Sibley sights: Lapilli tuff

Sibley Volcanic Regional Preserve is the site of a small volcanic center that was last active about 10 million years ago. After it fizzled out, the whole thing was gradually buried in younger sediment. Within the last few million years, the action of the Hayward fault squeezed, folded and uplifted this sequence of rocks and…

Sublacustrine hydrothermal seeps and silicification of microbial

USGS Volcanoes

Accretionary Lapilli Tuff - Geology Superstore

Sibley sights: Lapilli tuff

ALEX STREKEISEN

Thin-section photomicrographs showing the petrographical features

USGS Volcanoes

September, 2017

Eden By The Bay: Sibley Volcanic Regional Preserve

ALEX STREKEISEN

Compressional-wave seismic velocity, bulk density, and their

September, 2017

Microcrystalline dolomite in a middle Permian volcanic lake