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- W4328004604 abstract "The Chama Basin is a shallow basinal structure closely related to the San Juan Basin to the northwest and lying between the Rio Grande trough to the east and the northward extension of the Nacimiento uplift to the west. Late Paleozoic and Mesozoic sediments fill the southeastern part of the basin and Tertiary and Quaternary volcanic rocks and sediments overlap the older beds from the northeast and south. The southeastern part of the basin is characterized by broad open folds, and gentle regional dips to the north and west; steep normal faults with a north to northeast trend are prominent, and exhibit stratigraphic throws of 200 feet or more. Some of the faults in the extreme southeastern portion of the area have been filled by basalt. The basin was filled with marine Pennsylvanian rocks and nonmarine Permian rocks with scarcely any hiatus; the alternating marine and nonmarine environment continued throughout the Mesozoic, culminating in the extensive marine invasion of the upper Cretaceous Mancos sea. During Tertiary time widespread volcanism to the north, east, and south covered much of the area with tuffaceous debris, gravel fans, and lava. Glaciation was extensive during the Pleistocene in the northern part of the Chama Basin, but no glacial deposits can be identified in the southeastern part. However, solifluction and landsliding probably became pronounced under the periglacial conditions of the Pleistocene, and continued post-glacial erosion has developed the numerous terraces and alluvial fills found in the larger valleys. Ranching and farming are the principal economic resources of the southeastern part of the Chama Basin. A paucity of water has hampered development. Sparse showings of uranium were staked, but no production has been developed. Two wells have been drilled in the southeastern part of the basin but no shows of oil or gas were encountered." @default.
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- W4328004604 date "1962-01-01" @default.
- W4328004604 modified "2023-10-17" @default.
- W4328004604 title "Geology of the southeastern part of the Chama basin" @default.
- W4328004604 doi "https://doi.org/10.58799/b-75" @default.
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