GEO 102 Lecture 32Outline of Last Lecture I. Extinction and what is a dinosaur?Outline of Current Lecture II. What happens when plates collide?III. AppalachiansIV. Rocky MountainsV. AndesVI. HimalayasCurrent LectureWhat Happens when plates collide?- Ocean versus continental o Oceanic plates subducto Volcanic arcs and mountains- Ocean versus oceano Older, cooler, and denser plates o Volcanic arcs- Continent versus continento Collision, no subduction, thickened structureo Largest mountainsAppalachians - Taconic orogeny (496-440 million years ago)- Major events begano ~300 million years ago (Pangea)- Several events combined o Acadiano Alleghenian (Appalachian)Rocky Mountains- Laramide orogeny- ~70-80 million years ago until ~35-55 million years agoThese notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.- Episodic- Convergent ocean-continental boundary- Little volcanism, low subduction angleAndes- Classic ocean-continental subduction- 200 million years ago to present- Altiplano contributed too Cenozoic cooling- 2nd highest rangeHimalayas- Highest mountain range- Still forming- Continent-continent collision- Led to Cenozoic
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