FACIES ARCHITECTURE AND TIME STRATIGRAPHIC RELATIONSHIPS OF A CONFINED TRUNKTRIBUTARY VALLEY FILL AND UNCONFINED FLUVIAL SYSTEM IN THE BACKWATER OF THE TURONIAN FERRON-NOTOM DELTA, UTAH, USA

摘要

This paper documents a tidally incised, mudstone-prone tributary valley fill linked to a trunk valley in the backwater limit of the Turonian Notom Delta of the Ferron Sandstone Member, Utah. High-resolution 3D photogrammetry models were used to correlate a 20-m-deep valley between 32 measured sections over a 1 km(2) area. A GPS survey and GIS geostatistical tools were used to restore the morphology of the tributary valley. The restored valley floor is interpreted as a surface of tidal erosion, based on the overlying facies and surface morphology. Morphological similarities exist between this tributary valley and modern analogs observed in northern Australia, the Memramcook tributary in the Bay of Fundy, and Pleistocene sediments in the Gulf of Thailand.