File:Derbyshire toadstone Whitehurst.jpg

Description
The plate shows a section near Matlock High Tor, north of Derby. Related to the toadstone of Derbyshire.

Source

 * Retrieved from http://www.lindahall.org/events_exhib/exhibit/exhibits/vulcan/42_large.shtml
 * Original source:
 * Whitehurst, John (1713-1788). An inquiry into the original state and formation of the earth. London: Printed for the author by J. Cooper, 1778