224 
obtained from the former. Grey Marls separated these beds 
from the Cotham Marble or Landscape Stone about Tin. 
thick. The upper surface especially corrugated and nodular. 
Above this came the rubbly broken up beds of the White Lias 
proper, very fossiliferous in their lower portions, containing the 
usual characteristic fossils—Ostrea intusstriata, Lima precursor, 
Pecten Valoniensis, Modiola minima, Myophoria postera, Pleurophorus, 
Axinus, Nucula, &c. The Gasteropoda occur principally in casts 
and difficult to make out, but a Cerithium, Turvitella and Trochus 
could be distinguished. These were followed by the more solid 
beds of the White Lias to the top of the section. Owing to the 
fissile nature of some of these above the two lowermost beds, 
and their long exposure to the weather, thin sheets easily split 
off and exposed some excellent impressions of shells both obverse 
and reverse. The Monotis or Avicula decussata was remarkable 
for its good preservation. The usual creamy ‘ Sun bed” of 
William Smith cropped conspicuously out on the top, and was 
stained a ferruginous colour on its surface, on which rested a band 
of arenaceous shale, containing Ostrea liassica, &e., indicating 
another change from the comparatively clear and deep waters at 
the bottom of which the “Sun bed” must have been laid down 
to those of a shallower and more rapid character. This arenaceous 
band invariably separates the White Lias in our neighbourhood 
from the grey and blue beds of the Lower Lias above. At one 
end of the section an exposure of about 2ft. 4in. of thin 
Lower Lias Lima beds came in above this arenaceous band, 
but the beds throughout have been so much tumbled about by 
the slipping of the bank, and small dislocations, that it was 
difficult to get a continuous section from the New Red to the 
Lower Lias beds consecutively, so that the measurements had to be 
made at various portions of the section that were most accessible. 
The thickness of the various beds will be found to agree in the 
main with the different sections of the White Lias developed in 
the neighbourhood, and described by the late Charles Moore 
and myself elsewhere. 
