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The whole extent of the mountainous country passed in our two last stages, was of porphyry, with crystals of quartz and felspar in a grey paste; on both sides of it, the rock was granite and pegmatite; and, at the north-west side of the gorge, I observed talc-schist in the bed of the river.
Its great antiquity was inferred from its mineral texture, from the absence of fossils, and its passage downward into talc-schist and garnetiferous mica-schist; these rocks again graduating downward into gneiss, which is penetrated, at Forno, by granite veins.
The flats increased on both side of the river, and were openly timbered with box and narrow-leaved Ironbark. The rock near our yesterday's camp was talc-schist. Farther down sienite was observed, which contained so much hornblende as to change occasionally into hornblende rock, with scattered crystals of quartz. Granite and pegmatite were round some lagoons near the creek from the southward.
Tertiary deposits also appear in a less elevated position on the flanks of the Eastern Alps; but in the Central or Swiss Alps, the Palaeozoic and older Mesozoic formations disappear, and the Cretaceous, Oolitic, Liassic, and at some points even the Eocene strata, graduate insensibly into metamorphic rocks, consisting of granular limestone, talc-schist, talcose- gneiss, micaceous schist, and other varieties.
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