Excerpt from The Geology of the Country Around Felixstowe Ipswich
The area to be visited by the Association at Whitsuntide and described in this pamphlet constitutes the north-eastern portion of the London Basin and comprises those parts of south-eastern Suffolk and north-eastern Essex lying south of the R. Alde, north of the R. Colne, and east of the R. Brett. It thus includes the Suffolk and Essex coastline from Aldeburgh to Walton-on-the-Naze.
Throughout the greater part of geological time, East Anglia appears to have been a land area, and the key to its Tertiary geological history lies in its condition of instability during Cretaceous and post-Cretaceous times.
Older Pal?ozoic rocks are reached in many borings at the moderate depth of about 1,000 ft. If the records of the borings made at Lowestoft, Culford (near Bury St. Edmunds), Stutton, Harwich and Weeley are combined, an idealised vertical section such as fig. 1 can be drawn. The Pal?ozoic rocks are slates and mudstones of Cambrian (?), Ordovician (?) and Silurian (?) age, the few fossils found being of little determinative value. These rocks are overlain by Gault in south-eastern Suffolk and northeastern Essex and by Lower Greensand in northern and northeastern Suffolk.
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