Rio Virgin River with Large Rock Formations

Thomas Moran's pen sketch captures the dramatic geology of the Rio Virgin River landscape, rendered in his characteristic linear style. The towering rock formations rise sharply from the valley floor, their stratified surfaces defined by decisive hatching and cross-hatching that conveys both mass and erosion patterns. Moran's field studies from western expeditions informed his monumental studio paintings, but these working drawings reveal his direct observation of geological structure and spatial relationships. The notation at lower left documents the site and conditions. Such sketches were foundational to American landscape art of the period, translating geological specificity into dramatic visual form.