1. Education
You can opt-out at any time. Please refer to our privacy policy for contact information.


Volcanic Rock Used for Prehistoric Stone Tools


Northern California Dacite

Northern California Dacite, created around the time of the 1915 eruption of Mt. Lassen.

Rudi Riet

Dacite is a very fine-grained raw stone material created by volcanic action, and used by flint-knappers in the northern Rio Grande valley of New Mexico and southern Colorado. Initially identified by archaeologists as 'basalt', this volcanic stone is more fine-grained than basalt, and knaps easily.

Dacite found in prehistoric contexts in the Rio Grande such as Pot Creek Pueblo have been identified by chemical analysis and identification of trace elements as having come from several locations in the Taos Plateau Volcanic field, including Newman Dome and the San Antonio Mountain; and the Cerros del Rio chill zone, both areas in northern New Mexico.


This glossary entry is a part of the About.com guide to Northwest Coast, and the Dictionary of Archaeology.

Barnard H, Dooley AN, Areshian G, Gasparyan B, and Faull KF. 2011. Chemical evidence for wine production around 4000 BCE in the Late Chalcolithic Near Eastern highlands. Journal of Archaeological Science 38(5):977-984.

©2014 About.com. All rights reserved.