. The Caribbean forester. Forests and forestry Caribbean Area Periodicals; Forests and forestry Tropics Periodicals. Fig. 2.—An island of vegetation on the surface of surface and the curving canals filled with rain water, marginal plants extending into the canals. The bush of Clusia are floating on the surface of the canal and Brighton strata is visible in the background. (Islote pecto bajo y abovedado, cubierto dc canales curvos se extienden hasta dentro de los canales son Blechn siste de Chrysobalanus icaco y Clusia rosea. Las ho) su fondo. En el fondo puede verse uno de los tor Pitch Lcke s
. The Caribbean forester. Forests and forestry Caribbean Area Periodicals; Forests and forestry Tropics Periodicals. Fig. 2.—An island of vegetation on the surface of surface and the curving canals filled with rain water, marginal plants extending into the canals. The bush of Clusia are floating on the surface of the canal and Brighton strata is visible in the background. (Islote pecto bajo y abovedado, cubierto dc canales curvos se extienden hasta dentro de los canales son Blechn siste de Chrysobalanus icaco y Clusia rosea. Las ho) su fondo. En el fondo puede verse uno de los tor Pitch Lcke showing the low, dome-like aspect of the Blechnum indicum and Nepsera aquatica are the cs arc Chrysobalanus icaco and Clusia rosea. Leaves line the bottom. One of the oil rigs on the nearby de vegetacion en la superficie del Lago de Brea, de as- llenos de agua de lluvia. Las plantas nnrginales que um indicum y Nepsera aquatica. El matorral con- as de Clusia f lot an en la superficie del canal y tapizan retes de petroleo en el estrato Brighton ccrcano). Attempts have been made in the past to fill in some of the canals on the lake surface in order to establish roads or to control the flow of water near the area of commercial excavation. Following all of these attempts the materials used for fill have gradually sunk in the canal bed and the identity of all the canals has been preserved. It seems, therefore, that the canals represent weak junctions between the mounds of the pitch. Manross in 1855 described the exudation pf soft pitch from these junctions into the water of the canals. He reported a pro- jection of asphalt forcing itself into the water from the1 bottom of the canal so that a flat-topped column was formed. Frag- ments of the column when broken off sank to the bottom, eliminating the possibility that such columns rose by buoyancy. Similar projections or folds of pitch can be seen in the canals at the present time. It is ap- parent that the association of soft tar and
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Keywords: ., bookcentury1900, bookcollectionameri, bookcollectionbiodiversity
