The Haycock Mountain quadrangle lies in the central part of the Markagunt Plateau in southwest Utah and includes the eastern part of Panguitch Lake, a popular area of summer and winter recreational use. Despite the plateau’s relatively simple structure of a gently east-tilted fault block, the quadrangle contains scenic and instructive exposures of south-west Utah’s youngest basaltic lava flows, classic examples of inverted valleys capped by older lava flows, and the southern margin of the Markagunt Megabreccia, including newly identified, exceptionally instructive exposures of its basil slip surface. The Megabreccia is the debris of Utah’s largest catastrophic landslide deposit, which covers 1300 square miles (3400 km²) of the northern and central Markagunt Plateau.
You might also like
POPULAR POSTS & PAGES
- Rocks and Minerals
- Glad You Asked: Ice Ages – What are they and what causes them?
- Glad You Asked: Igneous, Sedimentary, & Metamorphic Rocks
- Commonly Asked Questions About Utah's Great Salt Lake & Lake Bonneville
- Hazards Maps
- Glad You Asked: How Do Geologists Know How Old a Rock Is?
- Glad You Asked: Have meteorites or meteorite craters been found in Utah?
- Rock & Mineral Collecting Sites
LEARN MORE ABOUT THE UTAH GEOLOGICAL SURVEY
The Utah Geological Survey (UGS) is a division of the Utah Department of Natural Resources. Several specialized programs comprise the UGS: Energy & Minerals, Geologic Hazards, Geologic Information & Outreach, Geologic Mapping, Groundwater & Wetlands, and Paleontology.
1594 West North Temple, Suite 3110
Salt Lake City, Utah 84116
PO BOX 146100
Salt Lake City, Utah 84114
Monday through Friday,
8 a.m. to 5 p.m.