. Bulletin of the Geological Society of America. Geology. CABO BRANCO SANDSTONE REEF 49 At Cabo Branco a low reef about half a kilometer in length, of hard rough black rocks, barely uncovered at half tide, stands squarely out from the beach. Where examined near the shore these rocks are coarse sandstones, cemented with iron and barren of fossils. The rocks ex- posed in the cliff at Cabo Branco are chiefly sandstones. The lowest ones are the same as the dark red sandstones exposed in the reef offshore; next above this the rock is purple, red, and gray mottled clay. This clay ends a little more
. Bulletin of the Geological Society of America. Geology. CABO BRANCO SANDSTONE REEF 49 At Cabo Branco a low reef about half a kilometer in length, of hard rough black rocks, barely uncovered at half tide, stands squarely out from the beach. Where examined near the shore these rocks are coarse sandstones, cemented with iron and barren of fossils. The rocks ex- posed in the cliff at Cabo Branco are chiefly sandstones. The lowest ones are the same as the dark red sandstones exposed in the reef offshore; next above this the rock is purple, red, and gray mottled clay. This clay ends a little more than 1 meter above high-tide level. Overlying. Figure 4.—General View of Tertiary Sandstone Reef. the clay is a 5-meter bed of orange colored sands, false-bedded, with lumps and streaks of white kaolin splotching its exposed surface. This bed merges above into red and gray mottled sands and buff sands and loam at the top of the exposed face of the bluff. No fossils were found in any of these beds. The top of the hill at Cabo Branco is about 20 meters above high tide. This point of land is the ocean ward or eastern end of the plateau on which the city of Parahyba is built. The Cabo Branco hills continue as an unbroken bluff from 30 to 50 meters high in a northwesterly direc- tion to that city, while the peninsula ending at Cabedello at the mouth of the Rio Parahyba do Norte is a flat sandy plain lying north of this bluff. As the beds exposed at Cabo Branco contain no fossils, it is im- possible to say whether they are Tertiary or Cretaceous, but the strati- VIII—Bull. Geol. Soc. Vol. 13, 1901. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Geological Society of America. [New York : The Society]
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