10
References
Boswell, P.G.H. 1925 The Evolution of the East Anglian River Stour Journal of the
Ipswich and District Natural History Society Vol. 1 pp.7-36,
Ellison, R.A. 1986 Geology of the Country around Braintree. British Geological
& Lake, RD. Survey Memoir for Sheet 223.
Sumbler, M.G. 1996 London and the Thames Valley. British Regional Geology
4th Edition
Summerfield, M.A. 1979 Origin and palaeoenvironmental interpretation of sarsens.
Nature 281 (5727) pp.137-9.
Summerfield, M.A. 1980a The sarsens of southern England; their palaeonenvironmental
& Goudie, AS. interpretation with reference to silcretes. In Jones, D.K.C.
(ed ) The shaping of southern England.
Summerfield, M.A, 1980b Petrographic investigation of sarsens (Cenozoic silcretes)
& Whalley, W.B. from southern England Geotogie Mijnbouw Vol 59 (2)
pp.145-53.
Whitaker, W. 1885 The Geology of the Country around Ipswich, Hadleigh and
Felixstow.
W.H. George
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Essex Field Club Newsletter No. 22, August 1997