388 THE CKETACEOUS AND TEltTIAKY GEOLOGY 



bluft' many well-preserved specimens of EcJiinohrissus freltasil, AVhite, wei'e fonnd. 

 Below this point another and similar exposure of cream-colored to gray oolitic rocks, 

 about seventy-five feet high, is known as Imbira. The rocks here dip about 30°, S. 

 70° E. These oolitic limestones are Aveathered along the joints, and contain many 

 large caverns from whose roofs stalactites descend to their floors. 



At Canna Brava white to gray oolitic rocks dip S. 45° W. at a low angle. Below 

 Canna Brava, at a locality on the west side of the river, known as Toque, are good 

 exposures of limestone. These rocks are somewhat metamorphosed in places, and 

 only one bed yields many fossils. The rock is firm and compact, and weathers in 

 jagged, irregular masses which, when struck with the hammer, ring like " clink- 

 stones," from which peculiarity the place doubtless takes the name " Toque." In a 

 few places caverns are developed in it. The beds here dip about 20°, S. 65° E. 



About a thousand feet below Toque similar beds are exposed at Capoeira on both 

 sides of the river. On the west side these form a blutf about one hundred feet high. 

 Being veiy compact and partially metamorphosed, they furnish but few fossils, and 

 these come from a sing-le stratum and bear a strong resemblance to those found 

 at the Lastro locality near Maroim. The exposures on the left bank of the river dip 

 13°, IS". 70° W., while upon the right bank the dip appears to be S. 70° E., angle not 

 determined. Kocks similar to these are exposed again further down the river at sev- 

 eral places, the most impoi'tant one being known as the Pedra Branca. Here they 

 are exceedingly compact and partially metamorphosed, in places resembling marble, 

 while the fossils have been almost entirely obliterated, the ones found having a general 

 resemblance to those of the Lastro locality. The exposed upper surfaces of the rocks 

 weather in sharp, jagged points. 



Half a mile from this point on the river, at the margin of the mangue, are found 

 i'ragments of a bed of limestone cropping out at the base of the hills, which fragments 

 contain a great many flint nodules. 



Tlie only other exposure of importance on this stream, that is, on the Rio Sergipe 

 proper, and below the last-mentioned place, is at the limestone quarries of Andorinhas. 

 At several places soft, civam-colored flagstones are quai'ried both for ])aving hitones 

 and foi- making lime. Fn general appearance these limestones resemble those quai'ri(d 

 at Sapucary, though they aie not (juite so ])ure or so fine grained. These rocks 

 contain occasional imperfect im|)ressions of large cephaloi)ods and the remains of 

 decapod crustaceans. The dip here is generally toward the east, though the rocks 

 have some appeaiance of being flexed. 



The next exposures down stream are those of the Sapucary quarries on the west 



