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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
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
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.
To this, Mrs Nickleby only replied that she durst say she was very stupid, indeed she had no doubt she was, for her own children almost as much as told her so, every day of her life; to be sure she was a little older than they, and perhaps some foolish people might think she ought reasonably to know best.
'Five year older at the very least!' cried the other.
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.
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.
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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