NATURAL HISTORY. 
in Dorsetshire, where they are incumbent on the 
chalk. Polypiferous remains and Echine, are of 
common occurrence amongst them, 
THE BOVEY CLAY & COAL FORMATIONS. 
These commence at the base of the granite hills 
in a large natural basin of irregular form, about 7 
or 8 miles in circumference, situated in the parishes 
of Hennock, Bovey Tracey, ['sington and Teign- 
grace, and nearly surrounded by hills of considera- 
ble elevation,* they continue on by a natural 
opening in a 8, E. direction to Teignbridge and 
Kingsteignton, and thence across the Teign by 
Newton, and by Ford at the base of Milburn Down, 
and might probably be partially traced in that di- 
rection on to the sea coast near Goodrington. 
The former consists principally of deposits of clay 
of cifferent degrees of purity, from that of a coarse 
and gritty quality to the purer marketable sorts, 
horizontally alternatmmg kind with other deposits 
consisting of sand and gravel—the whole apparently 
* The surface of this Basin is known by the name of the 
Bovey heathfield, aud is at an average height of 50 feet 
above the low water sea level, 
