Trigonia ctpullus J. de C. Sow. 

 Unicardium impressum Morris & 



Lycett. 

 Unicardium cf. parvulwm Morris & 



Lycett. 

 Natica cf. zelima d'Orb. 



Yol. 69.] TWO DEEP BOEINGS AT CALVERT STATION. 317 



Rock of Thornford and Milborne Port. 1 The type described by 

 Sowerby came from the Oxford Clay of Peterborough, but the forra 

 shown in his figure does not appear to differ from the forms found 

 in the Great Oolite. 



The following is a list of the fossils obtained from the cores 

 between 136 and 195 feet :— 



Lignite. j Pecten (Camptonectes) annulatus (!) 



Sponge-spicules. J. de C. Sow. 



Bryozoon (?). I Cf. Pecten (Camptonectes) lens J. Sow. 



Rhynchonella sp. [of ' concinna' type], ', Pholadomyu cf. deltoidea (J. Sow.). 



Ehynchonella sp. [of ' obsoleta ' type]. Pholadomya heraidti Ag. 



Terebratula bathonica S. S. Buckman. Pholadomya sp. 



Terebratula globata auctr. Pleuromya sp. 



Terebratula, sp. ! Pseudotrape~ium (!) caudatum (Lye). 



Astarte ('!). j Pterqperna costal ula? (IJesl.). 



Cyprina (!). \ Tancredia (" 



G-rammatodon hirsonensis (d'Arch.) 



Gresslya peregrina (PhilL). 



Homomya gibbosa (J. Sow.). 



Modiola imbricata J. Sow. 



Modiola sp. 



Ostrea sowerbyi Morris & Lycett. 



Ostrea sp. nov. (?). 



(iv) Chipping-Norton Limestone. [J. P.] 



Underlying the thinly-bedded limestone at the base of the Great 

 Oolite at Calvert is a yellowish oolitic limestone, which passes 

 below into a sandy limestone with many oolitic grains. The lowest 

 bed is false-bedded, and rests on the shales of the algovianum zone. 

 By their characters the limestones were recognized as representing 

 the Chipping-Norton Limestone. Unfortunately, however, they 

 proved but sparingly fossiliferous, and so their correlation is 

 based entirely on lithology. Dr. Davies had sections made of 

 several specimens ; and, as a result of his examination of their 

 microscopic structure, he states that they are identical with 

 Bed 22 of Mr. E. A. Walford in Sharp's-Hill Quarry. 2 Since there 

 was no trace of the jSTeoeran Beds in the cores, there is thus a marked 

 non-sequence at the base of the Great Oolite. In the section at 

 Sharp's Hill the beds between the BhyncJionella- Ostrea band and 

 Bed 22 of Mr. Walford's succession reach the thickness of about 

 20 feet 7 inches (loc. cit.). At Calvert there is about 5 feet of 

 marls and limestones between the same horizons ; therefore, the 

 thickness of beds unrepresented between the Great Oolite and the 

 Chipping-Norton Limestone is nearly 16 feet. 



The following fossils were found in the sandy limestones ; the 

 brachiopods, however, were too fragmentary for identification. All 

 the specimens are in the collection of Dr. A. M. Davies. 



Ehynchonella sp. ! Ostrea sowerbyi Morris & Lycett. 



Terebratula sp. | Ostrea aff. acuminata J. Sow. 



1 "S. B. Woodward, ' Jurassic Eocks of Britain' Mem. Geol. Surv. vol. iv 

 (1894) p. 237. 



2 ' On some New Oolitic Strata in North Oxfordshire ' Buckingham, 1906, 

 p. 10. 



