igS PROCEEDINGS COTTESWOLD CLUB igii 



Geographical Extent of the Rocks Described. — The 

 sketch-map given above (figure i) does not show the geo- 

 graphical distribution of the several formations present in the 

 district. It is only intended to indicate precisely the positions 

 of the sections to which reference is made — the numbers in 

 the text corresponding to those on the map. For the geology, 

 and for seeing the approximate geographical distribution of 

 the rocks, the Geological Survey Maps must be consulted ; but 

 it should be noted that on the two quarter-sheets, 45 N.W. 

 and 45 S.W., the equivalent beds between the Clypeus-Gnt and 

 typical Great Oolite are not similarly coloured, for reasons that 

 need not be entered into here, as they have already been fully 

 explained elsewhere.' Also, here and there, patches of higher 

 beds than any originally suspected, such as of Forest Marble 

 and Cornbrash, have been discovered f but considering the 

 time at which the cartography was done, the small scale 

 Ordnance Survey maps available, and the knowledge possessed, 

 it is extraordinary that it was done as well as it was. 



The Lower Lias floors the Vale of Moreton, the Evenlode 

 Valley and the broad ends of the little valleys that run into 

 the upland from the vale. 



(i) The Capricormcs-'Beds were exposed when the tunnel at Chipping 

 Norton (No. i on the map) was made :" 



(2) In a temporary excavation near Churchill Mill (2 — L.R., 1904) : 



(3) The Armatus-Beds or thereabouts were seen in the railway-cutting 



near Charlbury :* while 



(4) Lower Lias, of uncertain date, was laid bare in the railway-cutting 

 at Ascott-under-Wychwood.'' 



The Middle Lias succeeds the Lower, and admits of the 

 usual dual division into {a) a lower, sandy, shaly, clay portion, 

 and {b) an upper or Rock-Bed (Marlstone) portion. 



The sandy beds of the Middle Lias can be easily located by means 

 of their usually-attendant gorse-bushes ; and the Marlstone, on the vale 

 side, by the platforms — such as " Wichford Hill" — to which it gives 

 rise. Around Hook Norton, the red, light level-land, and the numerous 

 long workings, indicate clearly enough the presence and geographical 

 extent of this Marlstone ; while its ferruginous character is emphasized 

 by the presence of continuously smoking furnaces (figs. 2 and 3). 



1 " The Jurassic Rocks of Britain, etc." vol. iv. (1894), pp. 146-147. 



2 Proc. Geol. Assoc, vol. v., No. 4 (1877), p. 177. 



3 Ibid., pp. 180-185. 



4 E. Hull, " The Geology of the Country around Woodstock " (1859), p. 9. Mem. Geol. Surv. 



5 W. S. Horton, " The Geologist," vol. iii. (i860), p. 251. 



