6 BAKER S NORTH YORKSHIRE. 



TABLE OF THE STRATA OF NORTH YORKSHIRE. 



The numbers and arrangement [as well as the colouring of the map] are adapted from 

 Ramsay's Geological Map of England and Wales, slightly modified by the Ordnance Sur- 

 vey Maps, upon which Ramsay's is based. The numbers in Ramsay's map run up from 

 I (Cambrian) to 26 (Alluvium). 8 is the Coal Measures and the Cretaceous are 18 to 21. 



NAMES. LOCALITIES. 



III. Quaternary part of Kainozoic Age. 



PLEISTOCENE SYSTEM. 



Glacial Epoch Superficial deposits filling the 



great central valley and its 

 main branches to a consider- 

 able depth, and to be met with 

 even on the highest ground. 

 II. Mesozoic or Secondary Age. 

 JURASSIC SYSTEM. 



1 6. Upper Oolite Helmsley, Pickering, Kirby- 



moorside. 



15. Middle Oolite Summits of the tabular range 



of hills between Thirsk and 

 Scarborough. 



14. Lower Oolite Summits of the Cleveland hills 



and flanks of those between 

 Thirsk and Scarborough. 



13. Lias Whitby, Redcar, Guisborough, 



Stokesley, Easingwold. 

 TRIASSIC SYSTEM. 



RhcBtic Passage Beds ...'Lzizeriby (S. W. of Redcar), 

 Stokesley. Barton Hill (York 

 and Malton Line). 



12. Keuper Marls I Yarm, Northallerton, Croft, 



II. Banter Sandstone... ) Thirsk, York. 

 I. Palaeozoic or Primary Age. 

 PERMIAN SYSTEM (DYAS). 

 10. Upper ( Magnesian 



Limestone., cs-'c.) ...Piercebridge, Tanfield, Ripon, 

 Thorparch, Tadcaster. 



9. Lotver Near Thorparch. 



CARBONIFEROUS SYSTEM. 



7. Millstone Grit Cotherstone, Masham, Colster- 



dale, Ueepdale, and summits 

 of most of the western hills. 



6. Yoredale Rocks ) Most of Western Moorlands ; 



5. Mountain Limestone f lower beds in Wensleydale, 



Swaledale, Gretadale, Upper 

 Teesdale. 

 SILURIAN SYSTEM Upper Teesdale. • 



