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EXPLANATION. 



and peri)end!cular lines. 



■The Map is divided into square miles by hotizontal 



GEOLOGY.— Thi.s Section will be officially represented l^y its President, 

 Mr. Thos. Tate, F.G.S., and its Hon. Sees., Rev. W. Lower Carter, M.A., 

 F.G.S., and Mr. J. W. Slather, F.G.S. 



Prof. T. jVIcKcnny Hughes, of the Woodwardian Museum, writes as follows: — 

 The geological structure of the district round Ferryluidge is simple though the details 

 are complicated Eind the questions suggested by an examination of the rocks of the 

 area are difficult and of wide bearing. The beds which form the base of the Lower 

 Mesozoic_ rocks, that is to say the Magnesian Limestone series, rest unconformably 

 upon various members of the Middle Coal Measures, which they traverse with an 

 outcrop trending in an NNW. direction. The escarpment due to these harder 

 .rocks, as compared with the soft overlying Trias is cut through by the Aire at 

 Ferrybridge. The Carboniferous rocks stretch away to the west in rolling rounded 

 outline, with here and there a crag where harder beds project, and on the east 

 irregular patches of Pleistocene sands and gravel, with the estuarine alluvium partly 

 natural and partly artificial, extend to the sea along a low flat country through 

 which the rivers run Ijetween l)anks often at a higher level than the surrounding 

 ground. One might have thought that the easiest point would be the determination 

 of the exact position of the break between the Magnesian Limestone series and the 

 Coal Measures, but this has proved a question of some difficulty, and a trip to Ponte- 

 fract will enable members to study the massive yedow sandstones which occur along 

 the road into the town, and which were long of doubtful age until by the discovery 



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