Medicine Bow Mountains, Wyoming

Huronian glaciation and Paleoproterozoic Earth history, Snowy Pass Supergroup, Wyoming.

Reconaissance trip, led by graduate student Alex Cox.


Paleoprotoerozoic (~2.4 Ga) trough cross-bedding in the Lindsey Quartzite, Medicine Bow Mountains, WY.


Massive diamictite of the Paleoproterozoic (~2.4 Ga) Vagner Formation, Medicine Bow Mountains, WY.


Symmetrical wave ripples atop a thin paraconglomerate bed in the Paleoproterozoic (~2.4 Ga) Rock Knoll Formation on Rock Creek Knoll, Medicine Bow Mountains, WY.


Medicine Bow Peak, composed of Paleoproterozoic (~2.35 Ga) Medicine Peak Quartzite, rises above Lake Mary in the northern Medicine Bow Mountains, WY.


A dark outcrop of “graphitic phyllite” (lightly metamorphosed black shale) in the Paleoproterozoic (~2.05 Ga) Nash Fork formation, Medicine Bow Mountains, WY.


Large stromatolitic bioherms in the Paleoproterozoic (~2.05 Ga) metadolomite of the Nash Fork formation, “valley of the stromatolites”, Medicine Bow Mountains, WY. Ruler is folded at 1m for scale.


A singularly massive stromatolitic bioherm in the Paleoproterozoic (~2.05 Ga) metadolomite of the Nash Fork formation, “valley of the stromatolites”, Medicine Bow Mountains, WY. Ruler is 1.5m for scale.