540 BULLETIN 103, UNITED STATES NATIONAL MUSEUM. 



Section in Railway Cuts Near New Frijoles. 

 Oligocene: 



Emperador limestone — Feet thick. 

 60246-5. Rio Agua Salud: Argillaceous, cream-colored 

 limestone; fossil corals in base (Stylophora, 

 Acropora, etc.), also Pecten, echinoids, etc. 

 The limestone is bedded and has clay part- 

 ings. Dip about 10° W 10 



Culebra formation— 



6024a-4. Rio Agua Salud: Dark, basic, tufaceous ma- 

 terial, Heterosteginoid.es panamensis, Num- 



mulites panamensis 10 



Bohio conglomerate? — 



3. Small pebble conglomerate, fairly well bedded 30 



a. Fairly well-bedded conglomerate, with pebbles, 



cobbles, and boulders well rounded and in con- 

 siderable variety but largely of hornblende- 

 andesite and diorite facies. Largest boulders 2 

 feet in diameter. Matrix consists of sand, clay, 



etc. Dip35°S 300 



2. Dark, basic, orbitoidal, tufaceous material; bedding 

 not distinct. Probably a part of Bohio conglomer- 

 ate 20 



b. Gray, thick-bedded, coarse-grained, somewhat 



basic, sandy, foraminiferal material. Dip 35° 



S. W. Roughly estimated at 400 



a. Grayish, massive, argillaceous to sandy material; 

 bedding not distinct. Probably part of Bohio 

 conglomerate 



Unconformity. 



Eocene? (Las Cascadas agglomerate (?)): 



1. Dark, fairly well cemented andesitic agglomerate; shows 

 some rough bedding, contains subangular fragments of 

 basalt and andesite from less than an inch to more than 2 

 feet in diameter. Matrix dark, fine-grained, andesitic 

 tuff. Exposure behind New Frijoles railway station. 

 Strike seems to be about N. C0° E., dip 30° W. Ex- 

 posed 70 



Section Showing Chief Railway Cuttings and Outcrops Along the Panama Railroad 

 Between Bohio and Monte Lirio. 



Miocene (Gatun formation (?)): Feet thick. 

 4. Monte Lirio: Fairly hard, sandy, drab-colored clay stone. 

 Massively bedded and dipping about 7° northward; the 

 clay weathers slightly buff-colored and contains white 

 powdery particles like some of the clayey sandstone 

 beds of the Gatun formation. No fossils found. Ex- 

 posed 50 



Oligocene: 



Culebra formation (upper part)— 



6025-3. b. Bohio switch: Light-colored, fairly coarse- 

 grained, soft, somewhat limy sandstone with 

 Nummulites panamensis, Lepidocyclina chap- 



