22 OEOLOQY OF TITl! AVON BASTN, 



Limestone beds, probably Lower Limestone Shales, near 

 the base of the Mountain Limestone, dippirif,' 20° S.S.H 

 Farther down the lane more silicious beds cross the road 

 with a higher dip, while at the point niai-ked on the map 

 (Dry.), I found on both sides of the road evidences of the 

 Bi'yozoa bed. Yet fai'i.her down the lane wc come npon 

 ■ii good exposin-e of conglomeratic Old lied, with pebbles 

 of opaque white quartz, dipping 40° S. 



After thus finding characteristic Old Red at the lower 

 end of both these lanes, which will bo seen from tlie map 

 to lie one on eitlicr side of Fore ITill, it is sonic what sur- 

 prising to find that the hill itself is composed of Mountain 

 Limestone. The bods are very well exposed in a large 

 (piarry, which was opened out when tiie Portishcad Docks 

 were in process of construction. They arc characterized 

 by the occurrence of curious bands aiid nodules of white 

 Chert, which has in places replaced the Limestone, con- 

 verting the organic remains imbedded therein (mostly 

 crinoidal " ossicles," with some Spirifers) into hard Silica. 

 The beds dips at a unifoi'm angle of about 18° S.B. 



Standing upon Fore Hill, we see to the S.W., clothed 

 by Weston Big Wood, the eastern termination of the more 

 southei'Iy crest mentioned by Euckland and Conyboare, of 

 which the Limestone knoll upon which wc! stand seems like 

 an outlier. On this view, however, the steeply inclined 

 Old lied Sandstone in the lanes on either side of the hill 

 seems not a little puzzling. 



Before returning to the station wo may visit, first, a 

 large quarry in W(X>d Hill, whci-o tlio Old Red Sandstone 

 is well seen, dipping about 25° E.S.E., and then four or five 

 smaller quai'ries to tho west of it, on the slope ahove the 

 station, where bods of Ijowci- Limestone Siiales ai'O exposed, 

 with changing direction and angle of dip. In the more 



