54 SOME ESSEX WELL SECTIONS.
This section is of interest as showing two unexpected things: —
the presence of a lower bed of Boulder Clay (beneath the Glacial
gravel), which does not come to the surface hereabout; and an
extension of Reading and Thanet Beds northward, along the
valley of the Pant or Blackwater, beyond the limit to which they had
been guessed to reach. The brownish sand with a pinkish tint
reminds one of the pale pinkish bed above the green base-bed of the
Thanet Sand at Sudbury, and proves therefore a westerly extension
of that division of the Lower London Tertiaries.
Mistley.—For Messrs. Rodwell, Free & Co. 1891.
Boring, made and communicated by Mr. F. Bennett.
On a level with the quay, which is about 30 yards off.
Water-level sinks 20 inches at low tide.
The steam-pump was throwing considerably over 6,500 gallons
an hour, and although we pumped for several hours, the supply
seemed to be abundant. The water drops about 2 feet, and then
remains at a fixed level of 14 feet 4 inches from the surface. (Letter
from Messrs. Rodwell, November, 1891.)
Ovington.—Public Well. By the roadside, near the Rectory. 1891.
Made and communicated by Mr. G. Ingold.
Shaft 95 feet, the rest bored.
Water-level 1021/2 feet down.