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old

Geography (of a river, valley, or land surface) in the final stage of the cycle of erosion, characterized by flat extensive flood plains and minimum relief
References in classic literature ?
It must not be forgotten that, on my theory, all the species of the same genus have descended from some one species; so that if six genera, each having eight species, be found in one geological formation, and in the next succeeding formation there be six other allied or representative genera with the same number of species, then we may conclude that only one species of each of the six older genera has left modified descendants, constituting the six new genera.
He may ask where are the remains of those infinitely numerous organisms which must have existed long before the first bed of the Silurian system was deposited: I can answer this latter question only hypothetically, by saying that as far as we can see, where our oceans now extend they have for an enormous period extended, and where our oscillating continents now stand they have stood ever since the Silurian epoch; but that long before that period, the world may have presented a wholly different aspect; and that the older continents, formed of formations older than any known to us, may now all be in a metamorphosed condition, or may lie buried under the ocean.
I'm equal to a good deal o' work at present, thank God; but I'm getting older,--there's no denying that.
Nor was it generally understood that since Mars is older than our earth, with scarcely a quarter of the superficial area and remoter from the sun, it necessarily follows that it is not only more distant from time's beginning but nearer its end.
The older I grow, the more I am convinced that there is no education which one can get from books and costly apparatus that is equal to that which can be gotten from contact with great men and women.
As soon as it became known that General Armstrong would be pleased if some of the older students would live in the tents during the winter, nearly every student in school volunteered to go.
She was four years older than I, to be sure, and had seen more of the world; but I was a boy and she was a girl, and I resented her protecting manner.
Nevertheless, I stole furtive glances behind me now and then to see that no avenging mate, older and bigger than my quarry, was racing up from the rear.
I have not seen Bly since the day I left it, and I daresay that to my older and more informed eyes it would now appear sufficiently contracted.
He would not allow the older boys to impose upon me, and would divide his cakes with me.
No; he's looking older," said the gentleman of the bedchamber.
The Hardy sisters, Mary and Harriet, were both older than Louise.

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