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…

September, 2017

Igneous Accretionary Lapilli Tuff ID'd (Ohanapecosh)

Back scattered electron photomicrograph of a carbonate lapillus in

ALEX STREKEISEN

The Rocks of Leona Quarry

Polished block of Murumuli tuff (MUR003) showing the abundant rock

ALEX STREKEISEN

ALEX STREKEISEN

Field Trip Report: Sibley Volcanic Regional Preserve – Northern

Compressional-wave seismic velocity, bulk density, and their

Compressional-wave seismic velocity, bulk density, and their

Andrew Alden, Oakland Geology