630 EDWARD HULL ON" THE CLASSIFICATION 



(6) South-Staffordsliire Coal-field. 



Thickness — feet. 

 Stage G. Tipper Coal-measures. — Eed and mottled clays, red and grey 



sandstones, and gravel beds 800 



Stage F. Coal-measures. — Shales, sandstones, clays, with coal-seams and 

 ironstones above the New-mine ironstone. Fish-remains, Anthra- 

 cosia ( Unio) 200 



Stage E. Lower (or Gannister) Beds. — Shales, sandstones, with coals and 

 ironstone (" New mine " and " Pennystone"), with marine fossils — 

 Productus scabriculus, Aviculopecten scalaris, Lingula mytiloidcs, 

 Conularia quadr [sulcata, &c 200 



As these beds rest directly on the Upper Silurian rocks, Stages A, 

 L, C, and D are not represented. 



The marine fossils from the " New- (or " "White- ") Mine " and 

 " Penny stone " ironstones are similar to those from the ironstone of 

 the same name in the Coalbrook-Dale Coal-field ; both are near the 

 bottom of the Coal-measures, and mark a definite marine horizon. 

 Along with the truly marine genera, bivalves of the genus AntJira- 

 cosia (?) are sometimes found ; but the late Mr. Salter states that 

 " it appeared that generally where undoubtedly marine shells were 

 present these so-called Uniones were absent"*. The commingling 

 of these shells is not confined to this district, but has been observed 

 in Lancashire, and probably indicates the alternation of marine and 

 estuarine conditions in certain localities. 



(7) Leicestershire Coal-field. 



All the stages are here represented, though in diminished dimen- 

 sions as compared with the coal-districts to the north. 



Thickness — feet. 

 Stage G. Upper Coal-Measures. — Coarse grits of Moira and Newall, with 



Stembcrgia, resting unconformably on Middle Coal-measures t 20 to 50 



Stage F. Middle Coal-measures. — Sandstones, shales, and clays, with 



several coal-seams. Plants; Anthracosia {Unio)\, Cythere or Cypris 1500 



Stage E. Lower Coal-measures. — Shales and sandstones &c, with a few 

 thin seams of coal below the " Heath-end " coal §. Shells of marine 

 genera have recently been discovered 1000 



Stage D. Millstone Grit. — Coarse grits, &c 50 



Stage C. Yoredale Beds. — Shales, &c 25 



Stage B. Carboniferous Limestone. 



* Jukes, ' South-Staffordshire Coal-field,' 2nd edit. p. 58. 

 t The late Eev. W. II. Coleman, ' The Geology of the Leicestershire Coal • 

 field ' (Mem. Geol. Survey), p. 56. 

 | Mammatt, ' Geological Facts,' &c. 

 § These beds are chiefly known from boring records. 



