Sol 5013 MAHLI image (using the microscopic imager at the end of Curiosity's arm, FOV ~20 cm across).

For wider context:

Fortunately, those small linear flakes in the colour MAHLI image are not sandworm larvae or anything so disgusting. I haven't the faintest idea about the detailed geologic process represented here, alas. All I know is that this portion of the mountain features a lot of beauty granted us by erosion: