We have hitherto been considering the strata as if they had remained permanent when once deposited, subject to no change, save the successive superposition of other strata upon them.
The proofs of Murchison's contention of the superpositionand newer age of the "Eastern gneisses" I always regarded imperfect, as often expressed both privately and publicly.
Every fresh examination of the ground increased the probability of their apparent superposition being merely overfoldings of the western rocks.
He confesses that he knows of "no locality where the geologist may better acquaint himself with the order of superposition of the ancient crystalline rocks of the Highlands, or with the dislocations and metamorphism which they have undergone.
An aristocratic society might accordingly be a perfect heaven if the variety and superposition of functions in it expressed a corresponding diversity in its members' faculties and ideals.
This kind of synthesis, thissuperposition and mixture of images into notions of physical objects, is not, however, the only kind to which perceptions are subject.
We should thus see more clearly how they approach their goal, which can be nothing but the complete superposition of these two characters.
Intensity of waves doubled by the superposition and coincidence of two equal systems.
Strata Smith’s” find was unheeded for many a long year; but at length the first geologists of the day learned from the land-surveyor that superposition of strata is inseparably connected with the succession of life in time.
The viewing of the exalted anagogic conception as a perspective vanishing point, makes allowance for the possible errors of superposition in the anagogic aspect of the elementary types.
This error of superposition is found not only in the view backward but in the forward view.
A star cluster must, of course, give a similar spectrum, resulting from the superposition of the spectra of the single stars in the cluster.
The test of age by superposition is strictly applicable to all stratified volcanic tuffs, according to the rules already explained in the case of other sedimentary deposits.
Many attempts have been made to trace a general order of succession or superposition in the members of this family; gneiss, for example, having been often supposed to hold invariably a lower geological position than mica-schist.
Their place in the series will best be understood by referring to the order of superposition of the successive deposits found in the neighbourhood of Paris.
We ascend the stream of time, as in our study of the relations of superposition we descend deeper and deeper through the different strata, in which lies revealed before us a past world of animal and vegetable life.
The second is more specially geognostic, considering fossil remains in their relations to the superposition and relative age of the sedimentary formations.
Nor am I aware thatsuperposition has defined in any clear instance the heterogeneous mixture of relics that usually turn up on crannogs.
These Gallic objects consisted of the well-known fibulæ and other articles characteristic of La Tène, so that superposition clearly indicates the Roman occupation to be posterior to that of its original constructors.
Thus, to express thesuperposition of one whorl upon another, a line is drawn between them, e.
On reaching the edge of the crater we find the gravel covered over by black and purple scoria or slag the superposition of the scoria on the gravel being visible in several places, showing that the former is of more recent origin.
Moreover, the same order of superposition was constant among the strata, as Werner, of whom Smith knew nothing, had indeed taught.
The very proof by superposition, notwithstanding its eminently geometrical character, stands in need of numeration, inasmuch as the superposition is repeated.
The test of superposition is most apt to be misleading when the strata have been affected by the faults known as reversed faults or thrust-planes.
When caverns occur beneath masses of land ice, the order of superposition may be misleading.
Recognising the difficulty of applying the ordinary test of superposition to deposits so scattered as are those of Tertiary age in north-west Europe, he in 1830, assisted by G.
The test of superposition is often applicable, and one is enabled to obtain some clue as to the relative order of events.
The test of superposition is applicable in that area also, the clay of the northern area being newer than the limestone of the same region.
Several of the islands are visible at Cumana, from the terraces of the houses, and they produce, according to the superposition of layers of air more or less heated, the most singular effects of suspension and mirage.
No well having been dug in these countries, we can have no information respecting the superposition of the strata.
The maximum effect produced by superposition of stimuli increases with the intensity of the constituent stimuli.
One effect of superposition of stimuli may be mentioned here.
With superposition of stimuli we have fusion of effects, analogous to the tetanus of muscle (fig.
With superposition of stimuli, a relatively high value is obtained in tin, amounting sometimes to nearly half a volt, whereas in silver the electromotive variation is only about ·01 of this value.
As a consequence of Fourier's theorem it follows that any periodic curve having any wave form can be imitated by the superposition of simple sine currents differing in maximum value and in phase.
For instance, the colour of a salt solution is the colour obtained by the superposition of the colours of the ions and the colour of any undissociated salt that may be present.
