Rock Structures. Mt. St. Helens, October 2004. Igneous Structures: Plutons, Volcanoes, & Lava Flows (Oh, My!). Plutons. Name this Igneous Feature…. Igneous Dike. Plutonic Structures. Xenoliths. Source: William E. Ferguson. Why do we find Plutons at the Surface?. Uplift & Erosion.
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Rock Structures Mt. St. Helens, October 2004
Name this Igneous Feature… Igneous Dike
Plutonic Structures Xenoliths Source:William E. Ferguson
Why do we find Plutons at the Surface? Uplift & Erosion Sierra Nevada Mountains Batholith, California
Volcanic Structures Mafic vs. Intermediate/Felsic
Bedding (1-300 cm) Stratafication Laminations (<1 cm) Massive Strata (>300 cm)
Inter-Bed Structures(within strata) • Graded Beds • Cross Beds • Dropstones Outcrop of turbidites, Carboniferous, northwestern China.
Intra-Bed Structures(on the surface of strata) • Ripple Marks • Mudcracks • Raindrop Impressions
Trace Fossils Coprolites Miocene Mammal (WA) Worm Burrows: Middle Silurian, Grimsby Formation, Hamilton, Ontario