. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. branner: the stone reefs of brazil. 243 At Marceneiro Point coral reefs are exposed on the beach at low tide with the calcareous beach sands lapping over them. In the bank above the beach are exposed the partly consolidated calcareous sandstones shown in Fig. 58, p. 90. Pontes and corallines are the commonest forms in the reef here. At the bottom of the embayment south of Marceneiro there are coral reefs along almost all of the beach, and soft calcareous sandstone is exposed in the 1 to metres bank above
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. branner: the stone reefs of brazil. 243 At Marceneiro Point coral reefs are exposed on the beach at low tide with the calcareous beach sands lapping over them. In the bank above the beach are exposed the partly consolidated calcareous sandstones shown in Fig. 58, p. 90. Pontes and corallines are the commonest forms in the reef here. At the bottom of the embayment south of Marceneiro there are coral reefs along almost all of the beach, and soft calcareous sandstone is exposed in the 1 to metres bank above it. These coral reefs rest directly upon Tertiary _ KT Fig. 98. Section showing the relations of the coral reef to the Tertiary at Barra do Passo. There is a decided break in the coral reefs off the mouth of Rio Cama- ragibe, and they appear to begin again only five kilometres south of that stream. Thence southward to Ponta Verde north of Maceio the coral reefs are more broken and fragmentary than they are to the north. These fragmentary reefs were not examined except where they lie along the beach. Some of the beach exposores are of more than usual inter- est on account of their showing the relations of the coral reefs to the stone reefs and to the eroded Tertiary strata of the land. South of Rio Santo Antonio Grande the coral reefs for two or three kilometres are almost connected with the beach, — perhaps quite so at the lowest tides. At the point kilometres south of Rio Sapucahy there is a sandstone reef overlying the coral I'eef. In view of the importance of this locality in showing the geologic relations of the stone and coral reef, I repeat here what has been given in the description of the Sapucali^ stone reef: "Following the beach southward from the mouth of the Sapucahy [a small river of the State of Alagoas about thirty kilometres northeast of Maceio] it curves gradually seaward and then back landward again, forming a sandy point, part of whicli is
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