Eocene wave-dominated deltaic sedimentation, Oregon Coast Range
The Eocene Tyee and Coaledo Formations of southwest Oregon together illustrate vertical and lateral facies changes in delta-front and prodelta-to-shelf deposits, which prograded into a forearc basin. Prevalent coarse sandstone bodies with wood also contain large-scale, contorted cross-bedding; they show north-northwest paleocurrent transport directions. An abundance of hummocky stratification and symmetrical ripples in the prodelta and shelf sandstones indicate the dominance of wavy processes. Wave-dominated deltaic deposition was a repetitive and persisting style of sedimentation throughout much of the Eocene period in southwest Oregon. This scenario is useful for distinguishing vertical and lateral relationships applicable to other ancient wave-dominated systems and to predictions in potentially economic units of the Pacific Northwest.
- Research Organization:
- Univ. of Utah, Salt Lake City
- OSTI ID:
- 6608955
- Report Number(s):
- CONF-8405216-
- Journal Information:
- Am. Assoc. Pet. Geol., Bull.; (United States), Journal Name: Am. Assoc. Pet. Geol., Bull.; (United States) Vol. 68:4; ISSN AAPGB
- Country of Publication:
- United States
- Language:
- English
Similar Records
Shelf and deep-sea sedimentation in Eocene forearc basin, western Oregon-fan or non-fan
Variability of deltaic sedimentation during clastic influx into a carbonate-dominated craton
Related Subjects
020200* -- Petroleum-- Reserves
Geology
& Exploration
03 NATURAL GAS
030200 -- Natural Gas-- Reserves
Geology
& Exploration
CENOZOIC ERA
DEPOSITION
FEDERAL REGION X
GEOLOGIC AGES
GEOLOGIC FORMATIONS
GEOLOGIC STRUCTURES
NORTH AMERICA
OREGON
RESERVOIR ROCK
ROCKS
SANDSTONES
SEDIMENTARY BASINS
SEDIMENTARY ROCKS
SEDIMENTATION
TERTIARY PERIOD
USA