MIDDLE CHALK—YORKSHIRE. 
489 
bottom being probably very near to the junction with Lower Chalk. 
The beds seen are as follows : — 
ft. in 
fflocky chalk much broken into angular fragments, with 
layers of grey flint nodules - - - from 10 to 12 0 
Buff coloured marly chalk, including lenticular layers of 
harder chalk --------- O' 8 
Hard whitish chalk full of fragments of Inoceramus shell - 2 3 
Layer of marl -.03 
Hard rough nodular chalk, Rhynchonella Cuvieri - - 1 9 
Thin layer of marl - - - - - - - 02 
Course of smoother chalk, hard and white - - - -10 
Thin layer of marl - 0 1 
Massive course of rough nodular chalk, containing 
Inoceramus mytiloides and Rh. Cuvieri - - - 3 3 
Layer of yellowish grey marl - - - - - -00 
Smooth hard white chalk ----- seen for 2 0 
_ 
About 24 0 
Mr. Hill has also recorded a section through the base of this zone 
in a pit about a mile south-east of Londesborougli; * this, with the 
wording slightly altered, reads as follows : — 
ft. in. 
Soil and rubble - - - - - - -16 
Hard whitish platy chalk, in rather thin beds, with 
some flints - - - - - - - 3 0 
Creamy white chalk, in thick massive beds, divided 
by thin seams of marl - - - - -66 
Hardish smooth white chalk, from 10 inches to 1 0 
A marked layer of marl - - - - - 0 3 
x ^Hard smooth creamy chalk - - - -20 
Belemnite Softer marly chalk of creamy yellow tint - - 1 6 
Marls. VGrey shaly marl, darkest in the centre - - - 1 6 
Mr. Fox-Strangways mentions a quarry “ between the two valleys 
at Londesborough,” where the junction of the chalk without 
Hints and that with flints is exposed, “ the line being marked by a 
peculiar band which weathers in vertical lines, giving the bed a 
columnar aspect/' He identifies this band with that which occurs 
at the base of the flintv chalk in Lincolnshire, a view which 
suggests a recurrence to the condensed Lincolnshire type, but one 
which requires confirmation in the light of subsequent observations. 
The whole of the Middle Chalk comes into the cliffs east of Speeton 
Gap, but very little of it is accessible. Mr. Hill has given the follow¬ 
ing description of its base where it is first accessible, near the place 
known as Nanny Goats Housef : — 
ft; 
Hard white chalk with flints. 
Whitish bedded chalk, very hard and crystalline, wflth 
Inoceramus mytiloides - 5 
Courses of creamy white chalk, about 6 inches thick, divided 
by buff-coloured marl-bands - - - - - - 21- 
Lower Chalk (see p. 234.) 
* Quart. Journ. Geol. Soc., Vol. xliv. p. 346, 1888. f Op. Cit. p. 345. 
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