26 baker's north YORKSHIRE. 



The second bed or upper slaty limestone is seen at Thorp- 

 arch, and is represented at Well and Nosterfield by a system of 

 smoke-grey and dark bluish-grey beds of Limestone shattered 

 so much as to resemble a highly indurated calcareous shale. 

 The following is the section of Seven-acre quarry near Well 

 from the main Magnesian Limestone bed upwards ; — 



feet. 

 7. Yellow magnesian limestone with carbonaceous stains... 3 



6. Dark shale passing into limestone ^ 



5. Yellow rubbly limestone with galena, worked in 1823, 



now deserted I J 



4. Dark brown and black shale, highly calcareous and 



semi-indurated i 



3. Earthy yellowish beds 3 or 4 



2. Thin shattered beds of brownish blue limestone with 



thin seams of marl 12 



I. Strong yellow magnesian limestone forming the base of 



the quarry 



Total 22 feet. 

 At Welsea quarry near Well this upper system of beds is 

 30 feet in thickness. The lime burnt from it may be spread over 

 the land at the rate of six chaldrons (216 bushels) to an acre, whilst 

 of the true Magnesian Limestone two chaldrons to an acre are 

 about as much as the soil can usually bear with advantage. In 

 Ripon park are beds of gypsum which probably belong to the 

 Red and White Marls which are placed above as the top stratum 

 of the series. 



Mesozoic Age. 



THE TRIASSIC SYSTEM. 



(11) The Banter Sandstone (often referred to as New Red 

 Sandstone) and (12) Keuper Series. — From the line drawn from 

 Piercebridge on the Tees, through Catterick Bridge on the Swale 

 to Tanfield on the Yore, and Thorparch on the Wharfe, which 

 forms the boundary on the east of all the Palaeozoic deposits of 

 North Yorkshire, beneath a tract of comparatively level country, 

 which measures in breadth twelve miles at the narrowest part, and 

 comprises altogether an area of 500 square miles, stretch the 

 deposits of the Triassic series. This is, in fact, the northern 



