The Armadillo Formation is a stratigraphic unit of Miocene age in northwestern British Columbia , Canada.
4-587: The Armadillo Formation takes its name from Armadillo Peak , a volcanic peak east of Raspberry Pass in the middle of the Mount Edziza volcanic complex . The Armadillo Formation has a volume of 159 km (38 cu mi), making it the most voluminous of the 13 geological formations comprising the Mount Edziza volcanic complex. It conformably overlies the Little Iskut Formation , as well as
8-472: Is anomalously old and most likely results from excessive atmospheric argon . Armadillo Peak Armadillo Peak is a 7.5-million-year-old caldera , located about 3 km north of Bourgeaux Creek and northeast of Raspberry Pass , British Columbia , Canada . It is south of Mount Edziza and is overlapped by the Ice Peak central volcano , which was formed during the early Pleistocene . Its caldera
12-499: Is the main mafic rock of the Armadillo Formation and forms lava flows. K–Ar dating of the Armadillo Formation has yielded ages of 10.2 ± 1.4 million years for comendite, 6.9 ± 0.3 million years and 6.1 ± 0.1 million years for comenditic ash flows , 6.9 ± 0.3 million years for comenditic glass and 6.5 ± 0.2 million years, 6.3 ± 0.5 million years, 6.2 ± 0.1 million years and 6.1 ± 0.2 million years for hawaiite . The first age
16-597: The Raspberry Formation . It is overlain by the Ice Peak Formation, Nido Formation , Spectrum Formation and Big Raven Formation . The Armadillo Formation consists of volcanic rocks of both felsic and mafic compositions. They are the products of a long period of bimodal volcanism , having issued from multiple eruptive centres. The felsic rocks include trachyte and comenditic rhyolite which form pyroclastic deposits, lava domes and lava flows. Basalt
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