234 Kendall : The Concealed Coalfields of Yorkshire, etc. 



The Northern Boundary is formed by a persistent fold, in 

 some respects more easy of demonstration than that on the 

 south-east. 



The Coal Measures along- the whole length of the visible 

 edge of the field (about twenty miles) rise against an anticline 



iNEOCOMIAM 



ONCONFORMl 



KIMERIDGE CLAY] 



CCJNrORMlTY 



Comparative Series of Sections showing the Variations of Thickness of the 

 Jurassic and Neocoinian Rocks in Relation to the Market Weighton Axis. 



bringing up the Millstone Grit. This anticline can be followed 

 to the eastward for a few miles under the discordant cover of 

 Permian rocks, and then it and all other details of the structure 

 are lost sight of beneath the featureless mantle of Drift and 

 Alluvium which covers the \'ale of York. 



Naturalist, 



