It would thus appear that since the accumulation of the boulder-clay a gradual amelioration of climate has taken place; but the change from Arctic conditions has evidently been less decided on the ...
ON the above railway, now being constructed, there is a section of unusual interest a few yards north-east of the church at Hornchurch, showing the Chalky Boulder Clay (15 feet seen) under sand ...
This is an area of weak boulder clay. Salt marshes may be formed behind a spit. The zone behind a spit becomes a sheltered area. Water movement slows down and so more material is deposited.
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