T talus 24 Targhee uplift 83 Teewinot Lake 92 terminal moraine 30 Tetons 8 Teton fault 37 thrust fault 39 timberline 15 titanothere 97 treeline 15 Triceratops 85 trilobites 70 tuff 92 W welded tuff 101 The GRAND TETON NATURAL HISTORY ASSOCIATION The Grand Teton Natural History Association assists the National Park Service in the development of a broad public understanding of the geology, plant and animal life, history, and related subjects pertaining to Grand Teton National Park. It aids in the development of museums and wayside exhibits, offers for sale publications on natural and human history, and cooperates with the Government in the interest of Grand Teton National Park. _Mail orders_: For a publication list, write the Grand Teton Natural History Association, Moose, Wyoming 83012. _Creative Director_: Century III Advertising. Inc. _Designer_: Les Hays Studios, Inc. _Color Separations_—_Assembly_—_Plates_: Orent Graphic Arts, Inc. _Type_: Bodoni and Gothic _Printer_: Omaha Printing Co. _Printing_: Offset Lithography. Six Colors on Covers Two Colors on Body [Illustration: GEOLOGIC MAP OF GRAND TETON NATIONAL PARK] [Illustration: EXPLANATION]