AND THE AVON GORGE. 
183 
without any intervening Lower Limestone Shales. Such a 
state of things is impossible without a fault. And I can find no 
evidence of a fault or of this contact of Mountain Limestone and 
Old Ked. I have therefore in the map substituted my own 
interpretation of the facts at this spot. 
Thirdly, I have suggested a somewhat important alteration 
in the neighbourhood of King’s Weston. There are two little 
patches of rock there, one of which is marked in Sanders’ map, 
and by the Survey, as Old Red Sandstone, and the other as 
Mountain Limestone. With regard to the latter, there can be 
no doubt that of whatever age it may be it is not limestone. It 
is sandstone of some kind. With regard to the former, if it be 
Old Red Sandstone it is in a very puzzling position. If there 
be no fault, and none is marked on the Survey map, we must 
suppose that the Old Red Sandstone of the limestone ridge dips 
down under the ridge and then emerges on its N. side at King’s 
Weston. This, though possible, is not, I think, even in a slight 
degree probable. For if we look at the Survey, section No. 14, 
or the section given in fig. 4 of De la Beche’s Memoir, which 
passes through Blaize Castle, we shall see that the ridge of 
limestone is there regarded, and I am sure rightly regarded, as 
an anticlinal ; and it is difficult to believe that this steep 
anticlinal is converted into a deep synclinal at a distance of a 
mile or less. I have found evidences of what seem to me to be 
the Upper Limestone Shales in the Blaize Castle woods, and at 
Lawrence Weston. And I think myself that it is very probable 
that the King’s Weston beds will prove to be Millstone Grit, or 
those red sandy beds which occur in the Upper Limestone 
Shales near their junction with the Millstone Grit. The 
absence of conglomeratic bands and of friable red sandstone 
seems to distinguish these beds from those of the Old Red 
series. At the same time the beds are in places micaceous, a 
character which marks the Old Red. I have not yet worked 
