Earth Science News  





. Late Pleistocene Americans Faced Chaotic Climate Change Environments

During the Pleistocene large eastern coastal resources existed, including walruses, south, as far as Virginia, seals and a variety of fish. Mammoth, caribou and mastodons were plentiful across the continent as well as smaller animals.
by Staff Writers
University Park PA (SPX) Feb 20, 2006
The environment encountered when the first people emigrated into the New World was variable and ever-changing, according to a Penn State geologist. "The New World was not a nice quiet place when humans came," says Dr. Russell Graham, associate professor of geology and director of the Earth & Mineral Sciences Museum.

Archaeologists agree that by 11,000 years ago, people were spread across North and South America, but evidence is building for an earlier entry into the New World, a date that would put human population of North and South America firmly in the Pleistocene.

"We want to know what it was like back then," says Graham. "What did they have to deal with?"

The Pleistocene Holocene transition took place about 11,000 years ago and caused the extinction of a large number of animal species including mammoths, mastodons and ground sloths. The Holocene looked very different from the Pleistocene.

"We now realize that climate changes extremely rapidly," Graham told attendees at the annual meeting of the American Association for the Advancement of Science today (Feb.19) in St. Louis, Mo. "The Pleistocene to Holocene transition occurred in about 40 years."

As a result, animals and plants shifted around and the people living in the New World had to adapt so that they could find the necessary resources to survive. Graham likened the change to the difference between shopping at a WalMart where there is great abundance and large variety the Pleistocene to suddenly having to shop at a corner convenience store the Holocene. In human terms this means that what grandparents knew to be true about finding resources, could be untrue and not helpful to grandchildren.

During the Pleistocene large eastern coastal resources existed, including walruses, south, as far as Virginia, seals and a variety of fish. Mammoth, caribou and mastodons were plentiful across the continent as well as smaller animals. The situation was not identical in all places across North America because, during segments of the Pleistocene, large portions of the Eastern North American continent were covered in ice, while western locations were ice free much further north.

"The Holocene climate is much more stable than the Pleistocene warmer but more stable," says Graham. "The environment, however, became more homogeneous, there was less variety."

Graham argues that the Pleistocene experienced a series of rapid climate changes that created patchiness in the environment, but that once the climate change that signaled the beginning of the Holocene occurred, the climate settled down. Humans coming into the New World during the late Pleistocene would have encountered an environment shaped by rapid changes creating variety in available food sources both animal and vegetable. The groups of people would have to adapt continually and find new resources, but the variety of resources was out there. After the Holocene took hold, there was less need to adapt constantly, but also fewer options in resources.

Archaeologists and geologists debate whether the climate change at the Pleistocene Holocene transition caused the extinction of the mega fauna or if the influx of humans did in the large animals. Graham believes that it was the unstable changing rapidly changing climate, not human predation that killed the large Pleistocene animals.

Related Links
Penn State College Of Earth & Mineral Sciences

Ancient Climate Studies Suggest Earth On Fast Track To Global Warming
Santa Cruz CA (SPX) Feb 16, 2006
Human activities are releasing greenhouse gases more than 30 times faster than the rate of emissions that triggered a period of extreme global warming in the Earth's past, according to an expert on ancient climates.

.
Get Our Free Newsletters Via Email
  



  • Scientists Say California Quake Could Cause Katrina II
  • US Troops Join Landslide Rescue As Buried School Is Located
  • Cornell, WCMC And LockMart To Create Plan To Manage Mass Casualties In Disasters
  • Experiment To Test Crisis Planning

  • Late Pleistocene Americans Faced Chaotic Climate Change Environments
  • Ancient Climate Studies Suggest Earth On Fast Track To Global Warming
  • Antarctic Snow Inaccurate Temperature Archive
  • The Oceans As Carbon Dioxide Sinks: Increasing Our Understanding

  • Earth From Space: Copenhagen, Denmark
  • ALOS Captures First Image of Fujiyama
  • Southern Greenland Glaciers Dumping Ice Faster
  • NASA Satellite Technology Helps Fight Invasive Plant Species

  • Environmental Metagenomics Tapping Opportunities For Clean Energy
  • Walker's World: EU's Bold Caucasus Bid
  • Garbage Truck Industry Ponders Move To LNG
  • Nuclear Fusion On A Tabletop

  • New Influenza Vaccine Takes Weeks To Mass Produce
  • Bird Flu Hits Western Europe
  • Bird Flue Hits Africa
  • 1,500 Cholera Cases In Flood-Hit Mozambique

  • China's Endangered Monkeys Make A Comeback
  • Anti-Evolutionism In America - What's Ahead
  • Are There Aliens Already On Earth
  • Search For Alien Life Challenges Current Concepts

  • Water Cut Off For 20,000 People After Latest Chinese River Toxic Spill
  • China To Step Up Environmental Protection Efforts
  • Disturbing Former Farmlands Can Rouse Old Pesticides
  • China Finds Dangerous Heavy Metals In Fish

  • Scientists Discuss Evolutionary Roots Of Social Behavior
  • Brain Researchers Discover The Evolutionary Traces Of Grammar
  • Most Cave Art The Work Of Teens, Not Shamans
  • New Analysis Shows Three Human Migrations Out Of Africa

  • The content herein, unless otherwise known to be public domain, are Copyright 1995-2006 - SpaceDaily.AFP and UPI Wire Stories are copyright Agence France-Presse and United Press International. ESA PortalReports are copyright European Space Agency. All NASA sourced material is public domain. Additionalcopyrights may apply in whole or part to other bona fide parties. Advertising does not imply endorsement,agreement or approval of any opinions, statements or information provided by SpaceDaily on any Web page published or hosted by SpaceDaily. Privacy Statement