In Talkeetna Mountains, flowing NNW to Limestone Gulch 1.3 mi SSW of Limestone Gap, 15 NW of Tahneta Pass, and 93 mi NE of Anchorage, Talkeetna Mts. 1 mile long.
Name in 1964 by U.S. Geological Survey (USGS) derived from an important ammonite (fossil mollusk) locality at the head of the creek.
Horn Mountain, Sheep Mountain, Syncline Mountain,
Mountain Passes:Horsepasture Pass, Limestone Gap,
Mountain Ranges:Ridges:Streams:Alfred Creek, Ammonite Creek, Bench Creek, Billy Creek, Bitter Creek, Cadoceras Creek, Cardiceras Creek, Cardioceras Creek, Chitna Creek, Conglomerate Creek, Divide Creek, Flume Creek, Fortress Creek, Glass Creek, Greta Creek, Horsepasture Creek, Inoceramus Creek, Landslide Creek, Mazuma Creek, Mouse Creek, Nowhere Creek, Papoose Creek, Roaring Creek, Sawmill Creek, Sawmill Creek, Sheep Creek, Sladen Creek, Squaw Creek, Whistler Creek, Wood Creek,
Valleys: