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Updated: June 26, 2025
Through its magic leading he retraces his journeys through physiography and geology, watching the sea wear away two thousand feet of the Appalachian Mountains and spread the detritus over vast areas, making the great fertile corn and wheat belt of our country.
This fringe consists of coral-sand and detritus thrown up from the lagoon-channel, and of soil washed down from the hills; it is an encroachment on the channel, analogous to that low and inner part of the islets in many atolls which is formed by the accumulation of matter from the lagoon. The lagoon channels may be compared in every respect with true lagoons.
In many other of our Southern rivers, as along the shore from the Mississippi to the Hudson, the streams have not brought in enough detritus to fill their drowned valleys, which have now the name of bays, of which the Delaware and Chesapeake on the Atlantic coast, and Mobile Bay on the Gulf of Mexico, are good examples.
If by any chance the supply of detritus is increased, they fill in between the horns, diminish the incurve of the bay, and so cause its beach to be more exposed to heavy waves. If, on the other hand, the supply of grist to the mill is diminished, the beach becomes more deeply incurved, and the wave action is proportionately reduced.
The Mediterranean is a charming sea in summer, but in winter is a good deal like the Atlantic. The cause of the blueness of its water is not completely settled; but its sharing this color with Lake Geneva, which is tinged with detritus from the shore, might lead one to ascribe it to substances held in solution.
The agents which assist gravitation in bearing this detritus downward are many, but they all work together for the same end.
They lie as they were left in the far-away Palæolithic Age, and they have lain there till taken away by the modern explorer. But this is not the case with all the Palæolithic flints of Thebes. In the year 1882 Maj.-Gen. Pitt-Rivers discovered Palæolithic flints in the deposit of diluvial detritus which lies between the cultivation and the mountains on the west bank of the Nile opposite Luxor.
I dare say the deforestation of the country, which prevented the downflow of the rivers choking up their beds with detritus and producing stagnant pools favourable to the breeding of the mosquito has helped to spread the plague in many parts of Italy. In Horace's days Venosa was immune, although Rome and certain rural districts were already malarious.
But the overflow continuing, all the rubbish, slime, and detritus which the cavern contained was disgorged on the following days; a veritable bone-yard came down from the mountain: skeletons of animals of every kind of quadrupeds, birds, and reptiles in short, all that one could conceive as most horrible.
On some old roofs, which have decayed, and upon which detritus has accumulated, wallflowers may be found; and the house-leek takes capricious root where it fancies. The stonecrop is the finest of roof-plants, sometimes forming a broad patch of brilliant yellow. Birds carry up seeds and grains, and these germinate in moist thatch.
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