What does YD stand for?

Their topics include the paradox of diet and technology in the Middle Paleolithic, the antiquity of large-game hunting in the Mediterranean Paleolithic, the importance of process and historical event in the study of the Middle-Upper Paleolithic transition, the archaeological signature of behavioral modernity at the southern periphery of the modern human range, Paleoindian stability during the Younger Dryas in the North American lower Great Lakes, and Vere Gordon Childe and the concept of revolution.

Though no one disputes the frigid period, more and more researchers have been unable to confirm a 2007 finding that says a collision triggered the change, known as the Younger Dryas.

It begins with Acid Rain and Acid Deposition and ends with Younger Dryas in North America.

The planet was just coming out of the latest in a long series of ice ages, but the impact reversed the thaw and sent the Earth into another ice phase known as the Younger Dryas Event.

Known as the Younger Dryas, it was so quick that scientists had thought it was caused by a meteor strike or a sudden release of cold water into the Atlantic from the polar regions.

1994) have established that the Crowfoot Advance in the Rockies is late-Pleistocene in age, and perhaps corresponds with the Younger Dryas cold event of Europe.

Just 10,000 years ago, during a climatic cold snap known as the Younger Dryas, the current was severely weakened, causing northern European temperatures to fall by as much as 10 degrees Fahrenheit," he says.

The era in question coincided with a climatic cold snap known as the Younger Dryas _ dated roughly 11,600-12,800 years ago _ when the sea level was some 200-230 feet lower.