officially established on October 8, 1975. The Cant Ranch House and associated land and outbuildings were listed on the National Register of Historic Places as the James Cant Ranch Historic District in 1984. After the monument opened in 1975, the ranch house served as headquarters for all three units. In 2005, the lower floor of the ranch house was opened to the public; it features exhibits about the cultural history of the region. The Thomas Condon Paleontology Center, a $7.5 million museum and visitor center at the Sheep Rock Unit, also opened in 2005. Among the center's offerings are displays of fossils, murals depicting life in the basin during eight geologic times ranging from about 45 million to about 5 million years ago, and views of the paleontology laboratory. In March 2011, the Park Service installed two webcams at the Sheep Rock Unit. Both transmit continuous real-time images; one shows the paleontology lab at the Condon Center and the other depicts Sheep Rock and nearby features. In June 2011, work was finished on a new ranger residence in the Painted Hills Unit that makes the unit almost carbon-neutral. Solar panels generate enough electricity to power the house as well as the ranger's electric vehicle, on loan from its manufacturer for a year. The project is part of ongoing efforts to make the whole park carbon-neutral. Geology and paleontology The John Day Fossil Beds National Monument lies within the Blue Mountains physiographic province, which originated during the late Jurassic and early Cretaceous, about 118 to 93 million years ago. Northeastern Oregon was assembled in large blocks (exotic terranes) of Permian, Triassic, and Jurassic rock shifted by tectonic forces and accreted to what was then the western edge of the North American continent, near the Idaho border. By the beginning of the Cenozoic era, 66 million years ago, the Blue Mountains province was uplifting (that is, was being pushed higher by tectonic forces), and the Pacific Ocean shoreline, formerly near Idaho, had shifted to the west. Volcanic eruptions about 44 million years ago during the Eocene deposited lavas accompanied by debris flows (lahars) atop the older rocks in the western part of the province. Containing fragments of shale, siltstone, conglomerates, and breccias, the debris flows entombed plants and animals caught in their paths; the remnants of these ancient flows comprise the rock formations exposed in the Clarno Unit. Preserved in the Clarno