﻿440 NEW OOLITIC STRATA IN OXFOEDSHTEE. [Allg. I905, 



21. 0^ New Oolitic Strata m Oxfoedshtee. By Edwin A. 

 Walfoed, E.G.S. (Read June 21st, 1905.) 



[Abstract.] 



The divisions of the Inferior Oolite of North-West Oxfordshire 

 are described, and a quarry on the border of the county cited where 

 the Cotteswold facies dies out in the ' Parlcinsoni '-stage. A higher 

 division of the same stage (the Trigonia-signata Beds) of North- 

 amptonshire type is shown to sweep over the North-Eastern 

 Cotteswold region. The siliceo-calcareous beds (Chipping-Norton 

 Limestone) cover the countryside which gives them their name, and 

 are about 30 feet thick. Eossiliferous strata, separated from the 

 Chipping-Norton Limestone by a bed with vertical markings and a 

 black clay-band, indicative of much ' inter-waste ' of these and other 

 beds, are described. They are shown to be similar to the Lincoln- 

 shire (Ponton) strata described by Morris, Judd, and Woodward. 

 A new term is proposed for these beds, which are characterized by 

 the presence of the shell Necera, from the Perna-M.a,rh above the 

 black clays to a higher series of black-and-green clays underlying 

 the Stonesfield Slate. These beds and the Chipping-Norton Lime- 

 stones are classed with the sub-Bathonian. 



The beds equivalent to those of Oxfordshire have, in Lincoln- 

 shire and Northamptonshire, been known in part as Upper 

 Estuarine. In the 20 feet of Oxfordshire strata the 150 feet of 

 the Lincolnshire Limestone and the Upper Estuarine of the north- 

 eastern counties appear to be represented. The Author expresses 

 the hope that his work may help towards the discrimination of 

 the two kinds of deposit known as Lincolnshire Limestones, 

 inasmuch as the fossils characterizing each local (Oxfordshire) 

 stratum have been collected from the beds in situ. Lists of fossils 



