. The Edinburgh new philosophical journal. Science. 278 Walk from Aberdeen granite, some of these several hundred feet tliick. From these beds of granite, veins of the same rock shoot out on both sides into the bounding slaty strata. In other parts, distinct veins of granite were observed waving through the hornblende-si ate. We also examined particularly the effects of the granite-rock on the substance of the slaty strata, and their different positions, as connected with the intrusion of the granite. It is worthy of re- mark, that, in some veins, one part of the rock was quartz-rock, like tha
. The Edinburgh new philosophical journal. Science. 278 Walk from Aberdeen granite, some of these several hundred feet tliick. From these beds of granite, veins of the same rock shoot out on both sides into the bounding slaty strata. In other parts, distinct veins of granite were observed waving through the hornblende-si ate. We also examined particularly the effects of the granite-rock on the substance of the slaty strata, and their different positions, as connected with the intrusion of the granite. It is worthy of re- mark, that, in some veins, one part of the rock was quartz-rock, like that of the Lion's-Head, while other parts were composed of red or grey granite. The micaceous hornblende-slate is used as a roofing material, clay or roofing slate not occurring in this district *. Having reached the mouth of the glen, we continued our examination along the course of the Clunie water, and the hills that bound it, to the Castleton. The stratified rocks in this direction we found to be mica-slate, quartz-rock, gneiss, and hornblende rock and slate. Among these, in the form of veins, or in apparent beds, that is, in branches of veins, and varying in size from a few feet to many yards in breadth, and many fa- thoms in extent, we noticed granite, felspar-porphyry, granite- porphyry, and hornstone-porphyry. The slaty rocks exhibit many interesting varieties of structure, which our limits will not allow us to describe. In some places the gneiss was disposed as represented by this • Shell-marl is met with in the glen in small quantity on the side of Loch Callader, consequently at a very considerable height above the sea, although not so high as the shell-marl on the mountain of Ben-i-gloe in Glen Tilt. Sir T. D. Lauder mentions shell-marl, in which, as is often the case, lacus- trine and land helices, &c. are intermixed, at a great height, in the farm of Inchrory, in Glen A Please note that these images are extracted from scanned page images that may
Size: 2507px × 997px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcontributorgersteinun, bookleafnumber302, booksubjectscience
