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.

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Antropologia e Historia (1). Recently instituted commercial quarrying of the lava flow (pedregal) which overlies the archeological deposits disclosed several earth mounds. These were recognized as of archeological significance by Eric Wolf and Angel Palerm in 1956 (2).By January 1957, the sloping sides of four small earth mounds had been partially exposed by clearing off the superjacent basalt in quarrying operations. In each case the lava flow had not completely covered the top of the mounds, which anciently formed obstructions to the flow. One edge and the center of each mound was available for excavation, and testing of three of the mounds was carried out. Each mound proved to contain a structure, either of clay or earth, with a basalt boulder facing, as well as graves, an abundance of potsherds, and minor artifacts. The mounds thus far located in the quarry area lying on the west side of Insurgentes Boulevard have been grouped by us as a separate subzone of Cuicuilco, and will be referred to as Cuicuilco-B in order to distinguish it from the Cuicuilco Pyramid itself (lying about 0.3 mile to the east) which was the scene of Cummings' investigation.That Cuicuilco-B is contemporaneous with and associated with the round, terraced, boulder-faced Cuicuilco Pyramid