NATURAL HISTORY. 
as well asa considerable portion of Highweek, East 
Ogwell, and Denbury, may be considered as tran- 
sition—as well as another South-eastern range 
which has a part of Marldon and Berry Pomeroy, 
as its inland boundary, and occupies a large portion 
of Churston Ferrers and Kingswear. A more or 
less lamellar structure characterizes the whole of 
these formations, and the strata for the most part, 
dip towards some easterly point of the compass, 
with various degrees of inclination, (in some in- 
stances they appear almost vertical) they are often 
bent in a curved or zigzag manner, and are fre- 
quently traversed by veins of quartz. The other 
characters of this formation are very various. It 
passes by insensible gradations from a more compact 
and micaceous kind in the neighbourhood of the 
granite, to the roofing slates and others of various 
degrees of softness, down to a disintegrated clay. 
To this formation belong also other rock strata, that 
require attention, along various parts of the granite 
boundary, sometimes interposed between the granite 
and micaceous or argillaceous schist, and sometimes 
incumbent on one or other of the latter. These 
have chiefiy either a syenitic, porphyritic, or sili- 
ceous character, but to trace out the various limits 
and characters of each, would be a most difficult, 
and in some instances, an impracticable task— 
occasionally rock strata of very distinct character 
succeed each other abrupily—but in a number of 
instances, the passage from one rock to another con- 
tiguous one, takes place by very gradual change. 
