... only from mid-Pleistocene time. Widespread occurrence of lower Pleistocene braided channel deposits east of the Chadron–Cambridge Arch that contain Laramie Range–derived anorthosite indicates repeated channel switching and meandering during times of aggradation over surfaces of minimal relief...

... sandstones of the Denver basin. More exploratory drilling was directed toward the pre-Cretaceous objectives along the Chadron-Cambridge arch, Denver basin, and Las Animas arch-western Dodge City basin; Pennsylvanian discoveries on the Las Animas arch and a Lyons sandstone (Permian) discovery of the west...

...E. C. Reed ABSTRACT The Central Nebraska basin comprises an area of more than 25,000 square miles bounded on the west by the Chadron-Cambridge arch, on the east by the Table Rock-Nehawka-Richfield arch, on the north by the Sioux uplift, and on the south by the Kansas-Nebraska line. For all...

... supporting data, however, suggest current tectonic activity on the Chadron-Cambridge Arch. The recently installed eight-station Sleepy Hollow Seismic Network should provide the data necessary to test these hypotheses. 17 3 1983 Copyright © 1983, by the Seismological Society of America...

...Vinton A. Moore; Robert B. Nelson Abstract The Cambridge arch and the Chadron arch are parts of a structural system which crosses Nebraska in a northwesterly direction. Computer-plotted data on the Paleozoic-Mesozoic sequence indicate that variations in the stratigraphic thickness of individual...

... important dry exploratory tests were drilled along or adjacent to the Chadron-Cambridge arch during 1964. These are summarized in Table III (14, 15, 16, and 17). Significant 1964 exploratory and development activities in eastern and northwestern Colorado and western Nebraska are summarized...

...-Cambrian in age. That is, it is a feature of intrastate size on a trend of interstate length, which is described by the alignment of: the Black Hills, South Dakota; Chadron and Cambridge arches, Nebraska; Central Kansas uplift, and perhaps additional extensions on both ends. Just as these intermediate...

.... The Black Hills are the culmination of the long north-northwest-trending basement high that includes the Chadron and Cambridge arches of Nebraska and the Central Kansas uplift. Most wells to basement have penetrated metamorphic rocks along this uplift. A granite batholith underlies the area along...

... geologic features are the Piceance and Sand Wash basins, which are separated by the Uinta and White River uplifts of northwestern Colorado, and the Denver basin, bounded by the Chadron-Cambridge arch, Las Animas arch, Apishapa uplift, and the Front Range. Fig. 1. Production to date is from rocks...

..., were failures. Pre-Cretaceous tests continued to be drilled on the crest and flanks of the Chadron-Cambridge arch, supplying stratigraphic and structural information of regional importance. This search was a continuance of an exploratory trend established in 1952. Deep exploratory tests...

..., and the remaining 18% were scattered throughout the western part of the state. The trend of exploration activity was west of the area of early development. Six basement tests were drilled in the vicinity of the Chadron-Cambridge arch without success. An additional pre-Cambrian test in Sioux County (118...

... encompasses most of the Williston basin, the northeastern part of the Denver basin, and the several uplifts that separate these 2 basins, including the Cambridge and Chadron arches, the Black Hills uplift, and the Sioux ridge. This report has 2 main objectives: (1) to synthesize the regional setting...

.... (1985) . Gulf of Mexico arches : JA , Jackson dome; MD , Monroe dome; SA , Sabine arch; and SM , San Marcos arch. Southern High Plains arches : BS , Big Springs structure; BU , Bourbon uplift; CA , Cambridge arch; CH , Chadron arch; CK , central Kansas uplift; LA , Las Animas arch; NE...

...). The Nebraska development paper, for the first time, is reported as one unit. Table 3 , which summarizes drilling activity, has the tabulation divided into 3 geographic areas. The western, or Denver-Julesburg basin area, includes counties west of the Chadron-Cambridge arch. The central area includes...

...C. A. Martin, Jr. ABSTRACT There were 100 fewer tests drilled in Colorado and western Nebraska in 1963 than in 1962. This was a decline of 8.8%. The over-all success ratio, however, remained nearly constant, increasing by 0.3% to 29.6%. Exploratory drilling in the Cambridge Arch area of Nebraska...

... in the Ferron pay sandstones. In Nebraska, pre-Cretaceous tests were drilled on the crest and flanks of the Chadron-Cambridge arch continuing an exploratory trend established in 1952. The stratigraphy and structure of this area are still poorly known and each well supplied important information...

..., and in the northeastern part along the Chadron arch. The Park areas of Colorado were included in the leasing action. The most pronounced activity was in the North Park Basin as a result of the discovery on the Coalmont anticline. Action later extended into the Middle and South Park basins. While steadily mounting...

... an additional 45 gas wells, 2 of which were new gas discoveries. Nebraska’s 1978 drilling activity decreased 6.8% compared to 1977; 384 wells were completed compared to 412 completions during the previous year. The old established producing areas, the Denver-Julesburg basin, the Chadron-Cambridge arch...