Mineral Resources On-Line Spatial Data
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Geologic units containing spilite
An altered basalt, characteristically amygdaloidal or vesicular, in which the feldspar has been albitized and is typically accompanied by chlorite, calcite, epidote, chalcedony, prehnite, or other low-temperature hydrous crystallization products characteristic of a greenstone.
- Volcanic rocks (Triassic and Permian) (Permian to Triassic)
- Massive flows of porphyritic meta-andesite, metabasalt, spilite, and keratophyre, volcanic breccia, and subordinate amounts of fine-grained volcaniclastic rocks. In eastern Oregon probably mostly Late Triassic in age, but includes some Permian rocks (OR084). Includes Clover Creek Greenstone (OR035), Gold Creek greenstone (informal name; OR029), and greenstone of Ashley (OR081)
- Carboniferous-Permian sedimentary and volcanic rocks (Devonian to Permian; some Jurassic)
- Sedimentary and volcanic rocks, undivided. Cherty and slaty argillite, siltstone, graywacke, chert, greenstone, tuff, andesite, and spilitic volcanics.
- Pre-Middle Jurassic volcanic rocks, undivided (Early Cretaceous-Late Jurassic)
- Predominantly greenstone and spilitic volcanic rocks; includes some slate, argillite, and graywacke.