1913-] 



REGION ABOUT NATAL, BRAZIL. 



453 



occurred in some of the beds. A small portion of a segmented 

 animal, probably a crustacean of some kind, is also in this collec- 

 tion. The plant remains are principally impressions of fragments 

 of palms and leaves of other plants. The principal importance of 

 these plants lies in the fact that they indicate estuarine conditions of 

 deposition. 



List of Fossils from the Limestones in the Region about Natal, 

 Rio Grande do Norte. 



Pelecypoda: 



Cardium soaresanum Rathbun . 

 Cardium (?) larger specimen. . 



Corbula (?) sp. ind 



Ostrea (?) 



Pholas (?) 



Gastropoda: 



Cerithium (?) mirimense, n. sp. 



Cerithium (?) sp. ind 



Cerithium (?) 



Natica (?) 



Turrilella (?) jacoquea, n. sp. . . 



Turritella natalensis, n. sp. ... 



Crustacean (?) 



Plants: 



Palms, etc 



Explanation. — I. is the railroad cut near Itapasaroca; J. is the quarry at 

 Jacoca; A. is the locality near Alvoredo; D. is the outcrop near Desterro. 



The Sandstone and Clay Series, 



The sandstone and clay series which overlies the limestone is 

 easily recognized by its peculiar character and color. It is a soft 

 quartz sandstone intermixed and interbedded with sandy clay and 

 with small pebbles up to boulders the size of a man's head. Its 

 color is usually a brick red, but varies from white to a dark red- 

 brown ; red, blue, yellow, and lavender are some of the commoner 

 shades. These sandstones must carry a large quantity of iron, for 

 its presence is very noticeable at surface exposures. Along the 

 sea-cliffs the leaching and concentrating is marked. It often forms 

 perpendicular bands in the rnaterial, alternating hard red columns 



