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From Coy Inlet to Port Desire, a distance of 230 miles, it is certainly continuous; and I have reason to believe that it likewise extends to the Rio Chupat, Nuevo Gulf, and San Josef, a distance of 570 miles: we have, also, seen that a single layer occurs at the Rio Negro.
There are great rivers emptying into the sea here, the Cobu Leofu, Rio Negro, the Balchitas, the Chupat Desire and Rio Chico all water-ways which are opening up the country. Argentina is as large as all Eastern and Central Europe together and is enormously rich in mineral and natural products.
These pumice pebbles, no doubt, were originally brought down from the Cordillera by the rivers which cross the continent, in the same way as the river Negro anciently brought down, and still brings down, pumice, and as the river Chupat brings down scoriae: when once delivered at the mouth of a river, they would naturally have travelled along the coasts, and been cast up during the elevation of the land, at different heights.
Specimens brought to me from the uppermost bed, north of the Rio Chupat, consist of this same substance, but of a whiter colour.
I suspect the plains of Patagonia, like those of Australia, are traversed by many watercourses, which only perform their proper parts at certain periods. Probably this is the case with the water which flows into the head of Port Desire, and likewise with the Rio Chupat, on the banks of which masses of highly cellular scoriae were found by the officers employed in the survey.
Through the southern portion of the Argentine Republic flow the rivers Colorado, Negro, and Chupat. On the banks of the latter a Welsh colony has been established; while in various parts of the republic numerous other settlements have been formed by Europeans.
I suspect the plains of Patagonia like those of Australia, are traversed by many water-courses which only perform their proper parts at certain periods. Probably this is the case with the water which flows into the head of Port Desire, and likewise with the Rio Chupat, on the banks of which masses of highly cellular scoriae were found by the officers employed in the survey.
Tertiary strata, such as here described, appear to extend along the whole coast between Rio Chupat and Port Desire, except where interrupted by the underlying claystone porphyry, and by some metamorphic rocks; these hard rocks, I may add, are found at intervals over a space of about five degrees of latitude, from Point Union to a point between Port S. Julian and S. Cruz, and will be described in the ensuing chapter.
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