In september, 1949, while in west central Nevada for the purpose of collecting vegetal materials from the lowermost cultural levels of Lovelock cave (Loud and Harrington, 1929) to be used for radiocarbon dating, the author revisited an open rockshelter site some six miles up the valley from Lovelock cave. The site, since named Leonard rockshelter (site 26- Pe-14) after Zenas Leonard who in 1833 traversed the Humbolt Sink area as a member of the Walker expedition (Leonard, 1904), is not referred to by Loud and Harrington. It is the same site from which, in 1936, Thomas Derby mined bat guano and recovered artifacts described in a brief article (Heizer, 1938). The bat guano formed a layer two to three feet thick lying on ancient gravels of Lake Lahontan and beneath a thick accumulation of aeolian dust and rockfall.