may have been controlled by a fault system. More than 20 volcanoes have been identified throughout the Satah Mountain volcanic field, with Satah Mountain and Mount Punkutlaenkut being the largest. Smaller centres include Jorgensen Hill, Sugarloaf Mountain, Turbo Lake, White Creek and Holte Creek. The Baldface Mountain volcanic field is a group of scattered cones east of the Itcha Range. Argon–argon dating of seven cones indicate the volcanic field was active 2.5 to 0.91 million years ago, during which time the Itcha Range and the Satah Mountain volcanic field were also areas of volcanicity. Baldface Mountain is the largest and one of the oldest volcanoes in the Baldface Mountain volcanic field. It consists of a 2.37 million year old cone of aphanitic phonolite and porphyritic trachyte with feldspar phenocrysts. A basaltic lava flow near the head of Moore Creek has an age of 3.91 million years, similar to the oldest rocks known from the Itcha Range or the Chilcotin Group basalts of the surrounding plateau. The relation of this flow to the Baldface Mountain volcanic field is in question as its source and extent have not been identified. Eastern segment Nazko Cone is the main eruptive centre forming the eastern segment of the AVB. It consists of overlapping piles of basaltic flows and cones that were formed during at least three eruptive periods. The first volcanic episode is represented by a subaerial basalt flow that forms the base of the volcano. It was deposited during a Pleistocene interglacial stage 0.34 million years ago and is extensively eroded. The second episode is constituted by a subglacial mound of hyaloclastite that formed under the Cordilleran Ice Sheet, perhaps during the Fraser Glaciation which took place between 25,000 and 10,000 years ago. It forms the western side of Nazko Cone and is dominated by blocks of highly vesicular, glassy basalt. The third episode is defined by coalescing pyroclastic cones and associated lava flows that formed subaerially during the Holocene. Radiocarbon dating of bog peat above and below a tephra layer near Nazko Cone suggest that the latest eruption took place about 7,200 years ago. This is the only known Holocene eruption from Nazko Cone as no other tephra layers have been identified. From 9 October 2007 to 15 May 2008, a series of earthquakes measuring up to 2.9 magnitude occurred in the Nechako Basin about west of Nazko Cone. Most of them occurred