November 30, 2009 BReading Ch. 14 BFinal Exam date: TU, Dec. 15 Monster worm and sea star frenzy...
-
Upload
percival-norris -
Category
Documents
-
view
216 -
download
1
Transcript of November 30, 2009 BReading Ch. 14 BFinal Exam date: TU, Dec. 15 Monster worm and sea star frenzy...
November 30, 2009
Reading Ch. 14 Final Exam date: TU, Dec. 15
Monster worm and sea star frenzyDeep under the Antarctic ice, a rare, colourful burst of starfish and 3m-long monster worms has been filmed by a BBC camera crew. Filmed in time-lapse, the extraordinary swarm of deep-sea creatures gathers to feed in a frenzy on the body of a seal, which had sunk to the ocean floor. Such a bounty of food may only occur once every ten years in the ice-cold waters of McMurdo Sound, Antarctica. The images were taken by divers filming for the natural history series Life. The time-lapse sequence revealed the feeding frenzy of hundreds of huge worms, starfish, brittle stars and sea-urchins.
Refresher…late Paleozoic Geology
• Absaroka transgression• Cratonic deformation
Ouachita belt
– Ancestral Rockies Alleghanian orogeny
– Final Appalachian
• Formation of Pangea
Life• Marine
Major carbonate reefs Ray finned fishes, sharks
• Terrestrial primitive gymnosperms Insects (arthropods) Amphibians and first reptiles
• Permian extinction
Mesozoic Era
Time frame• 250-65 mya
Age of Reptiles Breakup of Pangea
http://www.museulourinha.org/images/dinos_ilustracao.jpg
Breakup of Pangea
Occurred late Triassic through Cretaceous• N. America and Africa split• Greenland and Europe split
Newark rifts• Stretching crust• Basalt injections
The Palisades, NJ
Palisades(basaltic sill)
http://piercehaviland.com/Scenic/Palisades/index.htmhttp://www.semp.us/publications/biot_reader.php?BiotID=348http://www.math.montana.edu/~nmp/materials/ess/geosphere/inter/activities/exploration/index.html
http://www.sfr.cas.psu.edu/Stauffer/nsf/malawi.htmhttp://scienceblogs.com/eruptions/2009/11/the_rifting_of_africa.php
2005 eruptions
East African Rift Valley
Weathering of uplifted regions• Newark Supergroup
Red, non-marine sediments
Formation of aulacogens • Basins bounded by faults
Breakup of Pangea
Reptile tracks, CT
Breakup of Pangea North Atlantic Ocean basin
• Rapidly widening
http://quakeinfo.ucsd.edu/~hedlin/erth10/Lecture16/white-cliffs.jpeghttp://geography.howstuffworks.com/terms-and-associations/pangaea-supercontinent.htm/printable
Gulf of Mexico• Restricted basin• Evaporite deposition
LA salt domesPetroleum traps
Chalk deposition• White Cliffs of Dover
Interior Craton Red sediments transported west
• Moenkopi Formation
Quartz sands deposited• Navajo Sandstone, UT
Flaming Gorge, WY
http://3dparks.wr.usgs.gov/capitol2/html/3d155.html
Moenkopi Fn
Chinle Fn
Wingate Sandstone
Navajo Sandstone, UT
Interior Craton Changes in sea level
• Sundance Formation
http://www.fhsu.edu/biology/cbennett/research_photos.htmlhttp://www.geo-sciences.com/images_geology-2.htmhttp://www3.interscience.wiley.com:8100/legacy/college/levin/0470000201/chap_tutorial/ch11/chapter11-4.html
Sundance Fn, WY
Gypsum Springs, CO
Dinosaur National Park, UT
Erosion of western highlands• Morrison Formation
Cordillera Belt Western margin activity intensified Most of western margin is ‘foreign’
• suspect and exotic terranes Ex: Wrangell Mts, AK
http://www.my-photo-blog.com/category/travel/alaska/wrangell-st-eliashttp://pubs.usgs.gov/dds/dds-81/Intro/TopographicData/DEM/DEM.htmlhttp://www.umt.edu/geosciences/faculty/sears/animation/latecretaceous.htm
Sonoma Orogeny Island arc collision
• Forearc basin (Great Valley Grp)Volcanic & ocean sediments
• Accretionary prism (Fransciscan Cx)blueschists
• Foreland basin (Morrison Fmn)Volcanic & terrestrial sediments
http://www.geol.umd.edu/~tholtz/G102/102meso1.htm