We have long held that the previous administration has abused the Antiquities Act. We even know of a man who was metal detecting on public lands who was cited for finding a square nail and put it on a stump in his camp.
This is a very good article on how that Act has been subverted.
http://freerangereport.com/index.php/2017/06/06/antiquities-act-abuses-are-more-about-power-over-public-lands-than-protection/