In the event of a US Government shutdown, the Global Volcanism Program will remain OPEN through at least Saturday, October 7, by using prior year funds. Visit si.edu for updates.

Logo link to homepage

Global Volcanism Program | Image GVP-07954

The locally widespread Tepic Pumice is exposed in this quarry on the NW outskirts of the city of Tepic.  The zoned rhyodacitic-andesitic pumice, forming the upper half of this exposure, was erupted about 15,000 years ago and resulted in the formation of a 4-km-wide caldera at the summit of San Juan volcano.  The 5.6 cu km Tepic Pumice deposit underlies the city of Tepic, the captial city of Narayit state, to thickness of 2-9 m.   Photo by Jim Luhr, 1976 (Smithsonian Institution).

The locally widespread Tepic Pumice is exposed in this quarry on the NW outskirts of the city of Tepic. The zoned rhyodacitic-andesitic pumice, forming the upper half of this exposure, was erupted about 15,000 years ago and resulted in the formation of a 4-km-wide caldera at the summit of San Juan volcano. The 5.6 cu km Tepic Pumice deposit underlies the city of Tepic, the captial city of Narayit state, to thickness of 2-9 m.

Photo by Jim Luhr, 1976 (Smithsonian Institution).

Creative Commons Icon This image is made available under the Public Domain Dedication CC0 license, but proper attribution is appreciated.


San Juan