Lower Greasewood Creek
Location: Rio BlancoSize: 200 acresDesignated: March 1988Land 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.