mar
'■ ■ OpI^^Oi'R N, W ^ . L L | ,93;
viz; ^a-very fmalli {proportion- o£jJ|oriy cement added to a fine iandf
and1 earth. This ftoneys confeq!|ently .pf a. fmall grit, is very eafy
' andjiWi^alces very ;pm!^alls ’arid cl^,Joints, but feldom.
fife£t|ai;ger' than .fiom a foot high, „to t^o feftiong, arid is apt to '
feale”; off’ at the^o^fers.i„ Of tha^'^ii^d, -jbut:r ofva morer.mmpadt,
uniform, and' fftfg grit, „we find» in fomeplaces very goodhyhet-
ftones-> for edging? knives>;;and .other tools;,: 5the rock, hailed Kam-
Jenn^pnedr Penzance pier, prod^e^ ^ eoyrfe *,of thefe < almoftj as
fair arid good jas the hones of the ftiop, and afe^fed as ftch in that
neighbourhoqd. > A fpecimen) ofy this kind weighs to*.,Water as
^ t o L y f i ’. .v< \ k W \ ,K 1 S J I B
^ Some of the cinereous killas confift of thin lamince laid in ftreightj-
lines one over another*;inr like manner asrilat, ,tq which ftapproacha^
very .near, but never rifts jyide and thinJ^OTgh'tq„anft^thdufttf. *
of it.’ Its mafles however are larger thftn theft* of the Helfton
quarry, but more fpungy, fuJbjeQ: to „hofft places, and ipoft: apt to
decay ,and g i v e w a y t h e weather. Of this ftone is,built the
fioufe tat Nanfwhydn,, Plate VIII.
In many places thje quarry-ftone of .the brown ferruginous killas
rifes large and hard, and with this they build in thetWeftefri parts
o f Cornwall, and in the Eaft at Camelford, Lancefton, and elfe- »
where; 'but it is fubjedt to the lame inconveftencyvqf damps as the
yellow before-mentioned. In ibme places it rifes in fuch large
i-flakes,' f t eafy for working, and they may be laid ofytheir edge "io
clofe, that they prove excellent materials for building piep and
moles into the fea; the beft I have yetfteard ofy.is that which rifts
jpn the parftnage grounds of.Mawnan, from which a great deal is
carried off yearly fpr building and repairing the Kayes at Falmouth,
St. Maws, and other trading towns in that harbour.
On the South coaft, betwixt Lilkerd and the Tamar, there are .s&c.T.y.
fome quarries; of fiat; which is? brought „dojyn and .fhipped off at .SIat-
Tidiford and Morlham, and, by means of the Tamar, lupplies the
i neighbourhood of Plymouth with covering „Jbi* their houfes, and is
fthence exported in pretty large quantities:, there are alfe^fomfe quarries
of fiat at Padftqw on, the l|o,rth coaft, whence, for m^y mifes
to the Eaft, the whole country,is fubjedfto a fhelfy fiat. There is
a better quarry ftill at Tindagel.;. but the beft covering,fiat which
we have in Cornwall, and indeed ft' all England, ' ft^p^jpis ^ .
« fineft: f t the world,” is at Denyball, about two spiles South ofoennybaiu
Tindagel, which will therefo^ require our more particular ’notice, i“3"7'
The whole quarry ft about tgriq- yards Ipqgi : to©
1 Dr. Woodward, Cat. vol. II. page 5.
B b deepeft