September 8, 2008 Conglomerates - cas.umt.edu · Autobreccia Hyaloclastic breccia Landslide and...

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G433 – Sedimentary Petrology

September 8, 2008Conglomerates

Compositionally-based conglomerate classification

Volcanic debris- and hyperconcentrated flow deposits

– Eocene Absaroka volcanics, Yellowstone

Eocene Absaroka volcanics, Yellowstone

Fluvial vs. alluvial conglomerates, Shoshone R. Canyon, Wyoming

Stream-lain conglomerates, northern Yellowstone NP

Flat-pebble conglomerate; Cambrian Gallatin Formation, NE Yellowstone

Origin of flat-pebble conglomerates

Glacial diamict

Ice transportglacial moraine near

Polson, MT

Madison Slide, August 17, 1959looking south towards breakaway zone

Graham et al., 1987

Sphinx Mountain Conglomerate (Maastrictian), SW Montana

Inverted stratigraphyduring unroofing;Graham et al., 1987

Graham et al., 1987

Graham et al., 1987

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