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Book & Research > Solstice Project Papers

Inter-site Alignments of Prehistoric Shrines in Chaco Canyon to the Major Lunar Standstill

by Anna Sofaer, Robert Weiner, and William Stone. 2017. In The Science of Time 2016: Time in Astronomy & Society, Past, Present and Future, edited by E. Arias, L. Combrinck, et al, pp. 79-102. Astrophysics and Space Science Proceedings 50. Springer, Cham.

Media > 2017



Media > 2018

Sundagger Colorimagebullfrog

Sundagger Colorimagebullfrog

News & Events > Archive

BLM at it Again! Act Fast to Save Chaco Region!


Despite the cancellation of a 4,434-acre lease of oil and gas parcels north of Chaco Canyon, Secretary Zinke and the BLM continue an assault on the cultural resources of ancient America throughout the Four Corners states. Tomorrow, on March 20, the BLM will proceed with a lease of 41,000 acres in southeastern Utah in an area rich with archaeological sites.
At least 10 Chaco Great Houses are within 2 miles of these parcels, including at least two Great House sites within the new lease boundaries. In addition, at least 4 prehistoric road segments are adjacent to or within the parcels.


There are also countless archaeological sites and rock art panels spanning thousands of years in and near the leases. In the words of Jim Allison, a professor at Brigham Young University, “There are so many sites [in the area], it would take an army of archaeologists decades to map them… they shouldn’t do oil and gas extraction there.” Make your voice heard and stand up against further attacks on these invaluable traces of America’s indigenous history!

Call or e-mail Secretary Zinke at

(202) 208-7351,

and Utah BLM State Director Ed Roberson at

(801) 539-4010,



News & Events > Current

Chaco’s Protection Wins a Few Gains!

Interior Secretary David Bernhardt issued a moratorium on oil and gas leasing within a 10-mile radius of New Mexico's Chaco Culture National Historical Park for at least a year after touring the park last week with Sen. Martin Heinrich (D-N.M.)! In the meantime, Heinrich and Udall’s legislation to permanently protect federal lands inside this same 10-mile buffer zone is working through the Senate, while a companion bill works through the House.

For Senator Heinrich’s press release, see here.

Last month, the 10th Circuit Court reversed or suspended hundreds of leases for oil and gas drilling in the nearby Chaco Canyon region, which is another gain for its protection. However the BLM had been approving thousands of leases without assessing their cumulative impact as required by law, so we need to continue our vigilance to protect Chaco and require the BLM’s leasing plan for public review.