The geology of Ascutney Mountain, Vermont . jprobably this rock that was referred toby Hawes as the granitell 74 GEOLOGY OF ASCUTNEY MOUNTAIJSr, VERMONT. [bull. 209. of Little Ascutney.** It sends apophysal tongues into the dioriteand is similarly believed to be younger than the porphyry, althoughonly on account of the chilling phenomena observed in hand speci-men and slide from the smaller dike where it is in contact with theother. Hints as to the relationship of this dike are to be found in the ledgeand hand specimen. When quite fresh the rock is a fine pale graywith a blue tone; in a few da
The geology of Ascutney Mountain, Vermont . jprobably this rock that was referred toby Hawes as the granitell 74 GEOLOGY OF ASCUTNEY MOUNTAIJSr, VERMONT. [bull. 209. of Little Ascutney.** It sends apophysal tongues into the dioriteand is similarly believed to be younger than the porphyry, althoughonly on account of the chilling phenomena observed in hand speci-men and slide from the smaller dike where it is in contact with theother. Hints as to the relationship of this dike are to be found in the ledgeand hand specimen. When quite fresh the rock is a fine pale graywith a blue tone; in a few days it changes color to the same hand-some olive-gray green which has been described as characteristic ofthe Windsor quarry rock. The resemblance between the two rocks isalso manifest in the way in which they fracture, and in the peculiarlyvibrant musical note given out when a large fragment is struck withthe hammer. Certain of the finer-grained streaks in the quarry canhardly be distinguished from the green dike in the hand specimen. ?^?3^. CamptonitediKes Paisanite Nordmarkite-porphyry Diorite Breccia Fig. 1.—Sketcli plan of intrusive rocks on Little Ascutney Mountain. The rock is a very fine-grained typical aplite with a sugary, panal-lotriomorphic structure (spec. 60). The essential minerals are nearlythe same as in the paisanite just described from the main is, however, quite prominent among the phenocrystic indi-viduals which are otherwise composed of microperthite, either inseparate crystals or in groups. The same constituents, with crypto-perthite and an alkali-iron hornblende identical in characters withthat of the Windsor quarry rock, are the essentials in the quartz and feldspar phenocrysts are connected through allstages of transition with the same minerals of the groundmass, and itis probable that there has been but one generation of these hornblende is strikingly poikilitic, as if corroded in the , olig
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