205 
the waters of the rainfall. It is from the circumstance that 
these corresponding beds of the Upper Lias at Churchdown 
or Chosen Hill are of such a slight thickness, together with the 
 jimited area of the catchment forming the upper strata, that 
the water supply of Churchdown is so often deficient, and 
occasionally on the S.E. side of the hill and around it the 
ground is at times really parched up. 
The section of the Upper Lias clays indicate on the top 
6 ft. of Buff and Gray clays, and at the base, lying on the upper 
rocks of the Spinatus Zones, 4ft. 6 in. of Leptena clays. In 
both instances the fracture is conchoidal, a fact attributed to 
impressed force from above acting upon the mass of clay when 
it contained next to no moisture, approaching to a rigid con- 
dition of the substance. In any case, the conchoidal fracture 
would imply a changed set of conditions, tantamount to such a 
break inferred from paleontological proof, which latter would 
signify lapse of time. / 
PALHZONTOLOGY 
The following tables of the fossils of the Alderton section, 
although procured in the face of difficulties, are fairly repre- 
sentative. Of the leading genera some few only of the five 
ammonites that now assert themselves for the first time are 
here entered. Access to the faces of the shales having barred 
_ our work upon the “ Paper shales.” 
~ 
(SEE OVER) 
