Yellowstone National Park - Mammoth Cave & Jupiter Terrace - WYOMING:  In Yellowstone National Park, the history of the Mammoth area revolves around the US Army's presence, initially as temporary Camp Sheridan (1886) and later as Fort Yellowstone (1891), which oversaw park management until 1918, when control passed to the National Park Service.   Jupiter Terrace in Yellowstone National Park, part of the Mammoth Hot Springs, is a limestone formation shaped by hot springs depositing travertine, and early tourists began visiting the area when stagecoach lines connected railroad stations to the park in the late 1800s. Jupiter and Mound Terraces display cycles of activity typical of Mammoth Hot Springs, with Mound Terrace being inactive for decades but recently flowing again.  This White Border Era (1915-30) postcard is in good condition.  J. E. Haynes. St. Paul, Minn. No. 23295.