In this issue:
- Preliminary report on the Precambrian stromatolites in the Nash Formation, Medicine Bow Mountains, Wyoming
- Structural analysis of the Precambrian rocks southeast of Encampment, Wyoming
- Pliocene vulcanism, southern Absaroka Mountains, Wyoming
- Petrography of Precambrian rocks from a 3.05-kilometer-deep borehole, Wind River Mountains, Wyoming
- A Fortran IV program for the determination of rotation axes from fabric data
- Lamination deformed by burrowers in Flathead Sandstone (Middle Cambrian) of central Wyoming
- Preliminary gravity study of the southern Laramie Mountains; anorthosite areas and adjacent basins
- The interpretation of folded transposition layering near Twin Mountains, Laramie Range, Wyoming
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