Remnants of Eocene rocks along the modern Teton Range date the final uplift and subsidence of the ancestral Teton-Targhee arch, and determine direction of Eocene drainage.

Remnant of Eocene rocks along the modern Teton Range date the final uplift and subsidence of the ancestral Teton-Targhee arch, and determine direction of Eocene drainage.

Our study is concerned primarily with three intrusive porphyritic dacite plugs belonging to the calc-alkalic suite of the Western Absaroka belt.