Explanation of the Section ^ in illustration of Mr. Atkins Observations 

 on the IVrekin^ and on the Great Coal-Field of Shropshire. 



Fig 1 is a section through the Wrekin, exhibiting the order ia 

 which the mineral beds occur on the E. and W. of that hill. 



Fig. 2 represents the horizontal angle formed by such of the beds as 

 are distinctly stratified, together with the point of the compass 

 towards v/hich they rise. 



AAA. Old Red Sandstone. 



B. Independent Coal Formation. 



C. A Limestone Formation lying below the Coal. 



D. Sandy Slate Clay. 



E. Slaty micaceous Greenstone. 



F. Quartz-grit. 



G. Claystone. 



H. Feldspar and greenstone amygdaloid. 



I. Greenstone. 



K K. Two small Coal-formations at Dryton and Welbach. 



L. The Grauwacke of Lyth-hill, upon which rests a patch of 

 Greenstone I, the old Red Sandstone A, and the Coal-formation 

 of Welbach K, which latter fills a narrow trough formed by the 

 junction of the Grauwacke and Sandstone. 



