| This relative-dating study of the Pleistocene moraines in the southwest Tahoe basin distinguishes two ages of moraines and provides detailed description and mapping of the Tahoe moraines of Blackwelder (1931). Tioga moraines have relatively narrow crests (3--8 m, avg. 5 m), steep flanks (21--31°, avg. 27°), high boulder frequency (90--166, avg. 121), shallow weathering pans (11--163 mm, avg. 34 mm), and low relief of mafic inclusions (5--55 mm, avg. 26 mm). Tahoe moraines have relatively wide crests (5--24 m, avg. 16 m), less steep flanks (15--32°, avg. 22°), low boulder frequency (8--98, avg. 34), deep weathering pans (0--700 mm, avg. 118 mm), and high relief of mafic inclusions (15--150 mm, avg. 53 mm). ELAs estimated by THAR for small cirque glaciers at Granite and Angora Lakes are ∼2410 m for Tioga glaciers and ∼2400 m for Tahoe glaciers. Distinct fault scarps offset Tioga moraines at Cascade Lake and Osgood Swamp. |
