Tracing the lines of descent of various animals and plants of the present backward through the divisions of geologic time, we find that these lines of descent converge and unite in simpler and still simpler types.
These crude divisions would be of much value if, as in the case of geologic time, we had no exact reckoning of human history by years.
In the embryonic stages of its growth the individual passes swiftly through the successive stages through which its ancestors evolved during the millions of years of geologic time.
On the basis of these few fossils we may be confident that the strata in which they were found in the antarctic region were laid in the same period of geologic time as were the Cretaceous rocks of the United States and Canada.
It appears from the limb proportions in the Neanderthal race that the partly erect attitude and walking gait were assumed much earlier in geologic time than we formerly imagined.
For example, I have placed the famous Piltdown man, Eoanthropus, in a comparatively recent stage of geologic time, an entirely opposite conclusion to that reached by Doctor A.
Manifestly the earth can not have been ready for habitation before the passage of that epoch, and so the computation yields a superior limit to the extent of geologic time.
The earliest computations of geologic time, as well as the majority of all such computations, have followed the line of the most familiar and fundamental of geologic processes.
Even in the Archeozoic the rocks testify to a climate seemingly not greatly different from that of the average of geologic time.
Barrell: Rhythms and the Measurements of Geologic Time; Bull.
Throughout most of geologic time, as we shall see again and again, the climate of the earth has been milder than now.
These early men apparently hunted the bison and now-extinct elephant-like mammoths that roamed the Palo Duro area during the Ice Age of Pleistocene time (see geologic time scale, fig.
The surface rocks are of Tertiary and Quaternary age (see geologic time scale, fig.
However, some forms have remained virtually unaltered while others have become extinct at different points in geologic time.
Because they were formed early in geologic time, these rocks are normally found deeply buried beneath younger rocks which have been deposited on top of them.
But for the lapse of geologic time in which man has so far lived, Yellowstone has cornered the world's geyser market.
Rock begat rock, undoubtedly, and the aerial forces played the chief part, but the origin of each kind is hidden in the abyss of geologic time, as is that of the animal species.
The record of the rocks reveals to us the relation of species, and their succession in geologic time, but gives no hint of their origin.
Back in geologic time we had a ruminant with four horns, two on the nose and two on the crown, and they were real, permanent, bony growths.
It was the law of superposition, however, that led the early geologists to establish the first geologic timescales and to realize the enormous extent of geologic time.
Things are always changing and moving—not very rapidly, perhaps, but fast enough, in geologic time, to raise mountains and shift oceans.
The Manhattan Project[3] made the atomic bombs that ended the fighting; it also developed new scientific techniques that could be applied, when peace returned, to the measurement of geologic time.
I was in the presence of Geologic Time, and was impressed by the scarred and lichen-coated veteran without knowing who or what he was.
Surely a long journey, stretching through immeasurable epochs of geologic time, and attended by vicissitudes of which we can form but feeble conceptions.
See what the god of erosion, in the shape of water, has done in the river valleys and gorges--cut a mile deep in the Colorado canyon, and yet this canyon is but of yesterday in geologic time.
What takes place among our domestic animals of a summer day is by no means a safe guide as to what befell their ancestors in the abysses of geologic time.
In the yesterday of geologic time, humanity was not.
In the to-morrow of geologic time, it will not be.
Flowering plants of the Recent Epoch of geologic time (in which we are now living) had not yet made their appearance.
Just suppose they had been uncovered a million years ago—only a second in geologic time.
The lizards, snakes, turtles, and the tuatera of New Zealand belong to other subclasses of reptiles which have been distinct from that of the dinosaurs as far back in geologic time as we can trace them.
The above list will hopefully provide you with a few useful examples demonstrating the appropriate usage of "geologic time" in a variety of sentences. We hope that you will now be able to make sentences using this group of words.
