488 DR. HENRY WOODWARD ON EAST ANGLIAN GEOLOGY. 
Counties Coal-boring Association put down a trial boring atStutton, 
which gave the following section viz : — 
ft. in. 
River Gravel ... ... .. 16 0 
Loudon Clay and Reading Beds ... 54 0 
Chalk ... ... ... ... 874 6 
Gault ... ... ... ... 49 6 
994 feet. 
The greatest known thickness of Cretaceous Rocks in Suffolk, 
viz., 924 feet, was found here. 
Palaeozoic rocks were reached at depth of 994 feet, these were 
penetrated to a depth of 531 feet. The bore was carried down to 
a depth of 1525 feet. The consulting Geologist and the Mining 
Engineer-expert are agreed that the rocks reached are older than 
the Coal-measures (Geol. Mag. 1896, p. 95). 
The old rocks reached are represented by a slaty rock, possibly 
Silurian, possibly Cambrian, but no fossils have been observed in 
the cores (an Ortlwceras has since been found in one of the cores 
by Professor W. W. Watts). 
Prospects of finding Coal under East Anglia. 
Un the probable discovery of Coal. The finding of rocks, older 
than the Coal-measures at Culford, Stutton, and Harwich, does not 
demonstrate that Coal-measures cannot be found under the Eastern 
Counties, for it should be borne in mind that not far from the very 
ancient rocks of Charnwood Eorest the Leicestershire Coal-field 
occurs ; and again quite close to the old Cambrian rocks of Nuneaton 
we find the productive Warwickshire Coal-field. 
lleyond the outcrop of the lower beds of the Cretaceous series 
in Cambridgeshire and Norfolk, we find a powerful development 
of the great Jurassic series, but in the only three recorded deep 
borings in Essex and Suffolk that have pierced through the 
Cretaceous base, viz., at Harwich, Culford, and Stutton, not a trace 
of anything Jurassic has been met with, the borings pass suddenly 
from Cretaceous into far older rocks [Whitaker, Geol. Mag. 1895, 
p. 466]. 
Thickness of Chalk at Norwich. 
Messrs. J. & J. Colman’s well-boring at Carrow proved the 
Chalk to be 1152 feet; Greensand 6 feet; Gault 36 feet= 1194 feet. 
At Stutton boring, Chalk 874 ft. 6 in. ; Gault 49 ft. 6 in. = 924 ft. 
