GEOLOGY AND PALEONTOLOGY OF THE CANAL ZONE. 543 



Large railway cutting a quarter of a mile from Camp Cottort, toward Monte Lirio. 



Miocene (Gatun formation) : Feet thick. 



2. Dark-colored clay with white particles embedded in it. . . 



1. Dark-colored marl, fossils as at the two previous localities. 



Dip about 6° N. 60° W 



In the next two exposures going toward Camp Cotton. 



2. Clay with white particles embedded in it 40 to 50 



1. Dark-colored marl, fossiliferous 60 



The lower beds exposed in the cutting one-half mile north of Camp 



Cotton are not exposed in the last-mentioned cutting. 



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



Miocene (Gatun formation): Feet thick. 



3. Marl, dark, blackish-gray when un weathered, brownish 



when weathered 15 



2. Clay parting 2 or 3 



1. Blackish-gray marl containing a conglomerate bed 35 



This bed may be divided into three parts: 



„.„ c. Sandy marl 



6. Conglomerate bed 2 feet. 



6032 a. Sandy marl with some pebbles 3 " 



The lower bed of No. 1 (station 6032) contains fossils characteristic of 

 the lower part of the Gatun formation. 



Generalized section of the bluffs exposed along the Panama Railroad, relocated line, about 

 3,500 feet south of Gatun railroad station. 



Miocene (Gatun formation): Feet thick, 

 4. Fine-grained, buff clays (fuller's earth) with mag- 



nesian-looking spots 25 



6033e?-3. Fine-grained, soft, yellow sandstones 70 



2. Buff, fine-grained, rather hard clay 25 



1. 6033c -c. Dark-colored, marly, fossiliferous clay 15-20 



6033& -b. Yellowish clay 4 



„ >-a. Layer of dark, fossiliferous clay, exposed. 28 



Section from top of hill at west end of Gatun darn to bottom of the spillway. 



Pliocene (Toro limestone): Feet thick. 



6034-3. Top of hill, limestone. A rather soft coquina lime- 

 stone composed of comminuted or broken tests of a 

 number of kinds of organisms 70 



Unconformity. 



Miocene (Gatun formation): 



2. Sandstone, surface oxidized brown 120 



1. Dark-colored marl 35 



Section at west end of the spillway. 



2. Yellowish or brownish, sandy clay; soil red 20 



5659/1. Dark-colored Gatun marl, with Amusium, dementia, 

 59001 etc 16 



