GEOLOGICAL NOTES HOG
HIGHLAND
Since the publication of (Trans. Vol. X. Part I pp. of the hill have become obtained from the boring
the article on Hog Highland, Ipswich 40 - 42) details of borings at the foot available. The following data were crew.
Between 5 ft. and 14 ft. 6 ins. below present ground level; running sand. This is the water bearing sand which caused the attempt to bore by hand to be abandoned. From 1 4 | ft. to 23 ft. ; dark greenish Sandy Thanet Clay. At 23 ft. ; surface of chalk. This information agrees with observations of the outcrop on the shore which could be seen before the construction of the first stage of Cliff Quay. T H E BURIED CHANNEL AT SEVEN ARCHES BRIDGE
Two bores have recently been made, one at each end of the Seven Arches Bridge, London Road. Drilling began a little above high tide level and as no solid cores could be obtained by the method of boring adopted no truly accurate assessment of the strata can be given. On the south side the bore was taken to 100 feet without reaching the Chalk and on the north side no Chalk was found at 110 feet. At the bottom the Channel is unquestionably filled with the Chalky Jurassic Boulder Clay deposited at the close of the second glaciation. Most of the Channel appears to be filled with alternating beds of grey sand with abundant chalk grains and thinner zones of silty clay. The whole of this Alling must have been derived from the washing of the Jurassic tili as the ice was retreating. It is unfortunate that the high cost of drilling prevents work continuing until the chalk is reached. At Glemsford the bottom of the Channel was at 471 feet, with 218 feet of Boulder Clay in addiion to other types of deposit. H. E. P.
SPENCER.