In the Talkeetna Mountains, extends SW i mi. from Belanger Pass, between Alfred and Squaw Creeks, 55 mi. NE of Palmer, 95 mi NE of Anchorage.
Named in 1956 by U.S. Geological Survey (USGS) because it is composed entirely of bedded rocks folded into a large syncline.
Hide and Seek, Lil' Kahuna, Little Spoon,
Lakes:Bug Lake, Knob Lake, Lake Leila, North Knob Lake, South Lake, Squaw Lake, Trail Lake,
Mountains:Gunsight Mountain, Horn Mountain, Knob Hill, Lion Head, Sheep Mountain, Syncline Mountain, Table Mountain, White Hill, Mount Wickersham,
Mountain Passes:Belanger Pass, Cameron Pass, Horsepasture Pass, Limestone Gap, Tahneta Pass,
Mountain Ranges:Horn Mountains, Limestone Hills,
Ridges:Fortress Ridge, Wall of China,
Rivers:East Fork Matanuska River, South Fork Matanuska River,
Streams:Alfred Creek, Ammonite Creek, Bench Creek, Bitter Creek, Bubb Creek, Cadoceras Creek, Camp Creek, Cardiceras Creek, Cardioceras Creek, Caribou Creek, Dan Creek, Dick Creek, Divide Creek, Flat Creek, Flume Creek, Fortress Creek, Glacial Fan Creek, Greta Creek, Gunsight Creek, Gypsum Creek, Inoceramus Creek, McDougall Creek, Mead Creek, Meyer Creek, Middle Creek, Mouse Creek, Papoose Creek, Pass Creek, Placer Creek, Rock Glacier Creek, Sawmill Creek, Sawmill Creek, Sheep Creek, Shovel Creek, Sladen Creek, Squaw Creek, Trail Creek, West End Creek, Wood Creek, Yellow Jacket Creek,
Valleys:Dave Gulch, Jackass Canyon, Limestone Gulch, Money Gulch, Noon Gulch, Porphyry Gulch,