I30 PROCEEDINGS COTTESWOLD CLUB 1913 



(25) and (26) on the map. At (27) a temporary excavation 

 revealed Upper Lias (near to the base of the Stage) with 

 numerous ammonites belonging to the genus Dadylioceras. 

 At (28) blue clay is exposed. 



Water. — See page 132. 



Commercial Uses. — The sandy clay from (24) has been 

 used to " lighten " the clays at the Cotswold Potteries. 



Inferior Oolite. — The freestone, which is obtained for 

 building-purposes from the large quarries on Leckhampton 

 Hill, and the Ragstone, which is drawn from the shallow- 

 workings on the summit, both belong to the Inferior-Oolite 

 Series. 



The following are the subdivisions of the Inferior Oolite 

 at Leckhampton Hill and Charlton Kings Common, with their 

 average thicknesses.' 



Ft. Ins. 



I.-III. Clypeus-Grit 



Non-sequence. 



VI. Upper Trigonia-Ght : seen . . . . . . 5 o 



Non-sequence. 



XI. Notgrove Freestone . . . . . . . . 2 10 



XII. Gryphite-Grit 4 11 



XIII. Buckmani-Gnt . . . . . . . . 16 o 



XIV. Lower Trigonia-Grit . . . . . . . . 7 4 



XV. Snowshill Clay (present only on Charlton Common). 

 Non-sequence. 



XX. Upper Freestone . . . . . . • • 32 o 



XXI. Oolite Marl 10 o 



XXII. Lower Freestone . . . . . . . • 77 9 



(a) The Freestone. 



{b) The Roestone. 



XXIII. -IV. Pea-Grit and Lower Limestone . . . . 38 o 



XXV. Scissiim-'Beds . . . . . . . . . . 4 4^ 



The Inferior-Oolite Beds at Leckhampton Hill and 

 Charlton Common are so well-known that it is unnecessary 

 to say much about them here. The following notes, however, 

 may be of some service. 



The Scissum-'Beds are not clearly exposed in the district under 

 consideration. 



The Pea-Grit is seen in the main quarry at Leckhampton Hill; 

 in a slipped mass alongside the path at (29) ; at (30); in the quarry 

 in the isolated mass at (31), where its top-portion is visible below 

 the basement beds of the Lower Freestone, and in a quarry near (26). 



I A detailed section of Leckhampton Hill and references to previous literature is given in an 

 account of an excursion made by the Club to the hill in 1905 : Proc. Cotteswold Nat. F.C., vol. xv. 

 pt. 3 (1906), pp. 182-189. 



