The lowest elevation site in Block 1 is "Molinos 2" [A03-580], at 4216 masl. It is located below a large breccia boulder that came to rest on a terrace on the south bank of Quebrada de los Molinos. The site is located along the principal trail that climbs up Molinos from the town of Chivay. The north side of the boulder serves as a small rock shelter with the following dimensions: width 5.5m, depth 2.1m, height 0.8m. The site has been bisected by a stream that has become heavily incised from torrential runoff events, perhaps most recently from the El Niño - Southern Oscillation of 1997-1998. The effect of this runoff on the archaeological site is twofold. First, the rock shelter has been filled in with debris, as is visible in Figure 6-9a, and the overall dimensions of the rock shelter have been greatly reduced as it was probably higher and perhaps deeper prior to the infilling. Second, the downcutting of the stream has revealed hundreds of flakes of obsidian and chert in profile in the terrace below (Figure 6-9b).

(a) (b)

Figure 6-9. (a) Small rock shelter at "Molinos 2" [A03-580] is filled with debris from heavy runoff. (b) A density of flakes, predominantly of obsidian, are found in profile in the flood channel.

This site appears to have represented a regular travel stop between the obsidian source and the main Colca valley below. Projectile point evidence from the Early and Middle Archaic are relatively scarce elsewhere in the lower elevation portions of the survey, although 7% of the projectile points recovered during the Block 3 (Callalli) survey were characterized as Early and Middle Archaic. Steven Wernke's (2003: 541-542) survey in the main Colca valley found evidence of Early and Middle Archaic occupation at twelve sites in the form of diagnostic projectile points, and only one site (YA66) was below an altitude of 4000 masl.