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0000003751 00000 n Denali is a region of great geologic activity and complex-ity, and scientists are only beginning to piece together its puzzling past. Mammoth steppe allowed humans to cross into North America from Siberia. He wrote in his introduction: "If facts are presented which may seem elementary, it is because even well-informed people have been known to harbor misconceptions in regard to the orographic features, climate, and general character of Alaska. 0000006852 00000 n The Alaska Range and Denali: Geology and Orogeny. 0000003128 00000 n

0000046352 00000 n The Brooks Range is a mountain range in far northern North America stretching some 700 miles from west to east across northern Alaska into Canada's Yukon Territory. The Klondike Gold Rush and the stampedes that followed had driven determined souls to the far corners of Alaska.

0000088299 00000 n 0000119497 00000 n While today's scientists sometimes use satellites and other remote-sensing tools to gain information about Alaska without leaving their offices, Brooks and his contemporaries at the U.S. Geological Survey spent entire summers on traverses of Alaska. A Summary of Existing Knowledge," Brooks pointed out misconceptions about Alaska that endure. In the past, most of the snow and ice remained behind; very little melting occurred. 0000005083 00000 n 0000055354 00000 n
on the geology of the Brooks Range. 0000006097 00000 n Glaciers are rivers of ice. The Arctic Alaska terrane consists of parautochthonous rocks and the Endicott Mountains and De Long Mountains subterranes. And then there is my dear friend and closest collaborator Justin Strauss, who is now an assistant professor at Dartmouth College. dl"�>�׀������Ic��� #,� � All of south-central Alaska has been buried in ice numerous times, and the shape of the land in this area comes from the carving forces of glaciers and the debris they leave behind.Erratics are rocks that are foreign to the surrounding terrain. Let those who are not personally familiar with the character of the difficulties not judge it too harshly. %%EOF These limestone and shale layers were both pushed upward and sometimes overridden by the drifting tectonic plate to make up the present core of the Brooks Range.

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Alfred Brooks was a geologist who traveled thousands of miles in Alaska and left his name on the state's northernmost mountain range.

0000064277 00000 n 0 "Alaskan surveys and explorations have never been and never will be easy," Brooks wrote. Brooks Range, Alaska, and accompanying Conodont Data By Alison B. Till, Julie A. Dumoulin, Anita G. Harris, Thomas E. Moore, Heather A. Bleick, and Benjamin R. Siwiec INTRODUCTION This 1:500,000-scale map depicts the bedrock geology of the southern Brooks Range, which spans northern Alaska from west to east. 0000090338 00000 n <<1B80A9B92550D1488C16B1B9B3C15536>]>> Reaching a peak elevation of 8,976 feet on Mount Isto, the range is believed to be approximately 126 million years old. 0000095675 00000 n 0000000016 00000 n 1343 0 obj <>stream During past ice ages, most recently about 10,000 years ago, glaciers covered the Alaska Range and much of Alaska in ice.