Fig. 1: Red Stone location and geological characteristics.
From: Dark microbiome and extremely low organics in Atacama fossil delta unveil Mars life detection limits
A Red Stone Location in the Atacama Desert (digital terrain model86). B Satellite image zooming in the surrounding region (Sentinel 2020 satellite data). C Paleogeographic reconstruction of the alluvial/delta system shown in B, according to the reported sedimentary record of the Caleta Coloso-El Way formation (modified from Flint, S. Clemmey, H. & Turner, P. The Lower Cretaceous Way Group of northern Chile: an alluvial fan–fan delta complex Sediment. Geology 46, 1-22 (1986)25,87). The black arrows in C show the direction of the flow of the ancient river delta, which point of origin is now under the Pacific Ocean. The red point in A, B and C shows the location of the outcrop shown in E. D Stratigraphic column of the outcrop studied shown in panel E. Red arrows show sample collection points. E Close-up view of the studied outcrop. From top to bottom: UZ upper zone, U1 Unit 1, WI wall in sensor location, U2 Unit 2, WO wall out sensor location, LZ lower zone.
