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TROUT CREEK

LINKAGE BETWEEN FLUVIAL SHEET SANDS AND THEIR TIME-EQUIVALENT SHORELINE AND SHELF SANDS (U. CRETACEOUS, WYOMING). TROUT CREEK. FLUVIAL-COASTAL PLAIN-SHORELINE-SHELF TRANSITS. TECTONIC SETTING. THE STRATIGRAPHIC UNITS AND THE MARINE-FLUVIAL CORRELATION. 20-Mile.

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TROUT CREEK

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  1. LINKAGE BETWEEN FLUVIAL SHEET SANDS AND THEIR TIME-EQUIVALENT SHORELINE AND SHELF SANDS (U. CRETACEOUS, WYOMING).

  2. TROUT CREEK FLUVIAL-COASTAL PLAIN-SHORELINE-SHELF TRANSITS

  3. TECTONIC SETTING

  4. THE STRATIGRAPHIC UNITS AND THE MARINE-FLUVIAL CORRELATION 20-Mile Trout Creek 13 9 3 3

  5. LOOKING AT THE LINKAGE BETWEEN SHORELINES AND UPDIP, TIME-EQUIVALENT FLUVIAL SUCCESSIONS

  6. A conceptual sidestep:Sequence stratigraphy of regressive-to-transgressive shoreline tongues Forced regression involved because of great progradational distance

  7. Lets look at the middle reaches of linked system: the shorelines Tens of regressive-to-transgressive migrations (with up to 100 km transits) of the shorelines

  8. ILES, TROUT CREEK & 20-MILE SHORELINES AT DISTAL END OF TRANSECT Trout Creek 20-Mile Iles Mancos Sands Mancos Shale

  9. 20-MILE TROUT CREEK ILES MODIFIED FROM MASTERS 1966

  10. Expression at the updip reaches of the linked system • Amalgamated fluvial successions, but with clusters of unconformities and repeated brackish-water (estuarine) influence

  11. MARTINSEN ET AL. 1999

  12. Trail Member, Ericson Formation near Rock Springs, WY Trail Mb. 10 m Rock Springs Fm.

  13. Expression at the regressive maximum of the linked system • Development of lowstand deltas • Change of dynamic regime to tidal domination

  14. KEY QUESTIONS • Can the largest shoreline progradations (Iles 3, Iles 9, Trout Creek, 20-Mile) be related to recognizable unconformities in the updip region? • Are the numerous transgressive-regressive shoreline transits of the Iles (16 of them) reflected in the Ericson ‘fluvial’ succession? • Is the steep shoreline trajectory of the Iles (aggradational) reflected in the character of the Trail-Rusty members of the Ericson?

  15. QUESTION 1: Are there by-pass, erosion surfaces in the updip fluvial succession that are equivalent to the big downdip shoreline progradation pulses? TWENTY-MILE u/c? CANYON CREEK TROUT CREEK u/c? RUSTY TRAIL ILES 9 u/c ? ILES 3 u/c? GR log

  16. TWENTY-MILE SANDSTONE Incised valley Shoreline

  17. QUESTION 2: ARE THE NUMEROUS REGRESSIVE-TO-TRANSGRESSIVE TRANSITS OF THE DOWNDIP SHORELINES REFLECTED IN THE UPDIP FLUVIAL SUCCESSION?

  18. THE REGRESSIVE-TO-TRANSGRESSIVE TRANSITS OF THE DOWNDIP SHORELINES ARE EXPRESSED IN THE UPDIP AREAS BY FLUVIAL-ESTUARINE ALTERNATIONS FLUVIAL ESTUARINE

  19. estuarine SB fluvial NUMEROUS BRACKISH-WATER INCURSIONS

  20. IHS - inclined heterolithic strata FLUVIAL CHANNELS IIHSI on lower coastal plain/ estuary SB Skolithos • Trace Fossils: • Teichichnus • Skolithos • Planolites • Teredolites

  21. ILES QUESTION 3: Overall shoreline trajectory for lles is steep (it contrasts with the Trout Creek and 20-Mile trajectories). Why is this trajectory steep, & can we recognize this aggradational pattern in the updip fluvial succession ?

  22. UPDIP FLUVIAL ARCHITECTURE & UNCONFORMITIES : AGGRADATIONAL STACKING OF HIGH-FREQUENCY R/T SEQUENCES ILES 9 ? ILES 3 ?

  23. SHELF SANDS AT THE REGRESSIVE MAXIMA: PROBABLY LOWSTAND DELTAS DEVELOPED DURING HIGH SEDIMENT SUPPLY AT THE R/T TURNAROUND

  24. LOWSTAND DELTAS

  25. TST HST FRST LST CONCLUSIONS: 1. Basic building block for the alluvial-coastalplain-shoreline-shelf succession is shown 2. Rate changes required only at the sequence boundary (SB) and at the MFS

  26. Thank you for your attention

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