286 _ MR. A. J, JUKES-BROWNE ON [May 1902, 
Thickness. Depth. 
Feet inches. Feet inches. 
‘Grey limestone’: no sample seen ...........2..4608 1 6 1032 
Blue, brown, grey, and red marls: sample from 
1050 feet a light-grey marl, somewhat cal- 
CAPE OUS E38 sin sdia wins on scine s'sicinyarcio see anoles tee REE ner 18 6 1051 5) 
Dark-blue marl, with gypsum: sample from 
1056 feet a greenish-grey marl ........ Aa a 10 6 1061 9 
Blue and red marls, with gypsum: small sample 
from 1077 feet is a hard argillaceous limestone, 
with a vein of black substance (? manganese- 
oxide), perhaps a concretion; sample from 
1100 feet a fine red sandiy marl) Vii a.c.se ieee 39 dl 1100 =10 
Dark-red and blue marl, with gypsum: sample 
from 1115 feet a hard dull-red clay, and one 
from 1130 feet massive, white, crystalline 
gypsum; sample from 1150 feet a hard red 
and variegated clayey rock | aces ia-eccs-<se ate: 60 9 1161 7 
Red and blue marls, with gypsum: samples from 
1200, 1213, 1230, 1237, & 1250 feet all hard, 
fine, silty and micaceous clays, those from 1213 
& 1230 feet grey, the others red; that from 
1213 contains a thin seam of hard grey sand... 93 9 1255 4 
Red and green marls, with gypsum : sample from 
1300 feet a hard, red, fine-grained, sandy clay 
or argillaceous silty stome... sec... :2sacseseontions 46 8 1302 0 
[V. Remarks ON THE CLASSIFICATION OF THE BEDS. 
There can be no doubt that the limestones and shales traversed in 
the first 70 feetform part of the ‘Blue Lias’ and belong to the zones 
of Anumonites Bucklandi, Amm. angulatus, and Amm. planorbis. 
The true ‘ White Lias, or Upper Rhetic, probably commences. 
between 72 and 76 feet, for in the coast-section (see p. 280) more 
than 20 feet is referred to this division; these white limestones 
extend to just over 95 feet. The boring then entered the shales of 
the Avicula-contorta zone, and these appear to extend to the depth 
of 183 feet 8 inches, having a thickness of more than 38 feet. 
Grey marls with thin limestones follow, but unfortunately I have 
not been able to see many samples of these beds. From the record 
ot the boring, grey shales and marls seem to have been met with 
down to 167 feet. Then comes what is described as ‘green shale,’ 
below which is a thin bed of ‘grey limestone’: of this I have not: 
seen a specimen, but if really a limestone it would form a con- 
venient horizon to take as the base of the Rhetic Group. If the 
base of this group be taken at the higher limit, the grey marls are 
351 feet in thickness, which corresponds very closely with Mr. Wood- 
ward’s measurements in the coast-section: if the Rhetic marls 
include the limestone, their thickness is 39 feet; and the total 
thickness of the Rheetic Group will then be nearly 100 feet. 
The boring then entered green and red marls that are undoubtedly 
of Keuper age, and for a depth of about 125 feet these are without 
gypsum. Then the usual gypsiferous series was met with, the gypsum 
in the higher beds occurring only in veins and strings, but lower down 
ee 
