Abstract by Austin Bertoch
Statistical Analysis of Complex Stacking Patterns of the Trail Member Fluvial Sandstones, Ericson Sandstone, Mesaverde Group
The Trail Member of the Cretaceous Ericson Sandstone, exposed along the length of the Rock Springs Uplift, represents a low-accommodation fluvial system. It is dominated by trough-cross stratified sandstone with frequent, but often discontinuous, mud and silt interlayers. Though this strata is overwhelmingly sand-rich in the study area, measured sections and photogrammetric modeling of this fluvial system show both spatial and temporal variations in the character and connectivity of these sands that have important implications in this and analogous systems in the subsurface. Near the top of the section in the field area, sands are more laterally accreting and less vertically stacked, suggesting that accommodation was lowest at this time, leading to frequent avulsion and lateral migration of channels. In the middle of the stratigraphic section, sands are generally less laterally extensive, and multi-story channel complexes are more common. It is in this section of the outcrop that cluster statistics were implemented to better understand the pattern of vertical stacking of channels.