LectureCh.17 Neogene STUDENTS - Ch. 17: Cenozoic Geologic...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Ch. 17: Cenozoic Geologic History: The Pleistocene and Holocene Epochs Key words - Orogenies and volcanism - Pleistocene glaciation - Stratigraphy - Climate change The Pleistocene and Holocene Epochs - Begins: 1.8 mya Ends: still on going (“40 sec”) “Recent”: 10,000 years until present “Ice Age”: glaciation, homo sapiens Tectonics and Volcanism - Continuing orogonies: Andes Mts, Himalayas - Deformation along convergent plate boundaries: Aleutians Islands, Japan, Philippines - San Andreas Fault: folding (warm enough), faulting (fracture), basins + uplift (marine terraces, Southern CA) - Cascade Range: large volcanoes - Volcanism in other areas US: Craters of the Moon (Idaho), Sunset Crater (AZ), Lava Beds NM (CA) - Calderas (collapsed volcanoes): Yellowstone NP (WY) - Global volcanism: Ring of Fire (Hawaii, Alaska, Japan, Philippines, S 1
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
America, E Indies, Iceland, Spitsbergen, Azores) Climate - Pleistocene: cooles - Holocene (begins 10,000 y ago): warmes - Evidence: vegetation (pollen analysis), oxygen isotope ratios Terrestrial Stratigraphy - Mapping of glacial features o Moraines o Erratics (foreign rock boulders) o Striation marks (scratches on rocks) o Glacial polish - Greatest extend of Pleistocene glaciers: about 3x more of Earth’s surface covered than today, ice up to 3 km thick - Several glacial advances and retreats - In N-America: 4 glacial stages o Wisconsinan youngest o Illinoian older o Kansan older o Nebraskan oldest o States representing the southernmost advances of glaciation - In N-America: 3 interglacial stages o Sangamon o Yarmouth o Aftonian o Localities where interglacial soils are exposed - In Europe: 6/7 major advances and retreats - In deep-sea cores: minimum of 20 cold-warm cycles - No correlation between marine and terrestrial data (time lag, data destroyed on land) Deep-Sea Stratigraphy - Changes in ocean surface T recorded in shells of planktonic foraminifera o
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 03/27/2012 for the course GEOL 2413 taught by Professor Moody during the Spring '10 term at Texas A&M University, Corpus Christi.

Page1 / 6

LectureCh.17 Neogene STUDENTS - Ch. 17: Cenozoic Geologic...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online