94 



INFERIOR OOLITE. 



Leckhauiptoii Ilill, near Cheltenham, exhibits one of the most typical sections in 

 Gloucestershire of the three sub-divisions of the Inferior Oolite, where the following beds 

 are admirably ex])osed : — No. 1, 2 and 3 represent the zone of Ammonites ParJcmsoni : 

 No. 4 the zone of Ammonites Humplirieslanus ; No. 5, 6, and a, b, c, the zone of 

 Ami/wnites MurcltisoncB ; these rest conformably on d, the Cephalopoda, or Jurensis bed, 

 which is here very thin ; e, f, g, is the Upper Lias resting on h, the Marlstone. 



Section of Leclihampton Hill, near CheltenJiam. 

 Fig. 31. 



Leckhampton Hill. 



6 



A, B, C. 

 I). 



E, r, G. 



1. Trigonia bed. 



2. Gryphaea bed. 



3. Brown rubbly Oolite. 



4. Flaggy freestone. 



5. Fimbria bed or Oolite marl. 



6. Freestone. 



A, B, c. Pea-grit and ferruginous Oolite. 



D. Cephalopoda or Jurensis zone. 

 E, F, G. Upper Lias sand and Upper Lias clay. 



H. Marlstone. 



I. Middle Lias clay-zone of Ammonites capri- 

 cornus. 



No. 1 . The l^jjjer Trlrjonla Ited is a coarse brown ragstone, containing many fossils, 

 chiefly as moulds and impressions of Trigonia costata, Sow., T. decorata, Lye, Lima 

 cardiiformis, Sow., HhynclioneJla concinna Terebratula sjjinosa, Schl., Sow., Ammonites 

 Parkinsoni, Sow., EcUinohrissus clunicularis, Lhywdd, Holectypiis depressus, Leske, and 

 Clypeus Plotii, Klein ; in thickness it is about seven feet. 



No. 2. The Gryphaa bed, an ancient oyster bank, almost entirely composed of 

 Gryphcea stiblobata, Desh., with many other shells, as Pholadomya Heraulti, Ag., 

 Terebratula Meriani, 0pp., Tancredia donaciformis, Lye, Gervillia tortiiosa, Phil., and 

 many other species ; the dominant shell is the Gryphcea ; this bed is about eight feet in 

 thickness. 



No. 3. The Lower Triyonia bed, a light-coloured, thin-bedded oolitic ragstone, con- 

 taining a large assemblage of Conchifera, which in general have their shells preserved, 

 with several species of Lchinodermata and Corals. 



No. 4. Upper flaggy bastard-freestone, well seen above the Oolite-marl : twenty-six 



