Timing and controls on late Quaternary landscape development along the eastern Sierra El Mayor range front in northern Baja California, Mexico

Beryllium-10 terrestrial cosmogenic nuclide surface exposure dating of Quaternary landforms in Death Valley

“…Armstrong et al (2010) showed similar problems for piedmont mountain front deposits along the eastern Sierra El Mayor in northern Baja California. Despite the potential problems of using TCN dating of surface cobble and boulders to define ages on alluvial fan surfaces in Death Valley, a combination of TCN surface and depth-profile methods, along with other Quaternary dating techniques, such as OSL geochronology, may provide useful determinations of landform age to investigate tectonic rates and other processes in this region (e.g., Frankel et al, 2007aFrankel et al, , 2010a.…”

A Crustal Velocity Model for the Southern Mexicali Valley, Baja California, Mexico

“…In this limit, separation of the Baja California peninsula from the continental North America plate occurs and continues to the northwest through the right-lateral movement ( Fig. 1 inset) of the San Andreas fault system (Axen and Fletcher, 1998;Suárez-Vidal et al, 2007;Plattner et al, 2007;Suárez-Vidal et al, 2008;Armstrong, 2010;Wei et al, 2011;Oskin et al, 2012). Within our study area ( Fig.…”

The linkages among hillslope-vegetation changes, elevation, and the timing of late-Quaternary fluvial-system aggradation in the Mojave Desert revisited

“…The PVCH purportedly fails in two sites considered by Antinao and McDonald (2013a), i.e., the western side of the Providence Mountains (dated by Clarke, 1994) and the Sierra El Mayor piedmont of Baja California deposits (dated by Spelz et al, 2008;Armstrong et al, 2010). The Baja California sites are not part of the Mojave Desert but are important to address here because, according to Antinao and McDonald (2013a), they provide a basis for a reduced relevance of PVCH in the late-Quaternary evolution of the southwestern US.…”

“…Similarly, fan deposits on the eastern piedmont of Sierra El Mayor dated by Armstrong et al (2010) are potentially problematic for the purposes of testing the PVCH because they were deposited atop, and shortly following deposition of, fluvial and deltaic sediments of the Colorado River (Armstrong et al, 2010), which today is located less than 1 km from the dated fan deposits. As such, aggradation of the Colorado River may have resulted in a local increase in base level, triggering aggradation of fan sediments without a climatically driven change in upstream sediment supply.…”