48 SOME ESSEX WELL-SECTIONS.
The Little Sampford section is of more local interest, as pointing
to an error in the Geological Survey Map (Sheet 47); one of those
errors that can only be found by such borings, in a tract where the
Chalk and the Tertiary beds are covered by a thick mantle of Drift.
Unless otherwise stated the figures stand for feet.
[Words in square brackets have been added by the writer.]
Arkesdon.—Public Well. 1877.
Made and communicated by Mr. G. Ingold.
Water-level 69 feet down.
Barking.—Glenny's Brewery. 1889.
Made and communicated by Messrs. Legrand and Sutcliff.
Water-level 17 feet down.
There is a difficulty in fixing the base of the London Clay, and
perhaps the lowest bed classed with the Woolwich Series, may
belong in part to the Thanet Sand.
Berden.—[Bearden on the old Ordnance Map, Sheet 47.]
The Hall. 1884.
Made and communicated by Mr. G. Ingold.
Water 122 feet down.