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over at least the past 30 million years and is also responsible for activities in the Lassen volcanic area. Between 2 and 4 million years ago, volcanic-derived mud flows called
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streamed down several major mountains that included nearby but now extinct Mount Yana and Mount Maidu to become the Tuscan
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and the 1914 to 1921 eruption of Lassen Peak. The only activity since then has been the constant bubbling of
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formation have persisted into modern times. Most notable of these is the 18th century formation of
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presents a record of sedimentation and volcanic activity in the area in and around
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50:. The park is located in the southernmost part of the
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132:geothermal areas in Lassen Volcanic National Park
18:Knowledge (XXG):Today's featured article
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39:geology of the Lassen volcanic area
31:Lassen Peak as seen from Lake Helen
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44:Lassen Volcanic National Park
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78:plates has fed scores of
153:Tuck School of Business
66:have plunged below the
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114:lava flows along with
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68:North American Plate
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48:Northern California
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130:from the various
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120:Cinder Cone
116:cinder cone
106:eruptions,
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84:California
76:subducting
62:. Oceanic
128:fumaroles
80:volcanoes
168:By email
124:mud pots
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