Vol- 54.] KAILWAY BETWEEN LINCOLN A.ND 0HB8TEEFIELD. 163 



At the station called Arkwright's Town, on Duckmanton Moor, 

 the beds appear to be considerably disturbed, probably by the fault 

 (shown on the Geological Survey map) which crosses the line at this 

 point, but as the banks are now partially walled up the section is not 

 clear. Immediately west of this station commences the most com- 

 plete section to be seen along the whole line, which, including the 

 cuttings and tunnel, has a length of 1| mile. The beds, which 

 are seen here in one continuous section, represent the Middle 

 Coal and Iron Series, the most valuable part of the Derbyshire 

 Coalfield, and as they dip from 18° to 20° east of the tunnel, 

 and from 10° to 15° west of it, there must be a thickness of 

 between 1000 and 2000 feet of strata exposed at this place. The 

 following section illustrates the approximate thickness of the beds 

 between the station and the tunnel : — 



Section between Aekwright's Town Station and 

 Duckmanton Tunnel. 



Feet. Inches. 



1. Alternations of sandstone and shale (with coal-seam 1 ft. 4 in.) 100 



2. Shale with smutty coal , 15 



3. Flaffgy sandstone 15 



4. Shales with ironstone and coal 30 



5. Sandstone 4 



6. Shales with ironstone and coal 3D 



7. Sandstone 6 



8. Shales 25 



9. Coal 2 6 



10. Sandstone 30 



11. Park shales with some coal 35 



12. Shales and thin ironstone 25 



13. Sandstone 20 



14. Dark shales with ironstone 30 



15. Shales with thin sandy bands 40 



16. Sandy shales.. 20 



17. Dark shales 30 



18. Shales 8 



19. Sandstone 2 6 



20. Sandy shales 20 



21. Coal 1 



22. Shale 1 



23. Coaly shale and coal , 6 



24. Shale and ironstone 10 



25. Sandstone passing into shale above and below 1 



26. Laminated shales with thin coal 15 



27. Irony shale and sandstone 10 to 12 



28. Shales 12 



29. Sandstone 8 



30. Finely laminated shale with ironstone 12 



31. Shales and ironstone-nodules 30 to 40 



32. Sandstone with ironstone-nodules 10 to 15 



33. Darkshale 15 



According to the map, the outcrop of the Top Hard Coal is 

 crossed close to the station, but it is not seen, unless some smut 

 near the stationmaster's house represents it. 



The most conspicuous seams of coal are Nos. 9 and 23, which 



