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Politics : Formerly About Advanced Micro Devices -- Ignore unavailable to you. Want to Upgrade?

To: HPilot who wrote (575733)	7/9/2010 12:46:23 PM
From: one_less	1 Recommendation Read Replies (1) \| Respond to of 1570746

Yellowstone National Park covers 2,221,766 acres, which is roughly the size of the state of Connecticut. Most of the park is located in the northwestern corner of Wyoming, but a small portion overlaps that state's boundaries with Montana and Idaho. The park is comprised primarily of high, forested, volcanic plateaus that have been eroded over - the millennia by glaciation and stream flow and that are flanked on the north, east, and south by mountains. The Continental Divide traverses the park from its southeastern corner to its «-western boundary. The elevation of the park averages 8,000 feet, ranging from 5,282 feet in the north, where the Gardner River drains from the park, to 11,358 feet in the east, at the summit of Eagle Peak in the Absaroka Range. yellowstonenationalpark.com

To: HPilot who wrote (575733)	7/9/2010 12:59:50 PM
From: Jorj X Mckie	Respond to of 1570746

Various types of paleoclimatic evidence suggest that the climate of the Earth has varied over time. The data suggests that during most of the Earth's history, global temperatures were probably 8 to 15° Celsius warmer than they are today. However, there were periods of times when the Earth's average global temperature became cold. Cold enough for the formation of alpine glaciers and continental glaciers that extended in to the higher, middle and sometimes lower latitudes. In the last billion years of Earth history, glacial periods have started at roughly 925, 800, 680, 450, 330, and 2 million years before present (B.P.). Of these ice ages, the most severe occurred at 800 million years ago when glaciers came within 5 degrees of the equator. The last major glacial period began about 2,000,000 years B.P. and is commonly known as the Pleistocene or Ice Age. During this glacial period, large glacial ice sheets covered much of North America, Europe, and Asia for long periods of time. The extent of the glacier ice during the Pleistocene, however, was not static. The Pleistocene had periods when the glaciers retreated (interglacial) because of mild temperatures, and advanced because of colder temperatures (glacial). Average global temperatures were probably 4 to 5° Celsius colder than they are today at the peak of the Pleistocene. The most recent glacial retreat began about 14,000 years B.P. and is still going on. We call this period the Holocene epoch. In North America, the Pleistocene glaciers began their formation in the higher altitudes of the Rocky Mountains, and high latitude locations in Greenland and north-central Canada. From these locations, the ice spread in all directions following the topography of the landscape. In North America, the glaciers from the Rocky Mountains and north-central Canada met each other in the center of the continent creating an ice sheet that stretched from the Pacific to the Atlantic ocean. At their greatest extent, the ice sheets of North America covered most of Canada and extended into the United States to a latitude of about 40° North. physicalgeography.net Reno Nevada is at about 40° North. Well south of Yellowstone.

To: HPilot who wrote (575733)	7/18/2010 12:25:04 AM
From: combjelly	Read Replies (2) \| Respond to of 1570746

"Parts of North America was covered in glaciers two miles thick and Yellowstone is about a mile high, so all but the tallest peak was covered in ice. " At the peak, maybe. At the peak, 90% of the present park was covered in ice. But that was 20000 BCE. By 10000 BCE, the time period in question, things had changed quite a bit. Most of the ice had either melted or was in full retreat. The mountains had mainly snow pack and ice fields, although there were a few glaciers left. So the artifact found is similar to the find of Oesti. It got deposited in snow that later turned to ice and has just now melted out. It isn't like it was trapped in a glacier.