. The Quarterly journal of the Geological Society of London. synclines thatgive rise to the ridge-and-valley scenery referred to in the sectionon the ; Succession in the Braemar Area (p. 423). This type of folding, however, attains its full development onlyin the harder bands, which must, moreover, have a certain thicknessbefore its development is possible. A perfect illustration of theseprinciples is afforded by the little sill of hornblende-schist shown inthe section across Glen Tilt (fig. 0, p. 444), the thickness of whichhas to be greatly exaggerated to enable it to be shown. But in onepla
. The Quarterly journal of the Geological Society of London. synclines thatgive rise to the ridge-and-valley scenery referred to in the sectionon the ; Succession in the Braemar Area (p. 423). This type of folding, however, attains its full development onlyin the harder bands, which must, moreover, have a certain thicknessbefore its development is possible. A perfect illustration of theseprinciples is afforded by the little sill of hornblende-schist shown inthe section across Glen Tilt (fig. 0, p. 444), the thickness of whichhas to be greatly exaggerated to enable it to be shown. But in oneplace, owing to a sudden increase in its original thickness, it wasable to fold on itself, and form a homogeneous mass \\ mileslong, and 300 yards broad at the observed outcrop, having a TTl -I- CO TS *f m N -4-> u (-1 in trt fi P. ?—i i/i O (-j rt O 5 Q >> -u 1 0> I* - rt ?4-» 0 s G in .—< rt rl J3 G OJ W o • j3 u b/> 13 ? ^ pj o to § -a H o oo hoc w OJ a • hJ S HwO COCO opes u< o HU wc/). ^>^Vw^\\to^,T;.
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Keywords: ., bookcentury1800, bookdecade1840, booksubjectgeology, bookyear1845
