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The Geology of Ancon Point, Ecuador, South America

George Sheppard
The Journal of Geology
Vol. 36, No. 2 (Feb. - Mar., 1928), pp. 113-138
Stable URL: http://www.jstor.org/stable/30055672
Page Count: 26
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
The Geology of Ancon Point, Ecuador, South America
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Abstract

A type area of Tertiary sedimentation is described which occurs to the south of the Santa Elena peninsula. Though the discussion is confined to one area, the observations can be applied in general to the Tertiary formations which are found along this part of the coast belt. An attempt is made in the stratigraphical succession to zone certain of the Oligocene and Eocene formations, and a description is included of the lithological types which occur in the series. The presence of igneous dikes and the incorporation of "foreign" volcanic rocks in the Tertiary sedimentation is also discussed, and a general account given of the geological history of the formations. Brief reference is also made to the Quaternary deposits, which occur in the form of raised "terraces," and are locally known as tablazos. Ancon Point itself is a structural outlier of Oligocene beds faulted against the Eocene formations of the mainland. In addition to a description of the local features of structural interest, a general review of the regional tectonics is included.

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