Extended reconnaissance over 700 square miles of the Pahranagat, Alamo and Hiko Ranges has revealed that more or less continuous emission of fissure type nuees ardentes has been punctuated by periods of fluvio-lacustrine deposition of reworked volcanic ejecta. Use of the exceptional value of ignimbrites as stratigraphic-structural datum planes, and the presence of fresh water limestones and water-laid tuffs, demonstrate that the nuees were extruded over deformed Paleozoic rocks during Oligocene-Miocene time under conditions of gentle topography and at least greater humidity than exists today. Furthermore, the volcanic rocks themselves were extensively faulted as part of the formation of the Basin and Range structures.
| Identifer | oai:union.ndltd.org:RICE/oai:scholarship.rice.edu:1911/18243 |
| Date | January 1960 |
| Creators | Dolgoff, Abraham |
| Source Sets | Rice University |
| Language | English |
| Detected Language | English |
| Type | Thesis, Text |
| Format | application/pdf |
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