387 
MIDDLE CHALK—SURREY. 
The Terebratulina Zone. 
The chalk of this zone shows no variation from that in Kent. 
The large quarry near the Rose and Grown Inn, four miles south 
of Croydon, exposes more than 70 feet of chalk in the upper part 
of the zone overlain by nodular chalk with flints (zone of H. 
planus). This quarry is mentioned by Mr. Whitaker* in his 
Geology of the London Basin. 
A mile further south, close to the Croydon and Oxted railway 
line, is a large quarry at Whiteleaf. About 70 feet to 80 feet of 
massively-bedded chalk is seen here. The lower part is firm 
white chalk, and is perhaps the highest part of the zone of 
Rhynchonella Cuvieri, for that fossil occurs with Galerites sub- 
rotundus ; the upper part is softer, but is without flints ; in this 
Spondyhts spinosa is a common fossil. This chalk is included 
in the Whiteleaf beds of Mr. Caleb Evans.t 
The middle part of the zone is exposed in a quarry about 1J mile 
E.N.E. of Gomshall, and much of the chalk of this zone is 
exposed at intervals in a lane cutting leading up White Down 
from White Down Brickyard. 
The Terebratulina chalk is again exposed in the upper part 
of the large quarry at Betchworth, and in 1897 Mr. W. P. D. 
Stebbing described two boulders of granitoid rock which are stated 
to have come from the Terebratulina, zone in this quarry. J Both 
were much broken before they came into his hands, and were found 
after a blast. The larger fragment weighed 7 lb. 7 oz., and con¬ 
sists of a fine-grained granite, which is very much decomposed: 
it bears the remains of several lower valves of Spondylus latus and 
some Serpulce. The other fragment appeared to be half of an ovoid 
mass, and weighed 3 lb. 12 oz. It is less decomposed and is a granite 
of coarser grain, and contains much white mica. 
The upper part of this zone is also seen in the “ Echo pit,” about 
a mile S.E. of Guildford ; and again in the Shalford quarries 
south of Guildford, where the section seen in 1897 was as follows : — 
ft. in. 
Soil, etc. . 10 
Broken chalk, rubbly ------- 20 
A layer of flints - -- -- -- - 06 
Rather rough lumpy chalk passing down into smooth 
white chalk, including a course of hard iron stained 
lumpy chalk. A few flints occur - - - - 20 C 
Smooth white, but firm chalk in courses 2 or 3 feet 
thick marked by thin marl seams - - - - 10 0 
A course of hard rough lumpy chalk showing structure 
of sponges and ventriculites in iron stains - 13 
Firm, almost hard, rather lumpy chalk with a few 
finger like flints -.- 46 
Firm white chalk - -- -- -- 9 0 
Marl band - -- -- -- -- 04 
Massively bedded white softish chalk seen for - - 20 0 
*Geology of the London Basin, W. Whitaker, 1872, Yol. i., p. 22 (from 
Mr. Drew’s notes). 
t On some Sections of Chalk between Croydon and Oxted, Geologists’ 
Assoc.. 1870, p. 17. 
X See Quart. Journ. Geol, Soc. Yol. liii. p. 213 (1897). 
4219. C c 
