VOL. XVII. (2) INFERIOR OOLITE— CHIPPING NORTON 



2lf 



DuNTHROP. — Mr H. B. Woodward has published some 

 notes on this section (22) and queried all the limestones below 

 the " shelly-bed " as being equivalent to the Oohte Marl'. 



Neseran ( 

 Beds I 



PQ 



Thickness in feet ins. 



•rf S « 

 o ti oi 



asm 



No. 22. DUNTHROP QUARRY^ 



Reddish, sandy and clayey soil and subsoil. 



2. Limestone, weathering into flaggy pieces 



'Limestone, also weathering flaggy. At the top it 

 often breaks up into a yellowish, oolitic.rub- 

 bly and seemingly " sandy marl " [= the 

 Clypeus-Grit of Mr Woodward'), and at 

 2 feet 2 inches below bed 2 is an irregular 

 shelly-bed (sometimes pebbly)" in which 

 TrigonicB abound, and occasional specimens 

 of Ostrea, Lima Pcardiiformis, Perna and 

 *^ Isastreea occur 



5 to I Limestones, more massive-bedded, iron-stained 



11 \ along the joints 



12 Limestone, hard, average . . 



13 \ Limestones, with irregular runnelled surfaces simi- 

 etc. ( lar to those in quarry number 33 : seen 



4 4 



The following sections are of less importance : 



West-Wood Quarry (23). — At the top are white " sandy " marls and 

 rubble, similar to the deposit seen in the quarry north of Chapel 

 House (20), then a marl-bed similar to that seen in the Dunthrop 

 Quarry (22), with brown oolitic limestones, which pass down into more- 

 than-usually-ferruginous limestones, below. 



Leys-Farm Quarry (24). — In this quarry, the highest bed seen is the 

 equivalent of bed 2 in the Dunthrop Quarry. At its base is the 

 equivalent to the rubbly marl of that section and of the sandy marl 

 of the West-Wood Quarry. Then comes a conspicuous bed of lime- 

 stone, under which is oolitic rubbly marl, about on the horizon of 

 the " shelly-bed " of Dunthrop, with below, the ordinary limestones. 

 Another quarry (25), nearer the farm, is in similar limestones. 



The Downs Quarry. — In this quarry about 15 feet of 

 Chipping-Norton Limestone is exposed. As a rule, the lime- 

 stone is well oolitic, and has a tendency to become sandy in 

 the upper portion and black speckled in places. In one part 

 of the quarry a considerable number of pieces of a greyish 

 limestone were found, which were literally crowded with gastro- 

 pods — mostly NerincBCB. The bed was not detected in situ ; 

 but there is little doubt that it is on the horizon of the Lower 

 ATmw^a-Bed and is comparable with the Gastropod-Bed seen 

 in a quarry near Lower Swell, near Stow-on-the-Wold.* 



1 " The Jurassic Rocks of Britain," vol. iv. (1894), p. 161. 



2 Mr Woodward queries this suggestion. 



3 When this layer is pebbly, it is not unlike that in Boulter' s-Barn Quarry, near Churchill (51) 



4 Proc. Cotteswold Nat. F.C., vol. xvi., pt. 1 (1907), p. 24. 



