[198]

[Printed proof diagram, see also CUL-DAR39.200. South America, p. 143: "No. 22. ─ Fragment of gneiss embedded in another variety of same rock."]

[199]

(18)

[Printed proof diagram] take out dots

[South America, p. 231: "No. 24. ─ In the valley of the Despoblado, the stratification, as before remarked, has been much disturbed, and in some points to a greater degree than I have anywhere else seen. I will give two cases: a very thick mass of thinly stratified red sandstone, including beds of conglomerate, has been crushed together (as represented in the woodcut) into a yoke or urn-formed trough, so that the strata on both sides have been folded inwards: on the right hand the properly underlying porphyritic claystone conglomerate is seen overlying the sandstone, but it soon becomes vertical, and then is inclined towards the trough, so that the beds radiate like the spokes of a wheel: on the left hand, the inverted porphyritic conglomerate also assumes a dip towards the trough, not gradually as on the right hand, but by means of a vertical fault and synclinal break; and a little still further on towards the left, there is a second great oblique fault, (both shown by the arrow-lines), with the strata dipping to a directly opposite point: these mountains are intersected by infinitely numerous dikes, some of which can be seen to rise from hummocks of greenstone, and can be traced for thousands of feet."]