VOL. XVII. (i) INFERIOR OOLITE— SOUTH COTTESWOLDS 



133 



Top-Beds 



Intervening-Beds 



Freestone-Beds 

 proper 



Pea- Grit series 



s in feet 

 i I4i 



RoDBOROUGii Hill 



At Rodborough Hill the general sequence of beds is as 

 follows : 



Thickne: 



I. Rubbly Beds 



II. White Oolite 



III. C/>'/'e!<s-Grit 



IV. Upper Coral-Bed : max. .. 2 J 

 Non-sequence. Bed V. wanting 



VI. Upper Trigonia-Grlt . . . • 6 



Non-sequence. Beds VII. to 

 XII. (incl.) wanting 



f XIII. Buckmani-Grit ] About 



\ XIV. LovfCT Trigonia-Grit .. ..J 3 



Non-sequence. Beds XV. to 

 XIX. (incl.) wanting 

 (■ XX. Upper Freestone . . . . 14 



XXI. Oolite Marl 7 



[ XXII. Lower Freestone . . . . 79 



r XXIIL Pea-Grit 13 



- XXIV. Lower Limestone . . \ 



[ XXV. Scissum-Beds .. .. i '^'* 



XXVI. Opaliniforme Bed .. .. ?i 



Cephalopod-Bed 

 Cotteswold Sands 

 Upper-Lias clay 

 Marlstone 



Of the Inferior-Oolite subdivisions, the lowest now seen is 

 the Lower Limestone. The top-portion of this rock, with the 

 Pea-Grit, and basal portion of the Lower Freestone, is exposed 

 in a long disused quarry*^'* close to the Old Pound,' and it will 

 be noticed that the Pea-Grit has greatly increased in thickness. 



In the next quarry, '^' also now disused, the Bradfordensis- 

 Beds are seen. The upper portion (said by Witchell to be 

 14 feet thick, and by Hudleston 20 feet) is comparable with the 

 NerincBa-B&dt. of Nailsworth ; while the true equivalent of the 

 Oolite Marl occurs below, and is 7 feet thick {teste Witchell). 

 As Witchell wrote, the N erincea-^eds "contain Nerincsa 

 cotteswoldicB in great abundance. Several other species of 

 NerincBa occur ; indeed it is almost impossible to fracture the 

 rock without exposing the transverse sections of these shells ; 

 the outskirts of a coral-reef appear to have been their habitat."^ 



The top-portion of the Upper Freestone and the overlying 

 Lower Trigonia-, Buckmani-, Upper Trigonia-, and Clyfeus- 

 Grits, but no Upper Coral-Bed, are excellently and best seen in 



I " Geology of Stroud," p. 43. 2 Ibid., p. 49. 

 • These numbers refer to those on the map, fig. 5. 



