﻿GEOLOGY AND PALEONTOLOGY OF THE CANAL ZONE. 125 



Station 6019b. — Panama Canal Zone. Las Cascadas section, Gail- 

 Jard Cut. Four feet of dark, stratified tuff and clay immediately- 

 overlying the lower limestone bed. Culebra formation (upper part). 

 Oligocene series. Collectors, D. F. MacDonald and T. W. Vaughan ; 

 1911. CalUanassa scotti Brown and Pilsbry. Callinectes, species, 

 Panopeus, species. 



Specimen in Museu/m, Academy of Natural Sciences, Philadel- 

 phia. — Costa Rica. Probably Culebra formation. Oligocene series; 

 labeled " Miocene." Collector, W. M. Gabb. CalUanassa scotti 

 Brown and Pilsbry. 



Station 6019c. — Panama Canal Zone. Las Cascadas section, Gail- 

 lard Cut. Lower part of lime-cemented soft gray to olive-colored 

 limestone, with central parting of dark clay. The first hard, limy 

 sandstone bed above the lower limestone and just above 60196. 

 Culebra formation (upper part). Oligocene series. Collectors, 

 D. F. MacDonald and T. W. Vaughan; 1911. CalUanassa vaughani 

 Rathbun (probably). CalUanassa ?, species. Hepatus, species. 



Station 6019e. — Panama Canal Zone. Las Cascadas section, Gail- 

 lard Cut. Third hard sandstone bed from bottom. Culebra forma- 

 tion (upper part). Oligocene series. Collectors, D. F. MacDonald 

 and T. W. Vaughan ; 1911. CalUanassa stridens Rathbun. 



Station 6012c. — Panama Canal Zone. Gaillard Cut. Top part of 

 limy sandstone below upper conglomerate, near foot of stairs. 

 Culebra formation (upper part). Oligocene series. Collectors, 

 D. F. MacDonald and T. W. Vaughan; 1911. Natantia, family, 

 genus, and species indeterminable. CalUanassa^ species. CalUnecteSy 

 species. Euryplaw culehrensis Rathbun. 



Station 6020a. — Panama Canal Zone. Las Cascadas section, 

 Gaillard Cut. Lowest fossiliferous bed. Third bed below lowest 

 limestone beds separated by rows of nodules. Culebra formation 

 (lower part of upper half). Oligocene series. Collectors, D. F. 

 MacDonald and T. W. Vaughan; 1911. Balanus {Hesperiha- 

 lanusf), sp. Axiiis 7'eticulatus Rathbun. CalUaiiassa oralis Rath- 

 bun. CalUanassa elongata Rathbun. CalUanassa crassimana Rath- 

 bun. CalUanassa spinulosa Rathbun. CalUanassa quadrata Rath- 

 bun. CalUanassa ahhreviata Rathbun. CalUanassa magna Rath- 

 bun. Goniochele f armata Rathbun. Calappella quadrispina Rath- 

 bun. CalUnectes reticulatus Rathbun. Thaumastoplax prima Rath- 

 bun. Brachyrhyncha, family, genus, and two species indeterminable. 



Station 6025. — Panama Canal Zone. About 200 yards south of 

 southern end of switch at Bohio Ridge station, relocated line Panama 

 Railroad. Foraminiferal marl and coarse sandstone. Culebra for- 

 mation (upper part). Oligocene series. Collectors, D. F. Mac- 

 Donald and T. W. Vaughan; 1911. Carpilius, species. 



