S62 Professor Jameson‘’s Geognostical Description 
nate above and below in the mass of the greenstone-rock in 
which they are inclosed. The sides and walls of the veins have 
the same characters as the surfaces of tabular distinct concre- 
tionsj and as these concretions are of cotemporaneous formation 
with the greenstone in which they are contained, the veins may 
be considered as having been formed in the same manner, and 
at the same time, with the roctk in which they are contained. 
The calcareous-spar veins vary in breadth from half an inch to 
five or six inches. They frequently contain, besides the spar, 
also celestine, calcedony and agate^ and these are either arranged 
in layers with the spar, or are irregularly intermixed with it. 
In several parts of the hill, these calcareous-spar veins contain 
disseminated angular or roundish portions of glance-coal 
In the Miller’s Know there are very beautiful and interesting 
displays of the various crossings, shiftings, and changes in the 
direction and magnitude of the veins. Indeed there is no cliff 
near Edinburgh which shews so distinctly the different phenome- 
na of veins as that just mentioned. The veins of limestone, 
agate, jasper and iron-pyrites, present no arrangements which do 
not also occur in the calcareous-spar veins. 
4. 
On the east and north-east slopes of the hill, there are nume- 
rous strata resting on the porphyry and other rocks already de- 
scribed. These strata dip to the E. or N. E. under angles va- 
rying from 15° to 25°. The strata are sandstone, slate-clay, bi- 
tuminous shale, wacke, and clay-ironstone. Of these the most 
abundant is the sandstone ; the wacke, shale, slate and iron- 
stone being less frequent. The sandstone, of which there are 
several quarries on the slope of the hill, is principally compos- 
ed of quartz ; but when in the state of conglomerate, the 
quartz is associated with portions of felspar, red jasper, flinty 
slate, Lydian stone, and agate. The other rocks, with the fine 
section of their various alternations, has been already described 
in pages 141, 142 and 143 of this volume. 
* Glance-coal, according to the Huttonian system, is said to have been depriv- 
ed of its bitumen by the action of heat, yet here it is associated with calcareous-spar, 
having the usual complement of carbonic acid. 
