Subjects: FLOOD basalts; MAGMAS; RHYOLITEOREGON; NEVADA
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Subjects: VOLCANIC fields; RHYOLITE; EXPLOSIVE volcanic eruptionsSNAKE River Plain (Idaho & Or.); IDAHO; OREGON
Subjects: VOLCANIC eruptions; MAGMAS; VOLCANIC fieldsNEW Mexico
Subjects: *VOLCANIC fields; *LAVA domes; *GEOLOGICAL time scalesSIERRA Nevada (Calif. & Nev.); CALIFORNIA
Subjects: *PERLITE; *VOLCANIC fields; *GEOLOGYSLOVAKIA
Subjects: MAGMAS; BASALT; INCLUSIONS in igneous rocksCOSO Range (Calif.); BIG Pine Mountain (Calif.); CALIFORNIA
Subjects: RHYOLITE; SILICA; HYDROTHERMAL ventsCALIFORNIA
Subjects: *MAGMAS; *VOLCANIC fields; *GRAVITYCHILE
Subjects: URANIUM-lead dating; ARGON-argon dating; VOLCANIC fieldsRUSSIA
Subjects: *VOLCANIC fields; *PLAGIOCLASE; *MAGMASNEW Mexico