Marte Vallis first appears on this map.

This paper is not subject to U.S. copyright. Published in 1982 by the American Geophysical Union.

David H. Scott, Kenneth L. Tanaka 1982 Ignimbrites of Amazonis Planitia Region of Mars. Journal of Geophys. Res. Solid Earth https://doi.org/10.1029/JB087iB02p01179