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Updated: May 27, 2025
The next afternoon George's invincible energy took both himself and the great bearded man, Edwin, to a certain spot on the hollow confines of the town towards Turnhill, where there were several pits of marl and clay. They stared in silence at a vast ochre's-coloured glistening cavity in the ground, on the high edges of which grew tufts of grass amid shards and broken bottles.
Marl improves the physical condition of stiff soils only when used in large amount per acre, and this is true of any carbonate form, such as limestone. Little effect upon physical condition should be expected from the light application usually given when marl is purchased and transported some distance to the farm.
There should be no confusion of a lime marl with the so-called "green sand" marl. The latter is low in lime, and may be acid, the value of the marl being in a considerable percentage of plant food contained. Oyster Shell. Ground oyster shell is a good source of carbonate of lime. The percentage falls below that of limestone, but in addition there is a little nitrogen and phosphoric acid.
In many parts of France in Auvergne, for example strata occur of limestone, marl, and sandstone hundreds of feet thick, which contain exclusively fresh- water and land shells, together with the remains of terrestrial quadrupeds.
Can these flames be attributed to the decomposition of water, entering into contact with the pyrites dispersed through the schistose marl? or is it inflamed hydrogen that issues from the cavern of Cuchivano?
The Land being of several sorts of Compost, some stiff, others light, some marl, others rich black Mould; here barren of Pine, but affording Pitch, Tar, and Masts; there vastly rich, especially on the Freshes of the Rivers, one part bearing great Timbers, others being Savanna's or natural Meads, where no Trees grow for several Miles, adorn'd by Nature with a pleasant Verdure, and beautiful Flowers, frequent in no other Places, yielding abundance of Herbage for Cattle, Sheep, and Horse.
Heads that had drooped in discouragement were raised. The cattle keep increased, and with it came the farmer's wealth. Marl changes the character of the heath soil; with manure to fertilize it there was no reason why it should not grow crops none, except the withering blast of the west wind. The time for Dalgas to preach tree planting had come.
The compact basalt alternates with the strata of porous basalt and marl. M. Hauy considers it a variety of the pyroxene. The porous basalt, which passes into mandelstein, has oblong cavities from two to eight lines in diameter, lined with chalcedony, enclosing fragments of compact basalt.
The sides were now entirely uniform in substance, in color and in lateral direction, the material being a very black and shining granite, and the distance between the two sides, at all points, facing each other, exactly twenty yards. The diary goes on to state that they explored three chasms, and that in a fissure of the third of these Peters discovered some 'singular-looking indentures in the surface of the black marl forming the termination of the cul-de-sac. It is surmised by Pym and Peters that the first of these indentures is possibly the intentional representation of a human figure standing erect, with outstretched arm; and that the rest of them bore a resemblance to alphabetical characters such, at least, it seems from Pym's diary, was the 'idle opinion' of Peters.
The soil of St Thomas consists of a red and yellow marl, or clay, of great fertility, which is kept soft and mellow by the heavy dews which fall nightly, contributing greatly to vegetation, and preventing it from being dried up by the great heats; and so great is the luxuriant fertility of the soil, that trees immediately spring up on any spots left uncultivated, and will grow as high in a few days as would require as many months with us.
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