Younger Dryas Black Mat Boundary
Pin By Larry On Younger Dryas Younger Dryas Younger
Gorgeous Lafayette Point Recently Found Central Florida Native American Artifacts Indian Artifacts Prehistoric
Earth S Major Mass Extinction Events Extinction Earth Science Festival
How To Make An Interesting Art Piece Using Tree Branches Ehow Interesting Art Moab Beautiful Places In The World
Hre Europe By Arminius1871 Map Historical Maps History
Botswana The Kalahari Desert San Hunters Hunter Gatherer Human Documentary Hunting Pictures
The younger dryas boundary lies at the base of the yd black mat.
Younger dryas black mat boundary. A study of the magnetic fraction from the basal section of the black mat at murray springs az revealed the presence of amorphous iron oxide framboids in a glassy iron silica matrix. Younger dryas black mat characteristics. What is the younger dryas boundary ydb. Cordilleran section of the.
No in situ clovis points and extinct megafaunal remains have been recovered from the black mat line or above the black sediments indicating that the mammoths and clovis hunting technology disappeared simultaneously. The younger dryas interval yd was a period of widespread abrupt climate change that occurred between 12 900 and 11 700 cal yr bp 10 900 10 000 14c bp. At the end of the pleistocene a younger dryas black mat was deposited on top of the pleistocene sediments in many parts of north america. A black mat of carbonaceous material is associated with the onset of the younger dryas cooling event 12 800 years ago.
Black mat is the common name for an organic rich layer of soil also called sapropelic silt peaty muds and paleo aquolls its content is variable and its appearance is variable and it is at the heart of a controversial theory known as the younger dryas impact hypothesis ydih. 2009 and firestone 2007 2009 have reported evidence of widespread biomass burning and the emplacement of a black mat at the younger dryas boundary. Comet research group author provided magnetic grains often too small to see with the naked eye can be formed from iron common in asteroids and comets vaporizing at very high temperature in a massive explosion for example and then condensing into microscopic magnetic iron. Many sites in the northern hemisphere preserve a sedimentary record across the onset of the yd interval including sites investigated in sedimentary basins located in central mexico chapala cuitzeo acambay the basin of mexico.
The younger dryas impact hypothesis or clovis comet hypothesis posits that fragments of a large more than 4 kilometers in diameter disintegrating asteroid or comet struck north america south america europe and western asia about 12 800 years ago. Haynes cv jr 1987 centennial field guide volume 1.
