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Erosion- resistant Polygonal Ridges Latitude/longitude: -4.80 North, 137.38 East Rationale: These features are widespread in Gale crater and may be cemented or altered fractures or fracture fill. Morphology and Mineralogy: Polygonal positive-relief erosion-resistant ridges occurring in the sulfate- bearing, yardang-forming portion of the mound. What will the rover specifically do here? Determine whether the ridges are erosion-resistant fractures and study their composition to learn more about the post- depositional environment at Gale. Next Slide
