OF NOKTH OXFORDSHIRE AND THE CLTPEUS-GRIT. 



233 



by separated valves. of Rhynclionella cynocephala from my own cabi- 

 net, and Terebratula simplex from that of Mr. T. J. Slatter, F.G.S. 

 It would appear as if there are here some remains of beds of a lower 

 zone, or of material derived from them, though the section is 

 unfortunately so small as not to allow satisfactory determination. 

 The fauna of series B and C of Hook Norton is very similar, except- 

 ing, however, the last-named species. 



A little higher up the hill a sand-pit exposes the plant-beds, D ; 

 and in the roadside quarries nearer Great Rollright the ridge is 

 crested with beds of sandy siliceous limestones representing series E. 

 Attention must here be called to the fact that at the north end of 

 the ridge called Otley Hill, immediately above the Upper Lias, is the 

 outcrop of the so-called " Northampton Sands " (Hook-Norton type), 

 whilst two miles further south-westward, on the north and south 

 flanks of the part called Bright Hill, whereon stands the well-known 

 circle of the Rollright stones, crops out the Clypeus-Grit (Cotteswold 

 type), richly stored with its characteristic fossils and resting also 

 upon the Upper Lias. 



At Whichford, about two miles west of Otley Hill, a roadside 

 quarry yields Astarte elegans &c. At the Grayton pit, further 

 up the hill, the higher beds are extensively worked, and a stratum 

 abounding with separated valves of Trigonia signata can be clearly 

 traced. The section as measured is : — 



ft. in. 



1. Humus 1 



2. Cream-coloured siliceous limestone 6 6 



3. Sanely limestone with T. signata, passing into No. 4 10 



4. Blue-hearted limestones, with wood ; base not shown 3 



Fig. 2. — Vertical Diagram Section, Sharpshill, 

 Otley Hill (Scale 1 : 144.) 



1^ mile JV~. of 



Great Oolite 

 Marls and clays. 



E. Siliceous Limestone 



E. Siliceous Limestone 



D. Sands and Limeston 



C. Oolitic earthy Limestone 



Trigonia signata and sp. 

 Monodonta Labadyei. 

 Amm. Parkinsoni. 



Gervillia Icevis, Avicula braambu- 

 riensis, Ostrea Knorrii, and Tri- 

 gonia costata. 



Chipping Norton. — Upon taking to the Chipping-Norton road and 



descending the hill to the Dip valley, one notes, in the fields to the 



Bridge, the outburst of springs marking the 



north-west of Langdon 



