geospatial animation of Postglacial
Flooding of the Bering Land Bridge (Manley,
Around 21,000 years ago during the Last Glacial Maximum (LGM),
the Bering Land Bridge existed as a vast tundra plain connecting
Asia and North America. Global sea level was approximately 120
m (400 ft.) lower than today. As climate warmed and the world's
glaciers and ice sheets melted, flooding the land bridge.
Check out the Beringian
Paleoenvironmental Atlas that focuses on northwestern North
America and northeastern Asia during the most recent Ice Age.
Resources include an Image
Gallery with animations of sea level rise and the flooding
of the Bering Land Bridge.
of Human Evolution
- Did huge eruption of Mount Tomba in the middle of the Indonesia
island of Sumatra cause a volcanic winter 71,000 years ago create
a bottleneck in human evolution?
A quick background to the last ice
the Oak Ridge National Lab.
Another online resource
that focuses on archeology and anthropology relating to the past
+100,000 years is the Hooper
Virtual Natural History Museum which
provides information on:
The NOAA Paleoclimatology
Program offers an online slideset about the Ice
Ages that traces the scientific investigation of the ice
ages, from the discovery of glacial erratics and moraines by
early geologists in the 1800s, to the initial theories of orbital
variations in solar radiation, to recent investigations of the
glacial-interglacial cycles based on evidence found in ice cores
and deep sea sediments.
Also see the Cape
Field School for more on the excavations at Blombos Cave
discussed in Climate History 100,000
Years. Additional cave art photos from the French government's
Great Archeological Site.
Humans Evolve as Aquatic Apes?
Ape theory, first suggested in the 1920s by Sir Alister Hardy,
popularized by Desmond Morris
(1967) in the book The Naked Ape, and more recently updated
by anthropologist Elaine Morgan
(1999), suggests that early humans evolved in and around water,
with fish being an important part of their diet.
Recently Michael Crawford (1999)
and other researchers have found that fish
oil may be the key for why the human brain grew larger than other
primates. The theory is controversial, being at odds with
the generally accepted theory that early humans developed on the
dry savannahs of Africa. Not all experts on human evolution convinced
that the Aquatic Ape hypothesis holds water, but the fossil record
is lacking to provide compelling proof for or against the idea.
For more, visit the Aquatic Ape website: The
Role of Water in Human Evolution: A
Look at Some New Ideas About Our Ancestors by Catherine Friedl
from the Hooper Natural History Museum.
Image above from the Hooper Natural History Museum.