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Morton and Mr. Conrad came after their investigation of the fossils in 1834. The strata consist chiefly of green sand and green marl, with an overlying coralline limestone of a pale yellow colour, and the fossils, on the whole, agree most nearly with those of the Upper European series, from the Maestricht beds to the Gault inclusive.
Of the vegetation of such islands we have scarcely any indication, but it consisted partly of cycadaceous plants; for a fragment of one of these was found by Captain Ibbetson in the Chalk Marl of the Isle of Wight, and is referred by A. Brongniart to Clathraria Lyellii, Mantell, a species common to the antecedent Wealden period.
Holt, glancing at the stream with a sort of home affection 'our clear emerald Ottawa, fresh from the virgin wilderness; and it hasn't quite mingled with its muddy neighbour yet, no more than we Westerns can comfortably mingle with the habitans and their old-world practices down here. You see, Wynn, the St. Lawrence has been running over a bed of marl for miles before it reaches Lake St.
Against the sword of Michael, against the thunder of Jehovah, against the flaming lake, and the marl burning with solid fire, against the prospect of an eternity of unintermitted misery, his spirit bears up unbroken, resting on its own innate energies, requiring no support from anything external, nor even from hope itself.
We here see at the bottom of the cliffs, beds containing sharks' teeth and sea-shells of extinct species, passing above into an indurated marl, and from that into the red clayey earth of the Pampas, with its calcareous concretions and the bones of terrestrial quadrupeds.
At the point a was an opening about six feet wide, and extending fifteen feet into the rock, where it terminated in a bed of marl, there being no other chasm beyond, as we had expected.
Then she is turned into charcoal, into tar, and a score of other things of use. The men who do the planting in summer find chopping to do in winter in the older plantations, at good wages. Money is flowing into the moor in the wake of the water and the marl. Roads are being made, and every day the mail-carrier comes.
But this reasoning proceeds on mistaken data, for clay, marl, shale, and slate often contain a considerable proportion of alkali, so much so as to make them frequently unfit to be burnt into bricks or pottery, and the Old Red Sandstone in Forfarshire and other parts of Scotland, derived from disintegration of granite, contains much triturated feldspar rich in potash.
And these prodigious slabs of gneiss now lay amidst schistous marl and calcareous rock. Farther down in the valley was a small village of which the houses were dwarfed by a gloomy strong hold, apparently of the fifteenth century, whose four high and massive towers, occupying the angles of a small quadrilateral, gave it the appearance of a vast donjon.
In the eastern half, near Maldonado, this deposit is more arenaceous than in the Pampas, it contains many though small concretions of marl or tosca-rock, and others of highly ferruginous sandstone; in one section, only a few yards in depth, it rested on stratified sand.
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