312 EEPOKT— 1881. 



The Oolites constitute the third belt and tlie Cretaceous rocks the 

 fourth. The overlap at the base of the latter is so great that between 

 Market Weigh ton and the Derwent, south, of Malton, the Cretaceous rests 

 directly on the Lias, and the Oolites form no part of the surface of the 

 ground between those points. 



In the west, the Hiimher hasin is bounded by the great Pennine 

 watershed, traversing England from noi'th to south ; to the south it is 

 limited by the remarkable watershed which, traversing England diago- 

 nally, practically separates all the rocks below the Lias from those above 

 it. To the north, it is terminated by the east and west watershed, 

 crossing England from St. Bees' Head to Robin Hood Bay, north of 

 Scarboi'ough. 



The Pebble Beds of the New Red Sandstone have been bored into at 

 various points, between Nottingham, Retford, and Selby, and are directly 

 overlain by the Keuper Waterstones, the Upper Mottled Sandstone and 

 Keuper conglomerate being alike absent. 



North of Selby the Pebble Beds also have thinned out, and the Keuper 

 "Waterstones and the Lower Mottled Sandstone are alone available for 

 underground water-supply in the plains of York. 



The Selby waterworks yield a water of 8 deg. of hardness, 250,000 

 gallons per day rising from a 6-inch hole 330 feet deep, to a height of 

 4 feet from the surface, or 16 feet above mean-tide level. The upper 

 portion of the boring consists of Warp-clay and silt, the lower 262^ feet 

 of Red Sandstone. 



Borings at York, 104 feet deep, and at Market Weighton, 300 feet, 

 did not penetrate the Keuper marls. 



A well at Walmgate Bar, York, passed through 



ft. in. 



!} 



Fine Sandstone . . . 204 0"! t tvt *4.i i 



Partmg with water . . .0 2 1^7 ^^^/°"^^^^ 

 Fine Sandstone . . . . 279 oj sandstone. 



667 2 



Jliijuher Southern Group. 



Magnesian Permian Triassic Keuper 



Limestone Sandstone Sandstone Marls Oolites 



Kiver Trent . 174 . . 108 . . 829 . . 1562 . . 12 



Eiver Ancholme — . . — . . — . , — . . 171 



In this group the Magnesian Limestone would probably yield a daily 

 average supply of 69 million gallons of water. 



The population in the group is ^\ millions, requiring 67 million 

 gallons of water per day. 



Fen Streams. 



Keujier Marls Oolites 

 Eiver Witham ... 6 797 



„ Welland ... 580 \ 



„ Nen ... 927/ 



„ Ouse ... 1316 



6 3620 



Population of this gi-oup in 1881 was about 1\ millions. 



East-Anglian streams do not drain any Triassic or Permian strata 

 on the surface. 



Clay and Stone . . . . 24 01 

 Quicksand . . . . 60 



Drifts. 



Drift covered. 



