It is proposed to give very briefly in this paper the results of studies of the stone reefs on the northeast coast of Brazil, which were made in connection with a general geological and geographical investigation of that region.

Location, Origin, and structural Features of the Reefs

The stone reefs of Brazil are mostly in an out-of-the-way part of the world. They lie along the northeast coast of that country, between south latitudes 3 degrees 43 minutes and 16 degrees 30 minutes. Only one of these reefs is where it is readily accessible to trans-Atlantic steamers, and th at is at the port of Pernambuco. The others are scattered along a coast which has no commodious harbors, and are therefore but little known outside of Brazil.

These stone reefs are unique or almost unique geologic phenomena. Darwin, who saw the one at Pernambuco, says of it that he doubts . . .

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