Big Horn, Tongue River

Thomas Moran's field sketch captures a geological formation along the Tongue River in Wyoming. The drawing employs rapid pen and ink notation to record the striated limestone bluff at the composition's center, with surrounding landscape rendered in lighter linear marks suggesting terrain and vegetation. Moran was documenting the American West during an era when such expeditionary sketches served both artistic and scientific purposes. The abbreviated notation style—characteristic of working drawings—reveals the artist's practiced eye for essential forms and geological structure. This sketch exemplifies the visual vocabulary landscape artists developed for capturing dramatic western topography in the field.