Limy or calcareousmuds were changed into limestone.
At intervals muds were laid down which later became consolidated into rocks known as "shales" and "argillites.
I have there advanced the view that the extensive silicification of the Kalikoso and Wainikoro plains took place during the consolidation of the calcareousmuds of a reef-flat whilst the land was emerging.
It is certainly true that the fossiliferous volcanic muds that form the foundations of coral reefs are often exposed at and near the coast; but the elevated reefs that ought to be found reposing on them are rarely to be observed.
The necessary conditions would, I think, be afforded by an emerging land-surface during the consolidation of the exposed calcareous muds and the subsequent draining of the new surface.
The first are usually palagonitic and calcareous and often contain organic remains, being usually associated with volcanic muds and clays mainly the product of marine erosion.
The former consist of intensely black muds with few fossils save graptolites, and a deposit of chert at the base which is composed of radiolaria.
Much of the material of the grits and muds may be derived from volcanic rocks, though how far this is so cannot be stated in the absence of information obtained by detailed petrological examination of the rocks.
In the finer sands and muds of sheltered tidal flats may be preserved the impressions from raindrops or of the feet of animals which have wandered over the flat during an ebb tide.
The littoral and shoal water deposits are mainly gravels and sands, while the offshore deposits are principally muds or lime deposits.
Next in order above the basal conglomerate, will follow the coarser and then the finer sands, upon which in turn will be laid down the offshore sediments—the muds and the lime deposits.
Relatively far from shore may be found the finest sands and muds or calcareous deposits, while near the shore are sands, and, finally, along the beach, beds of beach pebbles or shingle.
Such impurities make up the bulk of the clays andmuds which are left behind when the soluble portions of the limestone have been dissolved.
The sands and muds first consolidated into sandstone and shale below the earth's surface.
Near shore they are chiefly gravel and sands, while farther out they become gradually finer, and on the continental slope only very fine muds are deposited.
The less soluble portions--the waste brought in by streams and the waste of the shore--form the muds and sands of continental deltas.
From this section infer that during early Silurian times the area was sea, and thick sea muds were laid upon it.
The Mesozoic muds were hardened and squeezed into slates.
The Lower and the Upper Huronian consist in the main of old sea muds and sands and limy oozes now changed to gneisses, schists, marbles, quartzites, slates, and other metamorphic rocks.
When subsidence was most rapid and long continued the sea encroached far and wide upon the lowlands and covered the coal swamps with sands and muds and limy oozes.
Yellow and red muds occur where the amount of iron oxide in the silt brought down to the sea by rivers is too great to be reduced, or decomposed, by the organic matter present.
Muds are also found near shore, carpeting the floors of estuaries, and among stretches of sandy deposits in hollows where the more quiet water has permitted the finer silt to rest.
Sea muds are commonly bluish and consolidate to bluish shales; the red coloring matter brought from land waste--iron oxide--is altered to other iron compounds by decomposing organic matter in the presence of sea water.
The epicontinental sea was shoaled and narrowed, and muds were washed in from the adjacent lands.
Green muds and green sand owe their color to certain chemical changes which take place where waste from the land accumulates on the sea floor with extreme slowness.
The almost incessant rain-storms swept down upon it, and rivers and torrents carried great loads of sediment out to sea, to become muds that hardened later into slates and shales, and sands that became sandstones.
In its habits it is very like the Curlew, picking up its food on the muds and marshes, walking deliberately to and fro, wading through the shallows, and sometimes standing in the water breast-high to sleep.
It especially occurs in the green sands and muds which are gathering at the present time on the sea bottom at many different places.
If the change in form of the original muds was just sufficient to produce crystallization, we may have a marble full of fossil remains which may be of a white or pink color, standing out in fine contrast with the darker ground.
The trunks of trees washed down by the floods from far distant uplands were buried in these muds and sands, where, in the course of unnumbered centuries, they turned to stone.
Muds accumulated which to-day are seen in many highly colored shales.
The silts and muds constitute the outer fringe of the piedmont and are interrupted here and there where sands are blown upon them from the higher portions of the piedmont, or from the desert mountains and plains on the seaward side.
The wind-driven sand fills the cracks in the muds and is even drifted under the edges of the upcurled plates, filling the spaces completely.
I was prepared to find curled plates, wind-blown sands, and muds and silts, but they are almost wholly absent.
Off the African coasts there are large deposits of Glauconitic sands and muds at depths down to 1000 fathoms, and on banks where coral formation occurs there are large deposits of coral muds and sands.
As an example of the amount of organic matter which may remain stored in these muds for many years, the speaker would mention a sample taken from the bottom of a trench, which he had analyzed a few years ago.
Possibly before the existing available coal deposits are exhausted, the exploitation of meadow muds for fuel may become profitable.
Their shells were buried and preserved among the muds and limes which were accumulating, and today many of them are found in the rocks of this age.
In these muds are found preserved great quantities of ripple marks, indications of changing currents, also the moulds of salt crystals, and large shrinkage cracks resulting from a very hot sun.
From this section we infer that during early Silurian times the area was sea, and thick sea muds were laid upon it.
In a few places a red colour prevails, the iron being mostly oxidized; elsewhere the muds are green owing to abundant glauconite.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "muds" in a variety of sentences. We hope that you will now be able to make sentences using this word.
