The north edge of the national monument is approximately opposite Lee Canyon Road towards Mount Charleston, and it borders both Nellis Air Force Base and the Desert National Wildlife Refuge; this latter preserve also forms most of the eastern boundary. From here, the monument extends southeast towards Las Vegas and then east, becoming narrower, and ending approximately by the junction of Losee Road with Bruce Woodway Beltway; this is a possible access point though the nearest usual entrance is one mile west, at the 5th Street
intersection. Further west, other approaches include Grand Teton Drive and the linked Aliante Parkway
, Decatur Boulevard
(which crosses a narrow part of the monument and ends at a shooting complex), and Durango Drive
, probably the most used entrance. This passes the oasis of Floyd Lamb Park and ends soon after at an intersection with Moccasin Road, where a parking area has been constructed, and two semi-official trails loop over the mud hills and washes to the north. One other access route is in the northwest, along Corn Creek Road
which leads to a group of springs, and links with several lesser tracks that penetrate deeper into the monument.
Fossils unearthed within the monument range greatly in age, from 250,000 to 7,000 years. One of the major excavation sites is near Decatur Boulevard, where a group of trenches, some up to one mile long, are evidence of the 'Big Dig
' of 1962. Other fossil-rich places are subject to ongoing paleontological research, and can be visited by prior arrangement with the Protectors of Tule Springs, a local volunteer group. Unfortunately the areas close to the city are also affected by litter, though the NPS will be carrying out cleaning operations.