Location: Valley of the Rio Jemez, near Jemez Springs, NM
Merckslides catalogue number: 06-16967
Comments: This was a stop on our GEO660 tour of the Valles Caldera and its environs. The rock consists of dense pyroclasts and formed when hot, sticky volcanic ash filled a small rivine. Subsequently, the walls of the rivine eroded away, leaving the rock as its mold.
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