Glapwell Colliery section of strata record book, for Shafts Nos. 1-3 Pages 1-20, for Shaft No. 1; pages 21-55, for Shaft No. 2 (1882-1918), and pages 57-82, for Shaft No. 3, started 24 Jan 1920, finished 2 Aug 1924. Columns for date (rarely used), description of strata, thickness of strata (in yards, feet and inches), depth from surface (in yards, feet and inches) and remarks. Page 84, notes on section of Blackshale Seam in cross measures drift down 1 in 4 from South Level in Main Seam, No. 3 Pit, taken 27 Apr 1939 by A.H. Booth. [mid 20th cent]