Geology of the Sustut
نویسنده
چکیده
pillow lavas are locally conspicuous. A unit consisting of dark, thinly bedded sandstone and siltstone, lccally ranging to several hundred feet thick, is lowermost in the exposed section. The middle division consists of about 3,500 feet of mixed andesi.:e and basalt volcaniclastic rocks ~ lahar, tuff breccia, volcanic sandstone, and conglomeratic beds which rest on relatively thin, fossiliferous, tuffaceous argillite, chert, and carbonate beds. The upper division, about 4,000 feet thick, comprises locally well-layered maroon and grey, welded and nonwelded ash flow tuffs and volcanic breccias ranging from basalt to rhyolite in composition.
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