SOME COCCIDÆ; FROM THE GRAND CANON, ARIZONA.
نویسندگان
چکیده
منابع مشابه
The pre-Flood/Flood Boundary: As Defined in Grand Canyon, Arizona and eastern Mojave Desert, California
The singular events which occurred at the initiation of the Flood should have produced a geologic signature with at least five characteristics: (a) a mechanical-erosional discontinuity (ED) identified by regional structural analysis—probably the most significant unconformity in any given area; (b) a time or age discontinuity (AD) identified by coarse sediments above the erosional unconformity c...
متن کاملFactors Affecting Condition of Flannelmouth Suckers in the Colorado River, Grand Canyon, Arizona
—The impoundment of the Colorado River by Glen Canyon Dam, Arizona, in 1963 created a highly regulated environment in the Grand Canyon that altered the native fish populations, including the flannelmouth sucker Catostomus latipinnis. Flannelmouth suckers were sampled from 1991 to 2001 to determine seasonal, annual, and spatial trends in fish condition (i.e., relative weight [Wr]). Mean Wr peake...
متن کاملEvidences for Rapid Formation and Failure of Pleistocene “Lava Dams” of the Western Grand Canyon, Arizona
Over two hundred isolated outcrops of horizontally stratified, basaltic lava flows within the inner gorge of western Grand Canyon indicate that several natural “lava dams” blocked the flow of the Colorado River during the Pleistocene, resulting in the formation of several lakes within the canyon. The largest lake was 90 m above the high water level of present-day Lake Powell and backed up a dis...
متن کاملAlgal Deposits of Unkar Proterozoic Age in the Grand Canyon, Arizona.
* Evidence for the second partial reaction going on from left to right has been obtained recently by Millikan and Cameron. As the intensity of the cosmic radiation is of the same order of magnitude as the total intensity of star light, the building up process of matter from simple nuclei seems to go on at the same rate as the burning up of matter in the stars. 1 See, for instance, Jeans, Nature...
متن کاملK-Ar ages of Pleistocene lava dams in the Grand Canyon in Arizona.
At least 13 times during the Pleistocene Epoch lava flowed into the inner gorge of the Grand Canyon and formed lava dams, as high as 600 m, that temporarily blocked the flow of the Colorado River. K-Ar ages on these lava dams indicate that the seven youngest formed within a short period of time between about 0.6 and 0.4 mega-annum (Ma). The physiography of the lava dam remnants within the canyo...
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ژورنال
عنوان ژورنال: The Canadian Entomologist
سال: 1912
ISSN: 0008-347X,1918-3240
DOI: 10.4039/ent44301-10