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Geologic units containing alkalic volcanic rock
Alkalic volcanic rock
A volcanic rock that contains more sodium and/or potassium than is required to form feldspar with the available silica.
- New Mexico
- felsic shallow-intrusive rocks (Phanerozoic | Cenozoic | Tertiary)
- Middle Tertiary felsic shallow-intrusive rocks; phonolites and trachytes of northeastern N.M.; includes the rhyolite of Ash Mountain
- Alkalic extrusive and intrusive igneous rocks (Phanerozoic | Cenozoic | Tertiary | Eocene)
- ALKALIC INTRUSIVE AND EXTRUSIVE IGNEOUS ROCKS (AGE ABOUT 44 Ma)--Light- to greenish-gray porphyry.
- Alkalic extrusive and intrusive igneous rocks (Phanerozoic | Cenozoic | Quaternary)
- ALKALIC EXTRUSIVE AND INTRUSIVE IGNEOUS ROCKS (AGE 1.25 Ma)--Leucite- and nepheline-rich flows, scoria, and necks.