Roy A. Bailey
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View article: California's restless giant: The Long Valley Caldera
California's restless giant: The Long Valley Caldera Open
Scientists have monitored geologic unrest in the Long Valley, California, area since 1980. In that year, following a swarm of strong earthquakes, they discovered that the central part of the Long Valley Caldera had begun actively rising. U…
View article: Invisible CO2 gas killing trees at Mammoth Mountain, California
Invisible CO2 gas killing trees at Mammoth Mountain, California Open
Since 1980, scientists have monitored geologic unrest in Long Valley Caldera and at adjacent Mammoth Mountain, California. After a persistent swarm of earthquakes beneath Mammoth Mountain in 1989, earth scientists discovered that large vol…
View article: Physical geology and eruptive history of the Matahina Ignimbrite, Taupo Volcanic Zone, North Island, New Zealand
Physical geology and eruptive history of the Matahina Ignimbrite, Taupo Volcanic Zone, North Island, New Zealand Open
The Matahina Ignimbrite is a 280 ka ash‐flow sheet that erupted from Haroharo Caldera in the Okataina Volcanic Centre, northern Taupo Volcanic Zone, North Island, New Zealand. The ignimbrite underlies a 2000 km2 area mainly east of the cal…
View article: Stratigraphic nomenclature of volcanic rocks in the Jemez Mountains, New Mexico
Stratigraphic nomenclature of volcanic rocks in the Jemez Mountains, New Mexico Open
Upper Tertiary and Quaternary volcanic rocks of the Jemez Mountains are subdivided into three groups the Keres Group, in the south, the Polvadera Group, mainly in the north, and the Tewa Group, in the central and flanking parts of the moun…
View article: Fusion of arkosic sand by intrusive andesite
Fusion of arkosic sand by intrusive andesite Open
An andesite dike in the Valles Mountains of northern New Mexico has intruded and partly fused arkosic sediments for a distance of 50 feet from its contacts. The dike is semi-circular in form, has a maximum width of about 100 feet, and is a…