But if, as some geologists suppose, a range of older rocks underlies the Weald, on the flanks of which the overlying sedimentary deposits might have accumulated in thinner masses than elsewhere, the above estimate would be erroneous; but this source of doubt probably would not greatly affect the estimate as applied to the western extremity of the district.
It is hardly possible for me even to recall to the reader, who may not be a practical geologist, the facts leading the mind feebly to comprehend the lapse of time.
The most skilful geologist, if his attention had been exclusively confined to these large territories, would never have suspected that during the periods which were blank and barren in his own country, great piles of sediment, charged with new and peculiar forms of life, had elsewhere been accumulated.
And in the distant future, a geologist examining these beds, might be tempted to conclude that the average duration of life of the embedded fossils had been less than that of the glacial period, instead of having been really far greater, that is extending from before the glacial epoch to the present day.
The circumstance of this enormous area being constituted of materials which most geologists
believe to have been crystallized when heated under pressure, gives rise to many curious reflections.
It is no doubt a curious formation," said I "but I am not geologist
enough to say that it is wonderful.
Instead of feeling a poverty when we encounter a great man, let us treat the new comer like a travelling geologist
who passes through our estate and shows us good slate, or limestone, or anthracite, in our brush pasture.
The neighbourhood of the upper Thames is rich in Roman relics, and my surmise seemed to me a very probable one; but our serious young man, who is a bit of a geologist
, pooh-poohed my Roman relic theory, and said it was clear to the meanest intellect (in which category he seemed to be grieved that he could not conscientiously include mine) that the thing the boy had found was the fossil of a whale; and he pointed out to us various evidences proving that it must have belonged to the preglacial period.
No doubt many a smiling valley with its stretching cornfields occupies exactly such a "horrid chasm," from which the waters have receded, though it requires the insight and the far sight of the geologist
to convince the unsuspecting inhabitants of this fact.
Indeed so very striking was the resemblance between the water and the land, that, however much the geologist
might sneer at so simple a theory, it would have been difficult for a poet not to have felt, that the formation of the one had been produced by the subsiding dominion of the other.
As a paradigm shift, it provided for many geologists
an opportunity to simplify their science and to relate issues that had previously seemed disparate.
would try to find the platinum layer, then follow it.
While x-ray diffraction is a useful tool in mineral identification, polarized light microscopy is the primary technique used by trained geologists
in mineral identification.
know that the canyon began to be eroded 4 million years ago and that the strata thus exposed reveal a 1.
have also burrowed in the Earth farther west at Frazier Mountain and toward the fault's southern extent in the badlands near Indio.