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.
