section 
14), which is probably the same rock. The usual charac- 
ter of the Bunter in this district is a loose red sand, or 
friable semi-coherent red sandstone, often micaceous, with 
more coherent clayey bands, and with occasional partings 
or pockets of red, green, or yellow ochrey marl. Unfor- 
tunately it contains neither fossils nor beds recognisable 
by constant physical characters, so that it is impossible to 
correlate one section with another. It is always strongly 
current-bedded. 
Upon the Triassic rocks rest the Post-Tertiary beds, which 
are the especial subject of my paper. The aggregate thick- 
ness of the latter, as proved in the deep borings of which 
I have been able to obtain records, has been found to be 
as follows : — 
