Bulletin (1910) (14576425160) - Public domain book illustration

Identifier: bulletin86unit (find matches)

Title: Bulletin

Year: 1910 (1910s)

Authors: United States. Bureau of Mines

Subjects: Mines and mineral resources Mines and mineral resources Mining engineering

Publisher: Washington U.S. Govt. Print. Off. (etc.)

Contributing Library: Gerstein - University of Toronto

Digitizing Sponsor: University of Toronto

Text Appearing Before Image:

sive, largely of terrestrial origin,contain little organic matter outside of the few Ugnitic shale bedsmentioned, have a greenish color from a high chlorite content, andare much more given to shding than the other rocks. EMPERADOR LIMESTONE. The Emperador is a light-colored, fairly pure limestone. It liesunconformably on several of the older beds. Its outcrops are com-paratively small and weather locally into a pitted and platy condi-tion. Near Las Cascadas a section cut by the canal (PI. VIII),shows the limestone, about 25 feet thick, overlying the upper partof the Culebra formation. It outcrops northwest of Empire, south ofLas Cascadas, on the new Une of the Panama Railroad, near San Pablo,near Frijoles,in the swamp southeast of Diablo Ridge, and extensivelynear Alliajuela. The formation also has prospective value as a localsource of lime ^nd possibly of cement. In places it is somewhat hardand tough, and is almost as resistant to drilling and blasting as is theBas Obispo formation.

Text Appearing After Image:

GENERAL GEOLOGY OF CANAL ZONE. 25 CAIMITO FORMATION. The Caimito formation, which overhes the Emperador hmestone,consists of three members, as follows: (a) A basal light-gray, soft,argillaceous, or clayhke, sandstone, which grades upward into a yellow-ish argillitic sandstone that is bluish gray on fresh fracture; (h) apeculiarly calcareous conglomerate with some fragments of muchdecayed basic rock, which locally give a bright-green stain to smallpatches of the formation; (c) a light-colored to yellowish argillaceoussandstone fairly w^ell bedded. The upper argilUtic sandstone is therock that outcrops in theChagi-es River atBarbacoas, near San Pablo.Beds a, h and c may be seen in the section at Bald Hill, north of Mira-flores. Bed h outcrops extensively at San Pablo and near the siteof the proposed wireless telegraph station opposite San Pablo. Theformation does not outcrop at all in the Culebra Cut. These rocksare relatively easy to drill and blast, and the weathered product fromthe m

bulletin by united states bureau of mines 1910 book illustrations engineering mines and mineral resources geology high resolution images from internet archive

1910

University of Toronto

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