158 PROCEEDINGS COTTESWOLD CLUB 1903 
from the fact that there are several Westburys in the 
Kingdom, but only one Penarth. Prof. T. R. Jones in 
his paper “On the Rhezetic and some Liassic Ostracoda of 
Britain,”* reproduced Brodie’s section of 1845, and dealt 
with the Ostracoda. 
b.—Detailed Description of the Section. (Table III.) 
Below the Rhetic strata in this section there are visible 
18 feet of “‘ Tea-green Marls,” and about 73% feet of red 
marls. The latter deposit contains zones of grey, greenish- 
grey and bluish marls, with intervening variegated bands. 
It is noticeable that the marl composing the “green” 
zones is often imperfectly laminated. The fracture is 
mainly angular, less commonly conchoidal and cuboidal. 
Very thin veins of gypsum traverse the marls vertically. 
About 5034 feet below the base of the Rhetic is a band 
18 inches in thickness of alternating layers of red and 
greenish marl, somewhat thinly laminated, slightly 
arenaceous, and ripple-marked. 
At about 7% feet above, and at 2% feet below that 
horizon, the marls are again considerably arenaceous, the 
arenaceous matter occurring in lamine; but no organic 
remains were observed. Etheridge assigned a thickness 
of only 16 feet to the above marls.* 
The “ Tea-green Marls” are 18 feet in thickness, the 
lowest 3% feet, being a fairly hard band of marl weather- 
ing whitish. The “ Tea-green Marls” are of greenish-grey 
colour, but weather yellowish-grey white and bluish-grey. 
The Rhetic portion of the section runs N.N.W. and 
S.S.E., the dip being in the latter direction, with an incli- 
nation of about 9°. 
The change from the Upper Keuper to Rhetic con- 
ditions is marked by a conspicuous and _ interesting 
r Quart. Journ. Geol. Soc., Vol. 1. (1894), p. 157. 
2 Proc. Cotteswold Club, Vol. iii. (1865), p. 220; also Trans. Cardiff Nat. Soc., 
Vol. iii. (1870-71), p. 52. 
