. Brigham Young University science bulletin. Biology -- Periodicals. MlRIDAE OF THE NEVADA TEST SlTE Nuclear Medicine and Radiation Biology, Los Angeles, California. I wish to thank the authorities of the Illinois Natural History Survey for permission to repro- duce many figures used in the publication, "Mi- ridae of Illinois" (Knight, 1941), Bulletin Vol. 22, Art. 1. I have used Figures 22-69 by the author, and Figures 87, 89-96, 100, 101, 103, 105, 108, 109, 110, 113, 127, 137, 141, 142, 144, 145, 151, , 156, 158, 160, 169 and 172 drawn by the artist C. O. Mohr. The following a
. Brigham Young University science bulletin. Biology -- Periodicals. MlRIDAE OF THE NEVADA TEST SlTE Nuclear Medicine and Radiation Biology, Los Angeles, California. I wish to thank the authorities of the Illinois Natural History Survey for permission to repro- duce many figures used in the publication, "Mi- ridae of Illinois" (Knight, 1941), Bulletin Vol. 22, Art. 1. I have used Figures 22-69 by the author, and Figures 87, 89-96, 100, 101, 103, 105, 108, 109, 110, 113, 127, 137, 141, 142, 144, 145, 151, , 156, 158, 160, 169 and 172 drawn by the artist C. O. Mohr. The following account and pictures of the physiographic and biotic features of the test site were prepared by Dr. D Elden Beck. PHYSIOGRAPHIC AND BIOTIC FEATURES Figure 1 shows the location of the Nevada Test Site with reference to contiguous states and other well-known political subdivisions. The overall size varies from time to time as the needs of the federal government and its several agen- cies decree. Under any circumstances it amounts to several thousand square miles. For purposes of this report the map as Figure 2 shows the general boundary limits. This study was con- fined to these boundaries for data gathered at the Nevada Test Site. The Atomic Energy Com- mission uses the site as a proving ground. The main entry to the site is at Mercury, Nevada, about 70 miles northwest of Las Vegas alone; Highway US 95, the main route between Las Vegas and Tonopah, Nevada. There are three rather distinctive physio- graphic features characteristic of the Nevada Test Site. The eastern third of the area is char- acterized by closed valleys lying between low, rugged mountains on the east and hills, moun- tains, and mesas on the west. Two playas, Yucca and Frenchman, are centrally located, with Groom Lake in the northeast corner of the site. Extensive flood plains extend their fan-shaped deposits where they issue from the mountains and mesas, coursing their way to the closed-in valleys below (Figures
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