Cretaceous/Paleogene (K/Pg) and high Cenozoic Flood boundary proponents both point to the Laramide Province (southern Montana, Wyoming, Colorado, and northern New Mexico) as key evidence for their interpretations. This research program aims to bridge gaps between these positions, promoting clearer understanding, improved future research, and greater unity.
The Laramide Province comprises 20 sedimentary basins and many intervening uplifts generated by the Laramide Orogeny. This program applies a multidisciplinary approach, integrating structural geology, tectonics, stratigraphy, sedimentology, petrology, geomorphology, glaciology, pedology, geochronology, hydrology (modern and paleo-watersheds), climatology, paleoclimatology, paleontology, biostratigraphy, and paleoecology. A primary goal is to develop a correlated timeline across these disciplines.
The research team defines the Flood lithostratigraphically rather than chronostratigraphically, identifying Flood-related deposits by sediment-laden emplacement or erosional features associated with its recessional phase.
Cenozoic formations (Paleocene through Pleistocene) within Wyoming basins record a complex tectonic, depositional, and erosional history. In many basins, 1–4 km (0.6–2.5 miles) of sediment has been removed. Interpreted within a 5,000–10,000-year framework, this implies significant erosion since Flood recession.
Estimated erosion rates are evaluated across climatic intervals, including flood recessional (sheet and channelized flow), post-flood, glacial, post-glacial, and modern conditions. These analyses provide a framework for reconstructing basin-scale erosional histories and refining interpretations of upper Flood boundaries.