See more from this Division: Topical Sessions
See more from this Session: Mixed Siliciclastic-Carbonate Systems: Mixing through Time and Space
Abstract:
Previous studies of the Middle Jurassic Ellis Group of Wyoming and Montana have ascribed its stratal geometries and depositional facies to the influence of tectonic movement, sea-level change, and incipient topography. Modeling indicates that the Ellis Group was deposited during two transgressive-regressive segments. Transgressive episodes were dominated by carbonate and evaporite deposition related to changing ocean chemistry and increasing accommodation space. Regressive periods are distinguished by progradational supratidal redbeds. Modeling confirms that the depositional cycles in the lower Ellis Group developed due the interplay between sea-level change and tectonic subsidence related to the evolution of a retro-arc foreland basin. Modeling strongly supports the interpretation that localized syndepositional tectonic movements complicated depositional and erosional patterns.
See more from this Division: Topical Sessions
See more from this Session: Mixed Siliciclastic-Carbonate Systems: Mixing through Time and Space