Seven conservation groups plan to sue the Bureau of Land Management for making more than 1,200 square miles available for potential oil shale and tar sands leasing in Colorado, Utah and Wyoming.
The Grand Junction Daily Sentinel reported Wednesday a formal lawsuit notice was filed last week.
It claims the BLM failed to comply with the Endangered Species Act by not formally consulting with the Fish and Wildlife Service.
It claims the BLM acknowledges the decision could affect the Colorado pikeminnow, Mexican spotted owl and other threatened or endangered species.
BLM spokesman Steven Hall said he hadn't seen the notice.
Filing the notice were the Grand Canyon Trust, Living Rivers, Southern Utah Wilderness Alliance, Rocky Mountain Wild, Biodiversity Conservation Alliance, the Center for Biological Diversity and the Sierra Club.