GEOLOGY AND PALEONTOLOGY OF THE CANAL ZONE. 47 



6021}.. — Section in railway cuts near New Frijoles. 

 a. Oligocene — Culebra formation. 

 Dark, basic, orbitoidal, tufaceous material. 



Many worn central portions of Orbitoids and a very few other 

 foraminifera poorly preserved. 

 6025. — Oligocene — Culebra formation (upper part). 



About 200 yards south of southern end of switch at Bohio 



Ridge station relocated line Panama Railroad. 

 Contains a number of species of foraminifera but for the most 

 part broken or poorly preserved. 

 6026. — Two miles south of Monte Lirio. 

 Somewhat coarse-grained sandstone. 

 Few poor specimens of foraminifera. 

 6029. — Section one-half mile from Camp Cotton, toward Monte Lirio, 

 at big curve on railroad. Miocene — Gatun formation. 



a. Bluish, fossiliferous argillite. 

 Very few foraminifera. 



b. Bluish argillite. 



Few foraminifera, but considerably more than in a. 



c. Bluish, fossiliferous argillite. 



Very few poor specimens of Amphistegina. 

 6030- — Railroad cut north side of Big Swamp, one and one-half miles 

 north of Monte Lirio. Miocene — Gatun formation. 

 Bluish gray, argillaceous beds. 



The only foraminifera consisted of a single specimen of Trilo- 

 culina. 

 6031. — Section in cut one-half mile west of Camp Cotton toward 

 Gatun. Miocene — Gatun formation. 



Conglomerate bed and sandy marl 1 foot above. 

 A few poorly preserved specimens of Quhiquelo culina were the 

 only foraminifera. 

 6033. — Generalized section of the bluffs exposed along the Panama 

 Railroad, relocated line, about 3,500 feet south of Gatun Railroad 

 Station. Miocene Gatun — formation. 



c. Dark-colored, marly, fossiliferous clay. 



Rich in foraminifera, especially in specimens. A fair number 

 of species, well preserved. 

 6035. — Vicinity of Mindi Hill. Miocene — Gatun formation. 

 Gray-green, fine grained sandy shell marl. 

 Very fine-grained material, but with numerous species and speci- 

 mens of foraminifera representing an off-shore assemblage. 

 6036. — Monkey Flill, Mount Hope Station. Miocene — Gatun for- 

 mation. 



Dark-colored, fine grained, sandy clay marl. 



