Crater Lake National Park: Geologic Resources Management Issues Scoping Summary Geologic History The Cascades formed as a result of the collision of the San Juan de Fuca plate with the North American plate, a collision still in progress. The oceanic crust is being thrust under or subducted beneath...
geology- a science that deals with the history of the earth as recorded in rocks alluvion- gradual formation of new land, by recession of the sea or deposit of sediment desertification- the gradual transformation of habitable land into desert; is usually caused by climate change or by destructiv...
Crater Lake partly fills one of the most spectacular calderas of the world—an 8 by 10 kilometer (km) basin more than 1 km deep formed by collapse of the Mount Mazama volcano during a rapid series of explosive eruptions ~7,700 years ago. Having a maximum depth of 594 meters (m), Cra...
Consequently, the total number of ejection events for the 16 Martian meteorites lies in the range 4 – 8.The Martian meteorites indicate that Martian magmatism has been active over most of Martian geologic history, in agreement with the inferred very young ages of flood basalt flows observed in...
Google Scholar Zhang Yanling, Shi Yuli, Wang Kaihong, Li Haiyu, Hu Hongxia.2004.Some new breakthroughs in establishing database of geological map of 1:2500000 of Northeast China[J].Jilin Geology 23(4):144-149(in Chinese). Google Scholar Access HistoryFigures...
A few years ago, while scrambling around on some conglomerate in Death Valley, I found a boulder that itself was made of conglomerate: a conglomerate within a conglomerate! Think of its history. The clasts within the conglomerate boulder were made of a variety of sedimentary rocks, mostly limes...
Geologic Maps of the 50 United States Created by Andrew Alden from the U.S. Geological Survey's Geologic Map of the United States, 1974, by Philip King and Helen Beikman ( fair use policy). Rocks of many ages and types crop out in Connecticut, evidence of a long and eventful history....
1: 50 000 regional geological survey report of Maichen, Xiaqiao, Pengbigang, and Xuwenxian map-sheets[R]. (in Chinese). Google Scholar [24] OSORIO-OCAMPO S, MACÍAS J L, POLA A, et al. The eruptive history of the Pátzcuaro Lake area in the Michoacán Guanajuato volcanic field,...
Introduction: The western section of Ladon basin and its bounding basin ring structures to the west hold numerous clues to understanding the long history of drainage across the Margaritifer Terra region of Mars [1-7]. We are mapping two quadrangles in Margaritifer Terra (–15032 and – 20032...
geology- a science that deals with the history of the earth as recorded in rocks aquifer- underground bed or layer yielding ground water for wells and springs etc beach- an area of sand sloping down to the water of a sea or lake