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Updated: May 16, 2025
The earliest monuments of the Tertiary Period in that region are lacustrine deposits of great thickness, in the lowest conglomerates of which are rounded pebbles of quartz, mica-schist, granite, and other non-volcanic rocks, without the slightest intermixture of igneous products.
In course of time Sedentary replaced Nomad races; shell heaps, some of marine, some of riverine and lacustrine species, but all alike mixed with a great variety of rubbish, were gradually piled up extending for many miles and covering many acres of ground, bearing witness to the existence of a population already considerable. Group of sepulchral mounds.
Now, if a second pit be sunk through the same continuous lacustrine FORMATION at some distance from the first, nearly the same series of beds is commonly met with, yet with slight variations; some, for example, of the layers of sand, clay, or marl, may be wanting, one or more of them having thinned out and given place to others, or sometimes one of the masses first examined is observed to increase in thickness to the exclusion of other beds.
It was more than probable. Dick Sand and his friends were already out of reach, and in a few moments, under the impetus of this current, now changed into a kind of rapid, they had lost sight of the lacustrine village. "To the left bank!" Dick Sand ordered, as being more prudent. "The stream is again navigable." "To the left bank!" replied Hercules, giving the oar a vigorous stroke.
He arrived rather later than usual at his office, and he found his letters already on his table. There was one, long and official-looking, with a printed letter-heading on the outside, and Lapham had no need to open it in order to know that it was the offer of the Great Lacustrine & Polar Railroad for his mills.
In the state of New York, the mastodon is not unfrequently met with in bogs and lacustrine deposits formed in hollows in the drift, and therefore, in a geological position, much resembling that of Recent peat and shell-marl in the British Isles, Denmark, or the valley of the Somme, as before described.
The Great Lacustrine & Polar Railroad has leased the P. Y. & X. for ninety-nine years, bought it, practically, and it's going to build car-works right by those mills, and it may want them. And Milton K. Rogers knew it when he turned 'em in on me." "Well, if the road wants them, don't that make the mills valuable? You can get what you ask for them!"
Great lakes have disappeared lofty mountains have been formed, by the reiterated emission of lava, preceded and followed by showers of sand and scoriae deep valleys have been subsequently furrowed out through masses of lacustrine and volcanic origin at a still later date, new cones have been thrown up in these valleys new lakes have been formed by the damming up of rivers and more than one assemblage of quadrupeds, birds, and plants, Eocene, Miocene, and Pliocene, have followed in succession; yet the region has preserved from first to last its geographical identity; and we can still recall to our thoughts its external condition and physical structure before these wonderful vicissitudes began, or while a part only of the whole had been completed.
Even if the imbedded fossil shells of the loess had been lacustrine, instead of being, as we have seen, terrestrial and amphibious, the vast height and width of the required barrier would have been fatal to the theory of a lake: for the loess is met with in great force at an elevation of no less than 1600 feet above the sea, covering the Kaiserstuhl, a volcanic mountain which stands in the middle of the great valley of the Rhine, near Freiburg in Breisgau.
The ancient borders of the lake wherein the fresh-water strata were accumulated may generally be traced with precision, the granite and other ancient rocks rising up boldly from the level country. The actual junction, however, of the lacustrine beds and the granite is rarely seen, as a small valley usually intervenes between them.
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