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Showing 1 to 9 of 9 for “"Geology -- Oregon"”.
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Geology and Petroleum Potential of the Hay Creek Anticline, North-Central Oregon
<p>For many years it has been reported that the core of the Hay Creek Anticline exposes metamorphic rocks of Paleozoic or Mesozoic age. On closer study it was found that these rocks consist of only slightly metamorphosed black to dark grey siltstones and sandstones with less abundant chert pebble …
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Paleocurrent Analysis of the Cretaceous Mitchell Formation, North-Central Oregon
<p>Cretaceous sedimentary rocks of north-central Oregon previously referred to as the Hudspeth and Gable Creek formations and recently renamed the Mitchell Formation are potential petroleum source and reservoir rocks. Thus, determining their extent under the cover of Tertiary volcanics is of great …
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Geology in the Vicinity of the City of Fossil, Wheeler County, North-Central Oregon
… Blue Mountains Anticlinorium in north-central Oregon. The primary geologic problems investigated were: 1) the age and stratigraphic position of leaf-bearing tufts mapped as Oligo-Miocene John Day Formation but surrounded by andesitic basalts of the Eo-Oligocene Clarno Formation, 2) the age of …
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Potential Petroleum Reservoir Rocks of North-Central Oregon
… rock, that regions such as northcentral Oregon do not hold potential as petroleum basins. The typical argument has been that volcanic flows have no effective porosity or permeability and poorly sorted volcaniclastic sediments contain a high percentage of mineralogically unstable grains …