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Updated: May 4, 2025
The shore-tracts and the shallow water are narrowed, the struggle is intensified in them, and we pass into the Silurian age with a greatly reduced number but more advanced variety of animals. In the Silurian age the sea advances once more, and the shore-waters expand. There is another great "expansive evolution" of life.
The sea retires with its inhabitants, mingling their various provinces, transforming their settled homes. A larger continent spans the northern ocean of the earth. In the shore-waters of this early continent are myriads of living things, representing all the great families of the animal world below the level of the fish and the insect.
Finally, we find a continuous and conspicuous advance among the fishes. At the close of the Triassic and during the Jurassic they seem to undergo profound and comparatively rapid changes. The reason will, perhaps, be apparent in the next chapter, when we describe the gigantic reptiles which feed on them in the lakes and shore-waters.
On the contrary, the deep-blue, pure waters of Lake Tahoe, rivaling in purity and blueness the sky itself; its clear, bright emerald shore-waters, breaking snow-white on its clean rock and gravel shores; the Lake basin, not on a plain, with mountain scenery in the distance, but counter-sunk in the mountain's top itself, these produce a never-ceasing and ever-increasing sense of joy, which naturally grows into love.
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