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Updated: June 21, 2025
Just as men, when their culture and their warfare advanced, clothed themselves with armour, and the most completely mailed survived the battle, so, generation after generation, the thicker and harder-skinned animals survived in the Archaean battlefield, and the Cambrian age opened upon the various fashions of armour that we there described.
In most cases, the cells are connected in chains, and we begin to see the vague outline of the larger plant. When we had reached this stage in the development of animal life, we found great difficulty in imagining how the chief lines of the higher Invertebrates took their rise from the Archaean chaos of early many-celled forms.
Looked at from our point of view, the great geological processes often seem engaged in world-destruction rather than in world-building. Those oft-repeated invasions of the continents by the ocean, which have gone on from Archaean times, and during which vast areas which had been dry land for ages were engulfed, seem like world-wide catastrophes.
We have already traversed nearly nine-tenths of the story of terrestrial life, without counting the long and obscure Archaean period, and still find ourselves in a strange and unfamiliar earth. With the close of the Chalk period, however, we take a long stride in the direction of the modern world.
"Yes," he said half aloud, "you get your blast furnace." The Philadelphians took to the homeward trail with backward glances and something of regret lest the archaean foundations of that mountain of ore might shift over night. There was no sense of fatigue now.
We found it gravelly and desert-like, covered with cacti, low sagebrush, and other growths. The dim trail led us to its edge, where we could look down into the twelve-hundred-foot V-shaped gash which the river had cut into the dark, crude-looking Archaean rock.
To the inexpert it must seem strange that, whereas we must rely on pure speculation in attempting to trace the origin of life, we can speak with more confidence of those early developments of plants and animals which are equally buried in the mists of the Archaean period.
There is a great break here a leap from Archaean times on the east side to Mesozoic times on the west. The east side is millions of years the older. Here is the original Plutonic or Azoic rock which apparently has never been under the sea since it was first thrust up out of the fiery depths. The west shore, including the Palisades, belongs to a much later geologic era.
In thus declaring the impotence of geology, however, we are at the same time introducing another science, biology, which can throw appreciable light on the evolution of life. Let us first see what geology tells us about the infancy of the earth. The distribution of the early rocks suggests that there was comparatively little dry land showing above the surface of the Archaean ocean.
At the mouth of Bright Angel, they rest upon the archaean, with the Tonto sandstones above them, but just in front of the Battleship a break in the gneiss occurs, and on the portion nearest us the Algonkian strata totally disappear, for the Tonto strata rest directly upon the gneiss. Zoroaster, Brahma and Deva Temples.
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