92 Reports and Proceedings — Geological Society of London. 



overlain by Actceonella- and iV^en'wf^a-limestones and an estuarine 

 series, and above these is a second hippurite-limestone characterized 

 essentially by Jlippurites organisans. It is pointed out that Toucas 

 similarly distinguishes two Hippnrite zones in Southern France ; the 

 lower, characterized essentially by H. cornu-vaccinmn, being placed 

 by him at the top of the Turonian System, whilst the second, with 

 JT. organisans, is referred to the summit of the Senonian ; and the 

 author gives reasons for regarding the Gosau zones as the equivalents 

 of those of the South of France, in which case the Gosau Beds 

 will represent the uppermost Turonian and the whole of the Seno- 

 nian, i.e. the zones of Holaster planus, Micraster, Marsupites, and 

 Belemnitella mucronata in England, whilst the upper unfossiliferous 

 beds may be the equivalents of the Danian Beds. 



The strata are, on the whole, of shallow- water origin, and were 

 deposited in shallow bays in the Upper Cretaceous sea of Southern 

 and Central Europe, on the northern Hanks of the Eastern Alps. 

 Probably towards the close of Upper Cretaceous times the southern 

 area of the Gosau District was cut off from the sea to form a lake- 

 basin in which the upper unfossiliferous series was deposited. 



2. "Artesian Borings at New Lodge, near Windsor Forest, Berks." 

 By Prof. Edward Hull, M.A., LL.D., F.R.S., F.G.S. ■ 



The boring described in this paper was carried down from a level 

 of about 220 feet above Ordnance-datum, through the following 

 beds : — 



Feet. 



London Clay \ ^, . 



Lower London Tertiaries j "^ 



Chalk 725 



Upper Greensand 31 



Gaxilt 264 



Lower Greensand 7 



The Chalk was hard, and contained very little water ; but on 

 reaching the Lower Greensand the water rose in the borehole to a 

 height of 7 feet from the surface. 



The author discusses the probability of the Lower Greensand 

 yielding a plentiful water-supply in the Windsor district. 



3. " Boring on the Booysen Estate, Witwatersrand." By D. 

 Telford Edwards, Esq. (Communicated by the President.) 



An account is given of a boring on the Booysen estate, situated 

 about 2 miles from Johannesburg, and about 5000 feet south of the 

 nearest point of outcrop of the " Main Reef" of the Witwatersrand. 

 The "Bird-Reefs" crop out generally at a distance of 4000 feet 

 south of the main Reef. 



The borehole, 1020 feet deep, passed through sandstones (often 

 micaceous), quartzites, and conglonaerates, the last-named having a 

 collective thickness of 91 feet 7 inches, the two thickest reefs being 

 respectively 26 and 22 feet thick. The dip of the beds was 35°. 

 Traces of gold were obtained. All the reefs were highly mineralized, 

 principally with iron-pyrites, and belonged to the "Bird-Reef" 

 series which overlies the Main Reef. 



