Distribution of coastal morphology in the Martian northern lowlands

The northern plains of Mars exhibit boundary morphologies that were interpreted as shorelines of a sea that formed as a result of flooding from the major outflow channel along the periphery of the lowlands. Earlier work focused on a morphologic description based on the very high resolution images available in the west Deuteronilus Mensae region where these boundaries and their relationships to pre-existing features could be most readily characterized. Here, we wish to describe the criteria used in the earlier identification.