xviii 



CONTENTS. 



CHAPTER XXXV. 



ON THE DUDLEY OR SOUTH STAFFORD AND WORCESTER COAL-FIELD. 



Introduction.— General arrangement of the Coal-field.— Account of the Formations in descending order.— ^ 

 Lower New Red Sandstone. — Volcanic Grit or Tufaceous Conglomerate. — Coal Measures, including 

 the Upper and 10 yard Coal, and the Lower or Ironstone Measures Shaft Sections. (PI. 37. figs. 



1 ^~ 5 ') 463 



CHAPTER XXXVI. 



SILURIAN ROCKS OF THE SOUTH STAFFORD AND WORCESTER COAL-FIELDS. 



Upper Silurian Rocks (Ludlow and Wenlock formations) support the Dudley and Wolverhampton Coal- 

 Fields and rise through them in separate masses. — Lickey Quartz Rock shown to be Caradoc Sand- 

 stone, or Lowest Silurian stratum of this district. — Intrusive Trap and altered rocks. Lines of ele- 

 vation and location. — Extension of Coal Measures beneath the New Red System. (See Map and 

 PI. 37. figs. 1—9.) 



CHAPTER XXXVII. 



SUPERFICIAL DETRITUS. 



Introduction.— Division of the subject of superficial detritus. — Drifts comprised within the hydrographical 

 region of Siluria. — Ancient or submarine condition of this region. — All its ancient drift shown to be 

 of local origin, and caused by local agency of tides and currents, influenced by elevations of the 

 bottom of the sea. — Such drifted matter found on slopes descending from elevated ranges, occupying 

 both lofty and low positions. — Enormous extent of ancient denudation in the transverse valleys now 

 watered by the tributaries of the Severn. — Distinctions between marine drift and fluviatile accumu- 

 lations . — Recapitulation 



CHAPTER XXXVIII. 



THE NORTHERN DRIFT. 



On a Northern Drift containing granite bowlders and sea shells of existing species, which covers large 

 parts of Lancashire, Cheshire, Shropshire, Staffordshire and Worcestershire ; prefaced by a sketch of 

 the probable condition of the surface before and during its deposit, comprising a short account of the 

 local detritus which the northern drift covers and with which it is partially intermixed 523 



CHAPTER XXXIX. 



NORTHERN DRIFT (continued). 



On the position of the great Bowlders which characterize the Northern Drift, and on the method of their 



transport , - 535 



