chalk cliffs near geraldine, montana, with sagebrush and prairie grass in the foreground

montana arid autumn backcountry big sky country blue chalk cliffs color dried ecosystem environment fall geologic feature geology geraldine grass habitat landscape natural beauty light nature people open land outdoors outside photograph prairie pristing ranch rangeland sage sagebrush scenic secluded sunlight sunlit undeveloped unspoiled valley vast vegetation vista white wideopen spaces foreground cloudless