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The excerpt represents the core issue or deciding factor on which you must meditate, and is drawn from The Voyage of the Beagle by Charles Darwin: valley was formerly occupied by an arm of the sea. It i
needless in this work to detail the arguments leading to thi
conclusion, derived from the form and the nature of th
step-formed terraces on both sides of the valley, from th
manner in which the bottom of the valley near the Ande
expands into a great estuary-like plain with sand-hillock
on it, and from the occurrence of a few sea-shells lying i
the bed of the river. If I had space I could prove tha
South America was formerly here cut off by a strait, joinin
the Atlantic and Pacific oceans, like that of Magellan
But it may yet be asked, how has the solid basalt bee
The Voyage of the Beagle |
