Curiosity's 32 Drill Holes – NASA Mars Exploration
NASA’s Curiosity Mars rover has used the drill on its robotic arm to take 32 rock samples to date. The Mars Hand Lens Imager (MAHLI), a camera on the end of the robotic arm, provided the images in this mosaic.
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Are they drilling into very different types of rock or is this area (the basin) fairly homogenous?
The debris and surrounding rock looks likes it's a few different colors, so I'd guess it's different types of rock.