Sentences with phrase «evidence of an ice age»

There's no evidence of the great flood, but there is plenty of evidence of an Ice Age.

«Evidence of Ice Age «economic migrants» in Europe to be unearthed.»

Not exact matches

To the surprise of everyone who knew about the strong evidence for the little ice age and the medieval climate optimum, the graph showed a nearly constant temperature from the year 1000 until about 150 years ago, when the temperature began to rise abruptly like the blade of a hockey stick.

There is no evidence for significant increase of CO2 in the medieval warm period, nor for a significant decrease at the time of the subsequent little ice age.

One book I recently read, claimed that every ice - age, and pre-ice-age door ever found, was either littered with arrowheads, or bore evidence of being the subject of s sustained assault by arrows, and other implements of violence.

There is no reliable evidence of modern humans elsewhere in the Old World until 60,000 - 40,000 years ago, during a short temperate period in the midst of the last ice age.

There is no evidence that any man's intellect on earth today is equal to Aristotle's, nor do we know with any surety that the brain capacity of mankind as a whole is greater now than it was in the Ice Age.

«13,000 - year - old human footprints found off Canada's Pacific coast: New evidence of human population living on the west coast of Canada at the end of last ice age.»

This finding adds to the growing body of evidence supporting the hypothesis that humans used a coastal route to move from Asia to North America during the last ice age.

«This finding provides evidence of the seafaring people who inhabited this area during the tail end of the last major ice age.»

«13,000 - year - old human footprints found off Canada's Pacific coast: New evidence of human population living on the west coast of Canada at the end of last ice age.»

Ice Age evidence suggests rising temperatures could boost areas of ocean water with little oxygen for life

An Ice Age paleontological - turned - archaeological site in San Diego, Calif., preserves 130,000 - year - old bones and teeth of a mastodon that show evidence of modification by early humans.

Earth is thought to have shifted in and out of ice ages every 100,000 years or so during the past 800,000 years, but there is evidence that such a shift took place every 40,000 years prior to that time.

The researchers found that three sites lack absolute age control: at Chobot, Alberta, the three Clovis points found lack stratigraphic context, and the majority of other diagnostic artifacts are younger than Clovis by thousands of years; at Morley, Alberta, ridges are assumed without evidence to be chronologically correlated with Ice Age hills 2,600 kilometers away; and at Paw Paw Cove, Maryland, horizontal integrity of the Clovis artifacts found is compromised, according to that site's principal archaeologiage control: at Chobot, Alberta, the three Clovis points found lack stratigraphic context, and the majority of other diagnostic artifacts are younger than Clovis by thousands of years; at Morley, Alberta, ridges are assumed without evidence to be chronologically correlated with Ice Age hills 2,600 kilometers away; and at Paw Paw Cove, Maryland, horizontal integrity of the Clovis artifacts found is compromised, according to that site's principal archaeologiAge hills 2,600 kilometers away; and at Paw Paw Cove, Maryland, horizontal integrity of the Clovis artifacts found is compromised, according to that site's principal archaeologist.

The thrust of the genetic and archaeological evidence is that the ancestors of Native Americans walked or paddled from Siberia between 13,000 and 17,000 years ago, at the height of the last ice age.

Other fossil evidence dating back to the ice - age origins of some of the lakes shows the changes of the last century - and - a-half are unprecedented, he adds.

As one of the world's leading authorities on ancient seafaring, he has devoted much of his career to hunting down hard evidence of ancient human migrations, searching for something most archaeologists long thought a figment: Ice Age mariners.

The most plausible explanation of how humans first settled the Americas — Ice Age hunters pursuing game walked from Siberia to Alaska over a land bridge — has gained wide acceptance in recent years, although scientific evidence has been thin at best.

Focusing on evidence from three distinct time periods — the end of the last Ice Age, the stage when Zanzibar became an island 11,000 years ago, and the time of being an island — researchers found that numerous large mammals had disappeared by the latter stage.

«This shift to earlier weaning age in the time leading up to woolly mammoth extinction provides compelling evidence of hunting pressure and adds to a growing body of life - history data that are inconsistent with the idea that climate changes drove the extinctions of many large ice - age mammals,» said Cherney, who is conducting the work for his doctoral dissertation in the U-M Department of Earth and Environmental Sciences.

Now, new evidence from a marine sediment core from the deep Pacific points to warmer ocean waters around Antarctica (in sync with the Milankovitch cycle)-- not greenhouse gases — as the culprit behind the thawing of the last ice age.

A team led by geochemist Dr. Katharina Pahnke from Oldenburg has discovered important evidence that the rise in atmospheric carbon dioxide levels at the end of the last ice age was triggered by changes in the Antarctic Ocean.

Re 92 and 105: First I just want to reitterate more generally what 105 said — Milankovitch cycles have had climate signals, in ice ages or otherwise, — well probably ever since the Moon formed, although the signal from times past will not always reach us, but I've read of evidence of Milankovitch precession cycle forcing of monsoons in lakes in Pangea (PS over geologic time the periods of some of the Milankovitch cycles have changed as the Moon recedes from the Earth due to tides).

This adds evidence for the controversial theory that seafaring people used a coastal route to move from Asia to North America at the very end of the last ice age, which ended 11,700 years ago.

There is evidence that greenhouse gas levels fell at the start of ice ages and rose during the retreat of the ice sheets, but it is difficult to establish cause and effect (see the notes above on the role of weathering).

Geological evidence for ice ages comes in various forms, including rock scouring and scratching, glacial moraines, drumlins, valley cutting, and the deposition of till or tillites and glacial erratics.

Hence the continental crust phenomena are accepted as good evidence of earlier ice ages when they are found in layers created much earlier than the time range for which ice cores and ocean sediment cores are available.

The existence of a Little Ice Age from roughly 1500 to 1850 is supported by a wide variety of evidence including ice cores, tree rings, borehole temperatures, glacier length records, and historical documenIce Age from roughly 1500 to 1850 is supported by a wide variety of evidence including ice cores, tree rings, borehole temperatures, glacier length records, and historical documenice cores, tree rings, borehole temperatures, glacier length records, and historical documents.

In a new study out last month in the journal Nature, a team of scientists from Cambridge and Sweden point to evidence from thousands of scratches left by ancient icebergs on the ocean floor, indicating that Pine Island's glaciers shattered in a relatively short amount of time at the end of the last ice age.

Evidence of Little Ice Age cooling in West Antarctica from borehole temperature.

Ice Age Floods National Geologic Trail — see evidence of the largest and most powerful floods that have ever occurred on Earth.

Stresa is a town and comune of about 5,000 residents on the shores of Lake Maggiore in the province of Verbano - Cusio - Ossola in the Piedmont region of Ice Age Floods National Geologic Trail — see evidence of the largest and most powerful floods that have ever occurred on Earth.

The assessment examines the following content; global warming, the greenhouse effect / gases, natural and human causes of past climate change, evidence of the little ice age, features of tropical storms and the effects and response to tropical storms.

The caves in the limestone gorge of Creswell Crags have provided archaeologists with important evidence of human activity towards the end of the last Ice Age when the area was right at the edge of the ice sheIce Age when the area was right at the edge of the ice sheice sheet.

Evidence for the maximum lowering of sea level during successive ice ages over the past several millions of years is sparse.

However, in periods in the past, say around 8,200 years ago, or during the last ice age, there is lots of evidence that this circulation was greatly reduced, possibly as a function of surface freshwater forcing from large lake collapses or from the ice sheets.

Mike's work, like that of previous award winners, is diverse, and includes pioneering and highly cited work in time series analysis (an elegant use of Thomson's multitaper spectral analysis approach to detect spatiotemporal oscillations in the climate record and methods for smoothing temporal data), decadal climate variability (the term «Atlantic Multidecadal Oscillation» or «AMO» was coined by Mike in an interview with Science's Richard Kerr about a paper he had published with Tom Delworth of GFDL showing evidence in both climate model simulations and observational data for a 50 - 70 year oscillation in the climate system; significantly Mike also published work with Kerry Emanuel in 2006 showing that the AMO concept has been overstated as regards its role in 20th century tropical Atlantic SST changes, a finding recently reaffirmed by a study published in Nature), in showing how changes in radiative forcing from volcanoes can affect ENSO, in examining the role of solar variations in explaining the pattern of the Medieval Climate Anomaly and Little Ice Age, the relationship between the climate changes of past centuries and phenomena such as Atlantic tropical cyclones and global sea level, and even a bit of work in atmospheric chemistry (an analysis of beryllium - 7 measurements).

«I would say that this is another piece of evidence that strengthens the argument that humans are now capable of preventing the onset of a future ice age,» he told me.

The paper, combining evidence of driftwood accumulation and beach formation in northern Greenland with evidence of past sea - ice extent in parts of Canada, concludes that Arctic sea ice appears to have retreated far more in some spans since the end of the last ice age than it has in recent years.

It also constitutes evidence refuting assertions of pundits who have periodically proclaimed that climate scientists warning about warming can not be trusted because they were proclaiming the dawn of an ice age in the 1970s.

Those questioning the vulnerability of this species to warming will point to its successful survival through two previous warm intervals between ice ages as evidence the bear can deal with reduced ice and other big environmental shifts.

Below you'll hear from scientists with significant concerns about keystone sections of the paper — on the evidence for «superstorms» in the last warm interval between ice ages, the Eemian, and on the pace at which seas could rise and the imminence of any substantial uptick in the rate of coastal inundation.

Plenty of evidence suggests we have already cancelled the next ice age.

I'm in Oslo at a meeting of the Anthropocene Working Group, which is in final face - to - face deliberations over evidence that the Holocene, the geological epoch that began at the end of the last ice age, has given way to a new age shaped by humans.

They claim that the evidence for Milankovitch forcing of the ice ages implies that the planet is hypersensitive to solar irradiance variations.

In fact previous climate warming after the last ice age did have significant negative impacts on early human settlements (evidence of periods of significant and rapid regional sea level rise).

Brian, I'd recommend that you run the talking points through a reality check before attaching your name to them — one excellent resource is skepticalscience.com, from whence (after.1 second of effort) I reached the rebuttal to «Scientists predicted an impending ice age in the 1970's» («Is it really appropriate to compare the scientific evidence for an impending ice age in the 70's to the scientific consensus on anthropogenic global warming today?»

[14] Although there is an extreme scarcity of data from Australia (for both the Medieval Warm Period and Little Ice Age) evidence from wave built shingle terraces for a permanently full Lake Eyre during the ninth and tenth centuries is consistent with this La Niña - like configuration, though of itself inadequate to show how lake levels varied from year to year or what climatic conditions elsewhere in Australia were like.

The very next year the same magazine reported that «The world may be inching into a prolonged warming trend that is the direct result of burning more and more fossil fuels...» The ice - age theories, said the article, «are being convincingly opposed by growing evidence of human impact.»