Eocene-Pliocene stratigraphy along the southern margin of the Wind River Range, Wyoming: revisions and implications from field and fission-track studies

Journal Article · Wed Jan 01 00:00:00 EST 1986 · Mt. Geol.; (United States)

OSTI ID:5599769

Steidtmann, J R; Middleton, L T

The established mid-Tertiary stratigraphy along the southern margin of the Wind River Range is of questionable chronologic validity because of the difficulty in discriminating among the several tuffaceous units and because lithologic criteria have been used as chronostratigraphic indicators. Field observations and zircon fission-track ages suggest certain revisions of, and additions to, this stratigraphy. These include: (1) recognition of the Cathedral Bluffs Tongue of the Wasatch Formation at Reds Cabin monocline, (2) establishment of a late Oligocene or early Miocene age for the South Pass Formation and (3) recognition that there are middle Miocene deposits previously mapped as Arikaree that consist of reworked Arikaree shed off the upthrown side of the Continental fault. The implications of these findings are that the Continental fault, now a collapse feature, was a tear fault during the early Eocene, that there are most likely Oligocene rocks north of the Continental fault, that there was late Oligocene or early Miocene uplift in the core of the Wind River Range and that the range collapsed in the middle Miocene.

• Research Organization: Univ. of Wyoming, Laramie
• OSTI ID: 5599769
• Journal Information: Mt. Geol.; (United States), Vol. 23:1
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
GEOLOGIC DEPOSITS
AGE ESTIMATION
STRATIGRAPHY
WYOMING
FISSION TRACKS
GEOLOGIC AGES
GEOLOGIC FAULTS
GEOLOGIC HISTORY
GREEN RIVER FORMATION
SEDIMENTARY ROCKS
WASATCH FORMATION
ZIRCON
FEDERAL REGION VIII
GEOLOGIC FORMATIONS
GEOLOGIC FRACTURES
GEOLOGIC STRUCTURES
GEOLOGY
MINERALS
NORTH AMERICA
OXYGEN COMPOUNDS
PARTICLE TRACKS
ROCKS
SILICATE MINERALS
SILICATES
SILICON COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
USA
ZIRCONIUM COMPOUNDS
ZIRCONIUM SILICATES
580100* - Geology & Hydrology- (-1989)