Tidal Deposits of the Campanian Western Interior Seaway, Wyoming, Utah and Colorado, USA

摘要: The large-scale effects of tidal waves entering the Cretaceous Western Interior Seaway from Gulf Mexico have previously been modeled, but field evidence for tides in Campanian succession has never assembled. Tidal deposits deltaic, estuarine and barrier-lagoon successions along southwestern margin seaway, Utah, Colorado Wyoming are documented. currents dominated distal, subaqueous segments many regressive deltaic transects (setting 1), influence was strong during transgressive backstepping 2) shorelines. Marked setting 2 likely due to increased constriction coastline irregularity after valley incision as well possible resonance with increase shelf width accompanying sea-level rise. In common basinward cross-shelf trend wave- tide-dominated probably resulted amplification sea level fell (albeit few tens meters). seaway narrowed possibly became restricted north lowstand periods, enhancing counter-clockwise, Coriolis-driven current gyre southern half basin. addition, there is notable all 77.5–75 Ma shorelines, irrespective stand. These more embayed shorelines (contrasting straight wave before after) irregular widespread shallowing around embryonic, basement-involved topography, seascape adjusted a slight tilt (as opposed earlier backtilt foreland basin) much irregular, shallow bathymetry Sevier-Laramide transition.