I found these two strata to be about equally fossilliferous, and I am unable to establish any palaeontological difference between them.
Near Fort Harker, certain strata contain large quantities of the remains (leaves chiefly) of dicotyledonous and other forms of land vegetation.
South of the river the yellow strata are more distinctly developed.
From Fort Hays to Fort Wallace, near the western boundary of the state, one hundred and thirty-four miles beyond, the strata present a tolerably uniform appearance.
This, with other indications, points to a gentle dip of thestrata to the north-west.
Here the bluffs rise to a height of two hundred feet, the yellow strata constituting the upper half.
The manuscript, as it lies before me, is entitled: "On the Geology and Vertebrate Palaeontology of the Cretaceous Strata of Kansas.
This distinction did by no means establish two different social strata among us.
I have been told that in higher social strata different lions are hunted by different hunters.
It was a specimen of another strata of nether world Bohemia.
Mr. Oldham showed how different strata are built up by the river on its bed, and how in the lowest of these strata there will be found the oldest relics of man.
At this stage the folds reached their breaking limit, and the strata broke in a number of places as indicated by dotted lines in the diagram.
Where the older, more massive strata overlie the soft rocks the mountains are terminated by precipitous walls as shown in section E.
Horizontal strata of sandstone and coarse conglomerate are exposed on its sides, and the summit is capped by thin stratum of compact sandstone, surmounted by a bed of greenstone trap, or trappea porphyry.
In visiting it we crossed a ridge of sandstone, about three hundred feet in height, with strata inclined to the west.
The rock is similar to that already mentioned, its strata having, however, less inclination than is observed nearer the base of the mountain.
The concentric strata thus deposited remain distinguishable externally, and thus the lines of growth marking the progressive increase of size may easily be traced.
Our seventeenth family are the Trigoniadæ, affording Trigonia, of which so many occurred in the Jurassic period of Geologic History in the strata of Europe, but of which two or three are alone left alive in the seas of Australia.
As a type of the second order, Ostracoda, we will specify the numerous family of the Cyprides, whose animals are enclosed in a bivalve shell, which causes their remains in Secondary strata to be classed with bivalve molluscs.
While the living forms range from one-fourth to the one-hundredth part of an inch, the tertiary strata abound in examples of Nummulites varying from the eighth of an inch to the size of half-a-crown.
Verily, I know not how my father could bear to look at those dumb fragments of himself,--strata of the Caxtonian conformation lying layer upon layer, as if packed up and disposed for the inquisitive genius of some moral Murchison or Mantell.
It is thought that if the frequency were low, or even more so if the charge were not at all vibrating, the lower dense strata would break down as in a lightning discharge.
But the upper strata of the air are conducting, and so, perhaps, is the medium in free space beyond the atmosphere, and these may contain an opposite charge.
A hill may have been built up by a glacier, while a mountain may be the product of volcanic forces or of the upheaval of the strata of the planet.
The crater is somewhat over four thousand feet in diameter, and the surrounding rim, formed of upturned strata and ejected rock fragments, rises at its highest point one hundred and sixty feet above the plain.
The rock strata (sandstone and limestone) of which the walls consist present every appearance of having been violently upturned by a huge body penetrating the earth like a cannon-ball.
Oolitic strata of Gloucestershire (1832), at the instigation of the Geological Society, and he laid down on the one-inch ordnance maps the boundaries of the various geological formations.
Heavy basement strata are more magnetic than the sedimentary rocks that cover them.
Since shock waves travel through the ground at different speeds and on different paths, depending on the strata that they strike, they will trace different kinds of lines on this strip of sensitized paper.
Such photographs show the pitch and strike of surface rockstrata and give you some idea of what formations lie beneath them.
After learning this much, he must immediately undertake to arrange the strata according to their ages.
Successive stratalike these, where they are parallel and obviously undisturbed, are evidently arranged in the order of their formation and age.
And at the same time that old strata are undergoing destruction new ones are in process of construction at other places, where animal remains can be embedded and preserved as fossils.
Thus the whole process of geological construction is such that older exposed strata continually undergo disintegration, but this involves the destruction of any fossils that they might contain.
For example, in one restricted locality in Germany the shells of snails belonging to the genus Paludina have been found in superimposed strata in the order of their geological sequence.
The valley in which the springs all occur indicates the line of a fault or fracture in the rocky crust, the strata on the west side of which are hundreds of feet above the corresponding strata on the east.
Sulphuretted or hepatic waters acquire their peculiar properties from beds of pyrites or by passing through strata of bituminous shale and foetic-oolitic beds.
Those from the deepest strata are the most concentrated.
It is "negative Eugenics" that has studied the histories of such families as the Jukeses and the Kallikaks, that has pointed out the network of imbecility and feeble-mindedness that has been sedulously spread through all strata of society.
Its last work is the misery of constantly extending strata of the army of labor, and the dead weight of pauperism.
They simply contain, as has been said, mineral materials derived from the primitive mass, and which appear to have been formed into strata in seas of vast depth.
Professor Philips has suggested, from the analogy of the mineral composition, that anciently elevated coal strata may have composed the dry land from which the sandy matters of these strata were washed.
That these disturbances took place about the close of the formation, and not later, is shewn in the fact of the next higher group of strata being comparatively undisturbed.
But the separate strata are each much more distinct in the matter of its composition than might be expected.
Land animal life would not have a place on earth; vegetation would be enormous; and coal strata would be formed from the vast accumulations of woody matter, which would gather in every sea, near the mouths of great rivers.
It is equally ascertained of the types of being prevalent in the old red, as of those of the preceding system, that they are uniform in the corresponding strata of distant parts of the earth; for instance, Russia and North America.
The ferns of the coal strata have been of this magnitude, and that without regard to the parts of the earth where they are found.
Dakota are probably the oldest Eocene strata of the Western Interior; they are some 2000 ft.
In the central and northern Apennines the Eocene strata have been subdivided by Prof.
Wood made two subsequent attempts to resume work, but failed; and the site lay desolate till 1904, when the trustees, wishing to have further information about the earlier strata and the Precinct, sent D.
The soil is generally a stiff loam, whose chief component part is the Tabatinga clay, which also forms low cliffs on the coast in some places, where it overlies strata of coarse sandstone.
The total height of the cliff is from thirty to sixty feet above the mean level of the river, and the clay rests on strata of the same coarse iron- cemented conglomerate which has already been so often mentioned.
On the top of the Tabatinga lies a bed of sand, in some places several feet thick, and the whole formation rests on strata of sandstone, which are exposed only when the river reaches its lowest level.
We have, therefore, in the Synoptists several different strata of legend and narrative, which in some cases intersect and in some are superimposed one upon the other.
For about three thousand feet the strata penetrated were of carboniferous and magnesian limestone alternating with sandstone.
During the summer half of the year the evaporation rather exceeded the rainfall; during the winter half the entire precipitation was absorbed by the soil and transmitted to lower strata by infiltration.
In such case the weight of such strata would be an additional, if not the sole, cause of the ascent of the water through the tubes of artesian wells.
It is said, however, that in many places in the mining regions of England alarming indications of a tendency to a wide dislocation of the superficial strata have manifested themselves.
One has, indeed, to clear away two strata of misrepresentation, that of our Government and Press and that of the German Government and Press; for the latter is as much opposed to the German revolution as the former.
There is nowhere any tableland, as at the Cape or in Colorado, with horizontal strata of rock cut down by water into valleys or cañons.
Just as the regular succession of rock-strata has been gradually learned, so the regular succession of different fossils is becoming more and more understood.
At what rate these materials would be distributed and precipitated in regular strata it is impossible to determine; but that volcanic materials were so deposited in layers is evident from the relative position of the earliest rocks.
Then how is it that when we examine the strata of rocks in our neighborhood, wherever that neighborhood may be, we do not find them so arranged?
It may seem at first sight as if we should have an easier task, if thestrata were all left lying just as they were first formed, in smooth level layers, one above another.
In both of these types there is evidence to shew that a part of the mesoblast is formed in situ at the same time as the hypoblast, from the lower strata of segmentation spheres.
At its inner end, this layer is continuous with the yolk-cells; and is divided into two strata (fig.
It consists of a core of mesoblast covered by a delicate layer derived from both strata of the optic cup.
The third of these layers gives rise to all the eventual strata of the retina proper, except the outer limbs of the rods and cones.
In these cases the two original strataof the epiblast are equivalent to those which appear at a later period in the other forms.
Of the two strata of the neural layer the outer is several cells deep, while the inner is formed of elongated rod-like cells.
Both of these strata eventually become the epiblast, of which they form the epidermic and nervous layers.
The complete differentiation of the epiblast is effected by the cells of the thickened edge of the blastoderm becoming divided into two strata (fig.
The cells both of the roof and the floor continue to increase in number, and those of the roof become divided into two distinct strata (fig.
This form of the surface generally prevails wherever the water-bearing strata are softer and less coherent than the strata above and below them.
If thestrata remained continuous and unbroken, we should merely have to ascertain the dimensions and lithological character of the strata in order to determine their water value.
The next strata in which water is found are the upper and inferior oolites, between which are the Kimmeridge and Oxford clays, which are separated by the coral rag.
As the surface, which is covered by the deposit, is extensive, the water circulates from a distance through permeable strataoften overlaid by others that are impervious.
The following detailed account of the strata is due to Prestwich.
A well, therefore, sunk in such strata will most probably furnish, besides the volume of the spring, an additional supply of water.
To sink a well by underpinning, an excavation is first made to such a depth as the strata will allow without falling in.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "strata" in a variety of sentences. We hope that you will now be able to make sentences using this word.
