Page:Transactions of the Geological Society, 1st series, vol. 1.djvu/439



Explanation of the Section, in illustration of Mr. Aikin's Observations on the Wrekin, and on the Great Coal-Field of Shropshire.

Fig 1 is a section through the Wrekin, exhibiting the order in 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 which they rise.

A A A. 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 Welhach.

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.