Geologic and hydrogeologic characteristics of the White River Formation, Lance Formation, and Fox Hills Sandstone, northern greater Denver Basin, southeastern Laramie County, Wyoming

Abstract

assisted with the identification of a fossil jawbone recovered from collected core.Numerous current and former U.S. Geological Survey colleagues assisted with various aspects of this study. Cheryl Eddy-Miller and Scott Edmiston installed the instrumentation used to continuously measure groundwater levels in three monitoring wells installed for this study. Cheryl Eddy-Miller, Greg Boughton, Peter Wright, and Scott Edmiston assisted with groundwater-quality sampling. Greg Stanton and Jonathan Thomas completed the borehole geophysical surveys. Colleague reviews of the full report by Janet Carter and Kent Becher and of parts of the report section "Response of Groundwater Levels to Atmospheric Loading and Earth Tides" by Fred Day-Lewis and Paul Hsieh improved the quality of the report. Suzanne Roberts created the illustrations.

Stable Isotope Record of Triceratops from a Mass Accumulation (Lance Formation, Wyoming, USA) Provides Insights into Triceratops Behaviour and Ecology

“…The DTB is a monospecific multi-generational mass death assemblage discovered in western Wyoming, USA on the south-eastern flank of the Powder River Basin (43 • 36 ′ 26.1"N, 104 • 23 ′ 29.3"W; Kaskes et al, 2016). The bonebed is part of the Upper Maastrichtian terrestrial Lance Formation (Bartos et al, 2021) and is dated at ~67 Ma, based on its stratigraphic proximity to the underlying Fox Hills Formation. Five Triceratops individuals are identified as Triceratops horridus based on the recovered diagnostic cranial elements (Bastiaans et al, 2016) and relatively lower stratigraphic position in the Lance Formation (Longrich and Field, 2012;Scannella et al, 2014).…”