In the Terra Cotta Mountains, trends SE to a tributary valley of the South Fork Kuskokwim River, 2 mi NE of Post Lake.
Named for the abundance of graptolite fossils found at the head of the canyon.
Barren Ridge, Terra Cotta Mountains, Tunis Mountain,
Rivers:Streams:Bear Creek, Brush Creek, Dalzell Creek, Denny Creek, Lynx Creek, Wolverine Creek,
Valleys:Cities:Rohn,