420 SIMPSON : STRATA AND DEPOSITION OF THE MILLSTONE GRITS. 
- Survey Memoirs. 
Publications Consulted. 
Geology of the Yorkshire Coal-field 
„ ,, Neighbourhood of Halifax, 
Huddersfield and Dewsbury 
,, „ North Derbyshire ... 
Building of the British Isles ... ... Jukes-Browne. 
The Structure and Origin of Millstone Grit 
of South Yorkshire H. C. Sorby,F.R.S.,&c. 
Trans. R. M. Soc., March 1st, 1887 
Proc. Brit, Assoc., 1886, p. 9 .. ... Prof. Bohney. 
West Yorkshire ... ... Davis and Lees. 
Trans. Manchester Geol. Soc, Feb. 22nd, 1870 Jas. Spencer. 
Do. do. Mar. 26th, 1874 do. 
