and a lower unit of microsyenite with red and green glassy zenocrysts. The Intra Caldera Assemblage is best exposed on the north edge of the caldera. The lower unit, indicative of caldera formation, is an epiclastic boulder-landslide deposit, roughly bedded and dipping into the caldera. Similar material, grading up into finer debris flows and possibly lahars, has been uncertainly known in the gap between Phacelia Peak and Calliope Mountain suggesting this area is the southern edge of the caldera. Alternatively, largely unsorted breccia and debris deposits exist on the ridge north of Saxifraga Peak, possibly indicating the main, or a subsidiary, caldera edge. The Shield Forming Assemblage contains a series of basalt and minor comendite eruptions, and is best exposed on Far Mountain and Mount Scot. The basalts issued from fissure vents primarily located peripheral to the calderas. Brick red cinder deposits are considered to be a late phase of this assemblage. Provincial Park Surrounding and including the range is Itcha Ilgachuz Provincial Park, a 112,000-hectare park of unique landscape in the West Chilcotin Uplands while the Rainbow Range lies partly in the Tweedsmuir South Provincial Park. The park includes volcanic landforms, alpine environments, and forest sites scattered with wetlands. Itcha Ilgachuz Provincial Park is extremely remote and unroaded; the closest communities are Anahim Lake, Alexis Creek, Nimpo Lake, Redstone, and Nazko. The closest major centre is Quesnel, located approximately 200 km east of the park. Subsidiary peaks Peaks within the Ilgachuz Range include: Calliope Mountain Camlick Mountain Campanula Peak Cindercone Peak Crepis Peak Far Mountain Go-around Mountain Hump Mountain Mizzen Mountain Mount Scot Phacelia Peak Pipe Organ Mountain Saxifraga Mountain Tundra Mountain See also Anahim hotspot Anahim Volcanic Belt Festuca Pass Itcha Ilgachuz Provincial Park Itcha Range List of volcanoes in Canada Rainbow Range Tweedsmuir South Provincial Park Volcanology of Canada Volcanology of Western Canada References External links Skiing the Pacific Ring of Fire and Beyond: Ilgachuz Range Landforms of the Chilcotin Hotspot volcanoes Inactive volcanoes Miocene shield volcanoes Pliocene shield volcanoes Polygenetic shield volcanoes Range 3 Coast Land District Shield volcanoes of Canada Calderas of British Columbia Tsilhqot'in Mountain ranges of the Interior Plateau