... Geology of Oahu

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Page 47 - I surmised that this rock came from Rocky hill, as there is a slope from the crater to the quarry and to the church. There are several masses of cinders interrupting the continuity of the basalt, which are suggestive of blow-holes and steam vents. Amygdaloidal and zeolitic minerals occur at the quarry. Phacolite and laumontite have been identified among them. Calcite and amorphous silica are also present, the latter on surfaces several square feet in extent in rudely parallel lines. The bluff is...
Page 58 - The conclusion to which I came was that the whole mass of Diamond head had been slowly deposited in comparatively shallow water and gradually elevated without being subjected to notable flexure. The ejection of material at first must have been intermittent, with long quiescent periods, to enable the shore to have been repopulated with mollusks and corals.
Page 47 - The bluff is traversed by small veins full of nephelite, granular melilite, and augite. Either of these minerals may form a layer of crystals, closely crowded together, all standing vertically to the plane of occurrence. Veins 3 inches wide or less abound in these minerals, mixed with a multitude of acicular crystals of kaliophilite.
Page 60 - ... we have no standard of comparison in the whole Polynesian region by which the species could be compared with those of Tertiary beds of known age; but the fossils have every characteristic of those generally assigned to the Pliocene or upper Miocene in their general aspect, and stite of fossilization To sum up, it is concluded that the reef rock of Pearl Harbor and Diamond Head limestones are of late Tertiary age, which may correspond to the Pliocene of west American shores, or even be somewhat...
Page 24 - ... the leeward side, together with the Waianae wind gap. Two or more lengthy ridges have been mentioned as protruding easterly from Kaala. In later times Koolau came up from the depths and poured over the skeleton ridges on the east side of Kaala, so as to conceal them from view, and...
Page 56 - Koolau extended out to sea several miles farther to the northeast than at present. 4. Coralline and molluscan limestones commenced to grow as soon as the reef-building animals could migrate hither. Doubtless the work commenced in the first period, and has continued ever since, coeval with the other phases of growth. If we were to judge of age from the amount of work accomplished we should say the earlier stages of growth correspond to the work done elsewhere in the later Tertiary.
Page 56 - Doubtless the work commenced in the first period, and has continued ever since, coeval with the other phases of growth. If we were to judge of age from the amount of work accomplished we should say the earlier stages of growth correspond to the work done elsewhere in the later Tertiary. The slow upbuilding of the volcanic domes and their subsequent erosion required an immensely long period for their accomplishment. The island was also a thousand feet higher than at present, if the Darwinian theory...
Page 56 - The tuffs came up through coral reefs, the land probably being lower than at present ; vegetation as flourishing as at present. Five substages indicated along Oahu Railway and Land Company near Moanalua station. 11. Decay of the surface of the tuff and, of course, of all the other rocks, so as to produce soils. 12. Discharge of ashes from Tantalus, Punchbowl, Diamond head, Koko head, and elsewhere, followed by showers of stones. 13.
Page 54 - It seems certain that the shells lived on the mountain and were not brought down in streams from a distance. The vegetation must have been more abundant than now, because the shells are such as are now found in moist localities. As to the species, at least five genera are represented, all such as have their representatives in the valleys of Oahti, though some of the species may be extinct.
Page 44 - HI before reaching port from the east, and again upon resuming their voyage. Artists have vied with one another in efforts to display this beautiful hill on paper or canvas, and every one is interested in viewing the channeled water-courses upon the outside and the barren rocks as contrasted with the rice fields, cocoanut groves, and the green plain of Waikiki, a health resort, close to the city at its base. It is a truncated hollow cone, 4,400 feet in the greater diameter of the rim, and 4,300 in...

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