Credit: NASA/JPL-Caltech
Bridger Basin observations: Mosaic of the Big Sky and Greenhorn drill sites. The Big Sky sample was collected from outside--and the Greenhorn sample from inside--a fracture-associated halo in the Stimson formation. The ChemCam observations of the mean bedrock silica content are indicated by color-coded dots. Dashed lines indicate the approximate centerlines of the fracture-associated halos.