Eroded Crater Ejecta

Two craters in Arabia Terra, in the old cratered highlands, are surrounded by many small mesas. The two craters are partially shown in the central-left and extreme upper-right of the image. These mesas are remnants of ejecta blankets of debris that were cast out when the impact craters originally formed. These former ejecta blankets formed a material resistant to weathering, and so they remain on the surface as mesas, while the surrounding terrain has been stripped away.