. La geologia della Nova Scotia, del New Brunswick e del Prince Edward Island o, Acadian geologia [microformati]. Geologia; Geologia stratigrafica; Paleontologia, Geologia, economico; Géologie; Géologie stratigraphique; Paléontologie; Géologie économique. 106 TRIAS OK NUOVA KED arenaria. Il vertice di tlio rock. Rimescolando a bassa marea intorno al lato sud, wo trovare che questa, come il basalto di Blomidon, è uno spessore di letto irregolare e che amigdaloide tufo e riuscire in ordine discendente. Sul lato occidentale di questi ultimi scogli occupano quasi tutta la scogliera e possono, se esaminato da una distanza, essere

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. The geology of Nova Scotia, New Brunswick, and Prince Edward Island, or, Acadian geology [microform]. Geology; Geology, Stratigraphic; Paleontology; Geology, Economic; Géologie; Géologie stratigraphique; Paléontologie; Géologie économique. 106 THE TRIAS OK NEW KED SANDSTONE. summit of tlio rock. By scrambling at low tide around the south side, wo find that this, like the basalt of Blomidon, is a thick irregular bed, and that amygdaloid and tufa succeed it in descending order. On the western side these last rocks occupy nearly the whole of the cliff, and may, when examined from a distance, be seen to consist of several beds distinguishable by different shades of colour. In some lights this difference is very perceptible. On this side the basaltic trap still appears, but it forms only a thin bed, capping the amygdaloid and tufa. Under all these beds, and in the north-west corner of the island, the sandstone peeps forth, dipping to the south-cast. The trap of Partridge Island contains a variety of interesting crys- tallized minerals. A honey-yellow variety of .stilbite, crystallized in fine sheaf-like aggregations of crystals, is especially abundant, forming veins running up the face of the cliff. IJeing one of the most acces- sible and easily explored portions of the formation, this place has been much ransacked by mineralogists and amateurs ; still large quantities of fine specimens may generally bo seen going to waste on its beach. Amethyst, agate, chabazite, heuhindite, apophyllite, and calc spar, may also be studied in some of their most beautiful forms at Partridge Island. The whole of these minerals have been introduced by the action of water, trickling through the numerous fissures of the porous amygdaloid and tufa, rocks which perhaps, more than any others, are fitted to yield to water thus permeating them the materials of crys- tallized silicious compounds. Westward of Partridge Island, vertical and contorted Carboniferous rocks occupy the shore as far

Parole chiave associate all'immagine

• bookcentury1800
• booksubjectgeology
• booksubjectpaleontology
• bubo