Geologic setting and organic architecture of Fallingwater, Frank Lloyd Wright’s masterpiece

A new geological interpretation reveals that Fallingwater, Frank Lloyd Wright’s iconic organic architecture, is intricately linked to the local Pennsylvanian bedrock. The study identifies the Fallingwater sandstone member within the Pottsville Formation as a distinct unit deposited in shoreface or tidal flat environments, characterized by trace fossils and ripple marks. It demonstrates that natural fractures in the bedrock influenced the orientation of Bear Run and the waterfalls' edges, while synclinal thickening suggests Alleghanian deformation shaped its deposition. The research proposes that Fallingwater’s building stone was quarried from a 2-meter-thick zone near the house, with its architecture harmonizing with the three-dimensional landscape of the valley, stream, and waterfall.

Zelt, F., Shaulis, J., & Wach, G. (2023). Geologic setting and organic architecture of Fallingwater, Frank Lloyd Wright’s masterpiece. Field Excursions to the Appalachian Plateaus and the Valley and Ridge for GSA Connects 2023, 29–78. https://doi.org/10.1130/2023.0066(02)