POTREROPAMPA AND LISAHUACHO OBSIDIAN SOURCES: GEOLOGICAL ORIGINS OF ANDAHUAYLAS A AND B TYPE OBSIDIANS IN THE PROVINCE OF AYMARAES, DEPARTMENT OF APURIMAC, PERU

Abstract

In earlier studies, the chemical types of obsidian Andahuaylas A and Andahuaylas B were identified from artifacts recovered at Waywaka and other sites in the Department of Apurimac and adjacent areas. This article reports the discovery of the geological sources of Andahuaylas A and Andahuaylas B in the zones of Potreropampa and Lisahuacho, respectively, and provides instrumental neutron activation analyses of the source samples to demonstrate the identification. The Potreropampa source and the Lisahuacho source are located along a tributary of the Pachachaca River to the southwest of the town of Chalhuanca in the Department of Apurimac. The evidence available suggests that these two sources were primarily of local and regional importance, although small quantities of obsidian from these sources were distributed more widely during the Early Horizon, Middle Horizon, and Late Horizon.

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