40 
Notices of European Science. 
[Jan - . 
V/* IXI J'lJOltlUll y UUO 1 UUItV< * u > VI 7 » «U lMlilt • II# 
exhibits, in particular, the appearance which some observers hold to be particularly 
genuine. The sandstone is sometimes grey and arenaceous, or else compact, of the 
same color ; sometimes red, of various tints ; is in some situations simple, in some 
argillaceous, and in some calcareous. It is remarkable for containing beds of ar- 
gillaceous schists, sometimes so abundant as to occupy entire tracts of the surface, 
to the exclusion of the ai’enaceous strata. These beds sometimes resemble clay 
slate, more frequently greywacke ; very seldom the shales found in the white or su- 
perior sandstones, or those of the red sandstone of Arran. 
The junction of the sandstone with the subjacent granite is visible for some dis- 
tance : the former has a dip to the eastward of north, the inclination being about 40°. 
Ihe strata are perfectly even, and the line of junction of the two rocks corresponds 
with their seams. In a very few cases there is some slight irregularity in the sur- 
face ol the granite ; and in these, the sandstone strata are alfected in a corresponding 
manner. No fissures or other marks of disturbance are visible in the sandstone, nor 
is it penetrated by any granite veins. 
A\ ith legard to the modification in the mineral characters of these rocks produc- 
ed at the junction, the most striking is the apparent approximation of two rocks of 
such different characters. Where the mass of granite approaches the sandstone, 
the vertical or prismatic structure, visible in other places, first disappears, and there 
are then displayed solid masses, rounded by the action of the weather, and not .satisfacto- 
rily distinguishable by the eye from the neighbouring sandstones which have been 
subjected to the same influences. As it comes close to the sandstone, it resembles 
a stratified rock, and in one place there are even partings of an argillaceous cha- 
lac oi to mark the strata. These are in all their thickness, however, not more than 
one toot, and similar laminae may be observed, though of less extent, on the surface 
of the uncovered granite. The. granite has, in many cases, the most ordinary aspect but 
where it approaches the sandstone, it consists of quartz and felspar. In some places 
the e .nmerals are equally interred in large grains ; in others, large " rafns of 
. t are united in a sort ol general basis or paste of liner sand. Iii one variety 
tha7mS‘ b ^ le appearance, the large grains of felspar are of a high red colour, when 
■ w-ct • 
conS^^ 
and consisting chiefly of quartz sand with l few $* rtz ro f k > 
ates into a sandstone of thesr.nm W ottUspar. I his gradu- 
1 t 
o sandstones, red, purple, blue, and brown, intermixed with ,?, der ’ a senes 
pie grey wacke shales. In some places the schist* ^ . barue bIue and P ur “ 
stones. The order is not however always the AanS cdo f aini ’ m others ttie sand “ 
tion there are found conglomerates of various kind* , ^ man y P art s °f the juuc- 
sized structure, or consistiug of small fragments • oni’n f nCI ' i y t ° f moderate 
felspar, compacted to a state as hard as the -raniicVl, / i ? onsi8, f of quartz and 
ed as being similar in composition. A coarser 7 ! as bee . n alread y describ- ' 
ments of granite, or of quartz and fels P arcem e 3^^ smaI1 ( ™S' 
'* u ieties contain fragments of argillaceous schist ? ai 0 ilUceous schists. Other 
and some are ^ * * - ° ^^lnst or vh-i'idik fmiymonto nv,c*.. j i _ 
«V.Sr 
af* 
• -4J 
' 'yJ'.T* 
•7 
We have been 
teresting to some of our 
appearances (so rare in 
g.eat in England, is so much enhanced in India that .h-m f r 1 »u 
the power ot throwing light on questions of J Me \ l ot tb ° L Se who have 
journal from which the above notice is taken If '7. Probably never see the 
examples of the super-position of sandstorm U ( : m f sta ke not, there, are several 
from Dr Macculloch’s paper what in teresl att^f 'f ° J" IlU ! ia ’ and “ wiU be seen 
a detailed and faithful description of the nhenn KS subject ’ and how valuable 
ho P e our notice may he the means of 77,7 ™ 7 the sevend P la ces would he. 
° Ur readers who might be able to furnish such deStbm^ 011 ° f ^ ° f th ° Se of 
f$Ari 
