For those not familiar with US heritage protection laws, archaeology resources on private lands are not usually protected by laws. There are some local laws offering protection for graves but that is about it.
A website has been created to help facilitate the protection of archaeological sites on private lands. Some of the information is valuable for those outside of the US.
The development of this web site was a collaborative effort of two National
Park Service Cultural Resource programs (Heritage Preservation Services and
Archeology Program), The Archaeological Conservancy, the Society for
American Archaeology, the Society for Historical Archaeology, the National
Trust for Historic Preservation, and the National Conference of State
Historic Preservation Officers.