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- W7358465 abstract "The Indio Mountains are located 25 miles south of Van Horn, Texas, on the northwestern margin of the Chihuahua Tectonic Belt. The Indio Mountains are composed of Cretaceous sedimentary rocks deposited on the edge of the Chihuahua trough. The focus of this study, the Yucca conglomerate, is the oldest known Mesozoic rock in the region, although its unconformable base is not exposed within the Indio Mountains. This area has been affected by faulting associated with both the Chihuahua tectonic belt and the Rio Grande Rift. During summer 1992, the authors measured a stratigraphic section through the Yucca conglomerate, using a custom made Jacob's staff. The measured section is over 500 meters thick and was measured and described in 3 meter intervals. The section was measured up a single valley, and did contain some minor faults. This project had three objectives: (1) to examine variations in the sand/conglomerate ratio throughout the Yucca Fm.; (2) to examine variations in conglomerate clast composition using outcrop and thin section analysis; and, (3) ultimately, to compare this stratigraphic section with sections measured by Underwood (1962) in the Eagle Mountains and Devil's Ridge to the northwest. The sand/conglomerate ratio varies, with the proportion of sand increasingmore » up section. At the base of the section, the rocks are mostly clast supported conglomerate interbedded with thin (12 cm) sand layers. The top of the section is dominated by sandstones with pebble stringers, with some massive sand layers over 6m thick. Few truly conglomeratic layers are present near the top of the section. The composition of clasts within the conglomerate also varies. The carbonate clasts are often preferentially eroded. The carbonate content increases up section.« less" @default.
- W7358465 created "2016-06-24" @default.
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- W7358465 date "1993-02-01" @default.
- W7358465 modified "2023-09-26" @default.
- W7358465 title "Stratigraphy of the Yucca Formation, Indio Mountains, west Texas" @default.
- W7358465 hasPublicationYear "1993" @default.
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