LIMESTONE. 
48 
those rocks which are its modifications. The 
principal locality of the South Devon limestone is 
at the coast, where it appears in connexion with 
slate and sandstone in varying manners, but, it also 
occurs in several other spots, likewise much in union 
with other strata, as at Ashburton and Buckfastleigh 
which are considerably removed from the coast; 
and further, it appears in small and inconsiderable 
quantities at less distances from the main line, such 
as at Cann slate quarry, and at some other sites 
between that and the neighbourhood of Plymouth, 
closely connected to the slate rock. According to 
general belief, it passes from the south-western ex¬ 
tremity of Devon without much interruption east- 
wardly ; there divaricating ; but, after proceeding 
about nine miles eastwardly from the Dock Yard at 
Devonport, its western point, it is temporarily hid¬ 
den from view if not discontinued, and is traced 
subsequently, rather by glimpses and indications 
than by direct continuity. Its course, even for the 
above-named distance is occasionally lost, and it 
seems certainly throughout, to have a decided dis¬ 
position to occur in isolated forms, both in that 
immediate course, and at small distances therefrom, 
thus, while it is traced in the neighbourhoods of 
Plymstock, Brixton, and Yealmpton passing east¬ 
wardly, an indication betrays itself at Boveysand, 
and a small patch is detected bordering the river 
below Coffleet, a narrow seam of lime may also be 
seen in the slate of Bigbury Bay, which possibly 
may pass to a more considerable body of that rock 
in a subaqueous position,—all these isolations 
being invariably intimately joined to the body of 
adjacent schist. But, though it is thus so greatly 
connected to the slate rock, it is likewise very much 
blended with sandstone in some few situations, as 
at the Devil’s Point, and Mount Wise, and, while 
an intermediate kind of rock between the lime and 
