110 Rev. A. Sedgwick on the Geological Relations and 



have been cut through near the village of Monkton, not far from the eastern 

 boundary of the yellow limestone. The upper limestone in the canal below 

 Brotherton is also immediately surmounted by red marl*. These facts may 

 seem opposed to the order above described ; but they admit of explanation. 

 The deposits of gypsum near Ripon may belong to the lower red marl and 

 o-ypsum, or they may be subordinate to the lower part of the upper red sand- 

 stone. The red marl of the Knottingley section can hardly be considered as 

 anomalous; for red marl (generally in the form of a thin band, and sometimes 

 swelling out to a considerable thickness) is regularly interposed between the 

 thin-bedded limestone and the upper red sandstone f. Any further details con- 

 nected with these deposits would be foreign to the objects of this paper. 



Such are the seven great natural divisions of the new red sandstone series. 

 A general summary of their relations to corresponding formations on the con- 

 tinent will be given among the concluding observations of the next Chapter. 



Chapter III. — Detailed Sections. — Faults and Dislocations. — Minerals and 

 Mineral Springs. — Organic Remains. — General Conclusion. 



The following sections exhibit in detail the relations of some of the lower 

 beds of the group described in the preceding Chapter. 



No. 1. — Micklebringj;, near Doncaster. The series is derived from the old 

 reddle pits, and from the coal works, and in the descending order§. 



Feet. Inches. 



1. Lower beds of the great yellow limestone : between the beds, blue and") — — 



yellowish blue argillaceous seams. These form the top of the escarp- V 

 ment J 



2. White and yellow marl 1 6 



3. Yellow, incoherent, rubbly limestone 4 



* See Plate IV. No. 1. and Plate VII. fig. 6. 



t In the greater part of Nottinghamshire the order is as follows : — 1st. Yellow limestone. — 

 2nd. A thin bed of red marl. — 3rd. Forest sand or upper red sandstone. 



Near Worksop the bed of red marl becomes of considerable thickness ; and a little further to 

 the north it is subdivided, and its place is occupied by three distinct deposits. The order then 

 becomes as follows : — 1. Yellow limestone. — 2. Lower red marl and gypsum. — 3. Upper lime- 

 stone. — 4. Thin band of red marl. — 5. Forest sand. This thin band of red marl, though gene- 

 rally too insignificant to be counted, may in some places swell out into importance, and give rise 

 to appearances like those at Knottingley. 



X See p. 57. and p. 68. 



§ Large quantities of reddle were formerly raised from these pits and exported to Holland. 

 The works are now almost deserted. 



