Not all rocks on Mars are basalts. Last month’s NASA pictures show familiar ripple marks, made of sand blown recently, and whose shape and position are changing.
These images are very like the wind-formed ripples so familiar on earthly sand dunes.
http://www.livepaintinglessons.com gives detail of Evening Light, Bream Bay, inspired by the local sand dunes of Ruakaka, New Zealand:
More information from the Richard Robinson Gallery, 14 Surfside Lane, Ruakaka 0116, Northland, New Zealand.