Reports and Proceedings — Geological Society of London, 383 



from near the Diamond Fields to Middelburg, has recently afforded 

 much additional information with regard to the Glacial Conglomerate 

 in this part of South Africa. The district lies on the northern 

 edge of the principal area occupied by the Karroo System, and 

 includes a number of outliers, the area between which affords 

 information as to the source of the material of the Conglomerate 

 and the character of the land-surface on which it was deposited. 

 This surface is smoothed, grooved, and scratched by ice-action. The 

 Karroo System is here only 400 or 500 feet thick, and the 

 Conglomerate usually about 50 feet; but, where deposited in hollows, 

 it may reach 200 feet or more in thickness. The fragments are usually 

 from 1 to 3 feet in diameter, but may attain as much as 8 or 10 feet ; 

 they are often facetted and sometimes show striations. The majority 

 of the boulders are of local origin. True bedding-planes are rare in 

 the Conglomerate, but there are included patches of sandstone, mud- 

 stone, or shale, some of which show ripple- or eddy-markings. The 

 sti'ise are remarkably constant in direction, and they and the 

 transport of boulders indicate an ice-movement from the north-north- 

 west to the south-south-east. In the Prieska district Rogers and 

 Schwarz found the movement to have been from north-north-east 

 to south-south-west, and the same direction is given by Schenck 

 from near the junction of the Orange and Vaal Eivers. During 

 1904 outliers of the Conglomerate were found farther north, near 

 the junction of the Elands and Olifants Rivers. 



3. "On New Oolitic Strata in Oxfordshire." By Edwin A. 

 Walford, F.G.S. 



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 ' ParMnsoni '-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. Fossiliferous 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 

 Lincolnshire (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 

 Marls above the black clays to a higher series of black and green 

 clays underlying the Stonesfield Slate. These beds and the 

 Chipping Norton Limestones are classed with the sub-Bathonian. 

 The beds equivalent to those of Oxfordshire have, in Lincolnshire 

 and Northamptonshire, been known in part as Upper Estuarine. 

 In the 20 feet of Oxfordshire strata there appears to be represented 

 the 150 feet of the Lincolnshire Limestone and the Upper Estuarine 

 of the north-eastern counties. 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 



