426 On the ROCKS in the 
No. 50. is another {pecimen of the fame kind ; the greenftone 
is here of the ufual colour, and the line of junction moft admi- 
rably defined. This.was taken from the great quarry. The 
next, (No. s1.), is a fpecimen of the fandftone in its fuppofed 
unaltered ftate. Nos. 49, and 50. are beth from the lower 
junction. No. 52. is from the upper edge, taken about half- 
way between the higheft part of the Craig and Holyroodhoufe. 
Here the fandftone prefents a facetted appearance, an arrange- ~ 
ment which may be owing to the fuperabundance of calcareous 
matter. 
No. 53. is highly indurated, of a deep red colour, with a 
conchoidal fraéture, and a facetted texture. 
No. 54. has the fame facetted appearance. 
No. 55., extremely clofe-grained, is from one of the contor- 
tions north of the dike. 
Nos. 56, & 57. Thefe are the varieties of the fandftone which 
have been called jasper. This is an improper name, as it con- 
founds two fubftances totally different. The moft compaé con- 
tains a large proportion of lime, and in afpect is very fimilar to 
fome of the limeftones of Gibraltar. 
Nos. 58, to 61. are varieties of the fandftone, found near the 
greenftone. j 
No. 62. Although this fpecimen was taken very near the 
ereenftone, ftill it does not exhibit the ufual induration, This 
exception occurs in different places on Salifbury Craig; and it 
even fometimes happens, that the ftone next the whin is lefs in- 
durated than the one below it. - 
No. 63. Containing a large proportion of ferruginous mat- 
ter. 
No. 64, to 66. Different fhades.and varieties of the fandftone, 
in an indurated flate. 
No. 
i ee 
