The colour of the rock is blue, and it is frequently traversed by veins of calcareous spar.
In the schist which immediately reposes on the limestone, mica appears in considerable abundance, and the whole is strongly impregnated with lime. It is of a soft crumbling nature, decomposing on exposure to the atmosphere, and in that state it is much esteemed as a manure.
The floor on which the lime rests (probably the whole alternating formation) is an argillaceous schist, with veins of manganese, which have been partially wrought.
Mr. Greenough has laid down on his map a broad line extending about E. N. E. from Gerrans and Veryan, crossing St. Blasey Bay and ending near Looe, with the inscription, “calcareous matter along this line”.
WARBSTOW.
HALS.
Warbstow vicarage is in the hundred of Lesnewith, and hath upon the north Jacobstow, east Tremayne, south Trenegles, west Davidstow.
In the Domesday Book this district was taxed under the name and jurisdiction of Treveliad, now Trevelian.
This church was not endowed at the time of the first inquisition of the Bishops of Lincoln and Winchester,