GEO 120 Lecture Notes - Lecture 24: Denali National Park And Preserve, Baja California Peninsula, Terrane
7 Dec 2016
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Geo 120 - lecture 24 - accreted terrains - elizabeth laliberte. Craton- the nucleus of the continent that has been growing outward over time. Continental shield- exposures of very old igneous and metamorphic rocks. Continental platform- sedimentary deposits from shallow seas lapping up on the craton. Colorado plateau- uplifted part of the continental platform. Phanerozoic orogenic belts- relatively young mountain ranges that surround the craton. Cordillera: mountainous region of western north and south america. Coastal plain- young sedimentary layers deposited on the edge of the continent. A large part of western north america was added to the edge of the continent during the last 20 mill years. Rocks were formed elsewhere, transported by transform or convergent plate motion and then slammed into the edge of the continent. Can be mapped with a magnetometer by examining variations in magnetic intensity. More than 1,000 miles south of alaska about 45 mya. Moving northward and crashed into the embayment.
