The analysis of the stratigraphy and materials from Three Maries Hill (Cerro Tres Marias), an open air site, allow to demonstrate the existence of short-term camps at the fog-oases (lomas) of the Peruvian central coast, during the Archaic stage (7400–1700 years Cal. BC). The site presents a sequence of superimposed camps, occupied during few days by two to four individuals sheltered under small windbreakers (paravientos), leaving few discard around from the consumption of every local resource capable to sustain them during their short stage: medium- and small-size fog-oasis fauna, plant food carried from the valley, river fishes, and mollusks extracted from sandy beaches of easy access. In this kind of site, they performed the initial processing of the large fauna hunted in the nearby, derivating in the discard (without excluding its consumption) of the skeletal parts economically poor. In the hunting and the processing of the fauna they employed simple lithic artifacts, fabricated with local raw materials extracted from quarries close to the valleys the hunters crossed to reach the fog-oases.