1859.] WRIGHT INFERIOR OOLITE. 39 



for the first time ; some only of which lived through subsequent 

 stages and flourished in the Cornbrash, in which they all died out. 

 It is a remarkable fact that the fauna of the Parkinsoni-zonc has 

 many more characters in common with that of the Cornbrash than 

 with the lower zones of the Inferior Oolite. 



I now proceed to describe sections in w r hich the typical litho- 

 logical and palseontological characters of the Parkinsoni-zone in the 

 Northern Cotteswolds are well exposed. I intend giving full lists 

 of all the species which I have collected from the different beds of 

 this zone, for the purpose of showing that even in this small forma- 

 tion all the species have not the same duration of life in time. 



A. Section I. — Leckhampton Hill. — Northern escarpment. 



The Parkinsoni-zonc may be said to attain its greatest thickness 

 in this section ; but the fossils are not so well preserved as in several 

 other localities. I commence with it, as it presents nearly all the 

 beds which I have enumerated in my general section of the zone. 



ft. in. 



A. Upper Trigonia-grit. — A coarse, brown, ferruginous, 



fragmentary oolitic limestone, much shattered. The 

 fragments contain impressions of Triyonia COStata, 

 T. formosa, and other Conchifers, with lib ynchoneUa 

 vpinosa, 111/, angulata, and other Brachiopods. In 

 the uppermost layer of the bed, Ammonites ParJein- 

 8oni lies 7 



B. Oryphite-grU. — A coarse, brown, ealcarco-siliccous 



ragstonc, wliich was an oyster-bank in the Oolitic 

 sea. It is composed of the valves of Gn/phcea sub- 

 lobata, Desh., which lie closely piled upon each 

 other, and constitnte almost the entire bed ..8 to 10 



CI. fellow sandy marl or day. which separates the 

 (irvphite-gritfrom the underlying Lower Trigonia- 

 grit. It contains mans shells: Pkoladomyafidi- 

 cvZa, Sow.; Qervillia Etarrtmamrti, Goldf. ; Modiola 

 gibbosa, Bow. : Modiola plicata, Bow. ; Pinna 

 cuneata, PhD. ; Terebratula perovaHs, Sow 1 



C 2, Lower Trigofnia-grit, A light-coloured rubbly 

 oolite, containing many fossils, chieflj moulds oj 

 Gfcuteropoda and Oonehifera - t<> I 



I). Tin OherrmfUzia-grit. — A hard ragstone ahove, and 



Soft mail below : — 



1 . Hard crystalline ragstone, i Lose-grained and non- 



fossiliferons. 



2. Light-coloured marls with OhenmUzia proeera, 



Doslong. 

 :<. Stilt' brownish olaj 



