The physical demands of large-format landscape work were great. Since there was as yet no practical means of enlarging, the glass negatives had to be as large as the photographer wished the prints to be, and the camera had to be large enough to accommodate the plates. Jackson's photographs of Yellowstone National Park were instrumental in bringing the geological curiosities of the region to the public's attention. The amazing mineral formations of Mammoth Hot Springs soon became as legendary as Old Faithful.
Inscription: Inscribed in the negative, BLC: "1091. MAMMOTH HOT SPRINGS. PULPIT TERRACES"; BRC: "W. H. JACKSON, Co., DENVER, COL."