This study was conducted in response to concerns raised by local residents about water quality in Fisherman Lake, located 18 kilometres north-west of Fort Liard, Northwest Territories. Field investigation of the lake revealed the existence of 13 gas seeps (largely methane) with distinct bubble trains rising continuously to the surface. This paper presents results of analyses of the gas & of the lake water and the determination, through isotope analyses, of whether the gas is of biogenic origin (related to the decomposition of organic matter) or thermogenic origin (representing a seep from geological strata of the gas field below the lake). The possible effects of methane on the lake water are also discussed and recommendations are made for further research.

The West Tuya lava field is located about 95 kilometres north-north-west of Dease Lake, British Columbia. This report presents an overview & summary of field work, geographic information system spatial analysis, and preliminary petrographic analysis conducted at the field in 2003-04. Highlights of this work include: identification of three sub-aerial shield volcanoes and their mineral composition; confirmation that mantle-derived peridotite inclusions are present at two of the volcanoes; and interpretation of the sub-aerial lava flows. The minimum and maximum volumes of material erupted are also estimated.

Written by a career geologist with decades of experience in the field, North America’s Natural Wonders provides everything the reader needs to understand the landscape. It guides readers through the most iconic, geologically significant scenery in North America, points out features of interest, explains what they are seeing, and describes how these features came to be. Presented as classic excursions to some of the best-known natural wonders on the continent, Volume I focuses primarily on Western North America, including the Canadian Rockies, California, the Southwest, Great Basin, and Tetons-Yellowstone Country. The trips detailed in this volume include stops at quintessential features, such as the glaciers and mountains of Banff National Park, Yosemite, the vineyards of Napa Valley, the California goldfields, the Grand Canyon, numerous parks in Utah, the geysers and hot springs of Yellowstone National Park, as well as many others. It also features discussions of lesser-known but equally interesting geologic formations and important information on accessing these sites. Features Addresses issues of interest, such as fossils, earthquakes, mineral sites, mining, and oil fields Lavishly illustrated with numerous colorful maps and breathtaking geological landscapes and their various features These five self-guided tours explain to the curious layman, student, and geologist what they are seeing when they look at a roadcut or a quarry and enhances the experience far beyond simple sightseeing.