You can see next to it an intriguing linear feature called a «slump,» where a mass of material has dropped below the surface. (scientificamerican.com)
But plotting shell shape reveals patterns and captures aspects like curvature — things that are hard to measure in just a single linear feature. (sciencedaily.com)
They also display long linear features and a varied topography of rough areas and one smooth region — «everything a geologist would love», Yeomans said. (newscientist.com)