Extended Data Fig. 4: Overhead perspective of karst-void ceiling breached during trenching.
From: Abrupt Southern Great Plains thunderstorm shifts linked to glacial climate variability
Note abundant fracture sets (white arrows), permitting recharge from any rainfall sufficient to exceed surface alluvium storage capacity and evapotranspiration. Voids breached and surveyed maintained 100% relative humidity and actively dripping groundwater infiltration.
