Lower Greasewood Creek 

Location:    Rio Blanco
Size:   200 acres
Designated:   March 1988
Land Manager:   The Bureau of Land Management

Lower Greaswood Creek Natural Area includes a relatively undisturbed example of  piñon-juniper woodland.  The area also supports significant populations of the Uinta gilia (Gilia stenothyrsa), which is endemic to the soils formed from the Green River and Uinta formations.  Endemic species are those which are restricted to a particular area or narrow habitat type.  Shale formations such as the Green River often support plant species which are uniquely adapted to the particular chemistry of the shale derived soils.