Sun-cracks never affect more than a few feet in thickness of clay, and are an insignificant structural feature of sedimentary rocks.
The shrinkage may result from the drying of sedimentary rocks; but more generally from the cooling of eruptive rocks.
Holmes, which shows the jagged surface of the igneous rock core and the sloping tables which still remain of the roof of sedimentary rocks (after Cross).
All of the geologic formations exposed in Palo Duro Canyon are composed of sedimentary rocks.
Bedding of this type commonly occurs in sedimentary rocks formed in rivers, deltas, and along the margins of lakes or oceans.
No sooner are residual weathered mantles formed or sedimentary rocks deposited, whether under air or water, than processes of consolidation begin.
Sedimentary rocks, as already indicated, consist principally of three groups, which for convenience are named shale, sandstone, and limestone.
Folded structures are most clearly discernible in sedimentary rocks, because of their stratified (layered) arrangement.
It would be most evident that the mountains consist of strata, that is sedimentary rocks, such as sandstone, shale and limestone, which were deposited under water.
Here as well as elsewhere the coal beds are interstratified with various kinds of sedimentary rocks, most commonly with shales and sandstones.
Sedimentary rocks, average composition of, 43; mass of, determined by sodium index, 47.
But are there any grounds for the 124 assumption that the compressive resistance of a complex of sedimentary rocks is inferior to one of igneous materials?
First among these events was the piling up, layer upon layer, of thousands of feet of sedimentary rocks under a wide variety of environments.
There are, therefore, in and adjacent to each chain, two classes of sedimentary rocks, the ancient and inclined beds, and the newer or horizontal.
Works of art, moreover, composed of the most indestructible materials, would have outlasted almost all the organic contents of sedimentary rocks.
This is obvious from the fact that the sedimentary rocks of one age are partly formed from the destruction of the sedimentary rocks of former ages.
We may infer that these ancient mountains were reduced along their margins to low plains, which were slowly lowered beneath the sea to receive a cover of sedimentary rocks.
These folia can be distinguished from the laminae of sedimentary rocks by their lenticular form and lack of continuity, and especially by the fact that they consist of platy, crystalline grains, and not of particles rounded by wear.
Besides variety of form, sedimentary rocksfurnish a wide range of color derived from mineral dyes dissolved out of rocks by erosion.
It produces scenic effects very different indeed from those resulting from volcanic and sedimentary rocks.
Much of the land is covered by a thin surface deposit of clay, sand, or gravel, which is yet loose material and which shows the mode of formation of sedimentary rocks.
The above list will hopefully provide you with a few useful examples demonstrating the appropriate usage of "sedimentary rocks" in a variety of sentences. We hope that you will now be able to make sentences using this group of words.
