Lobate Flow Features East of Hellas Region

Lobate (or tongue-shaped) flow features such as those seen emanating from the hill at the north end of this image are common in this region east of the Hellas Basin.

These features are considered to be a depositional sink for water ice-rich deposits falling from the atmosphere during periods of high obliquity in the past several million years.

Most of the ice is likely sublimated away, but moraine-like ridges at the flows’ borders are still apparent. The surfaces of these features also have polygonal textures, another signal for the presence of ice just beneath the surface.

Written by: Dan Berman   (17 October 2012)

This is a stereo pair with ESP_029457_1455 .

More info and image formats at http://hirise.lpl.arizona.edu/ESP_029035_1455

Image: NASA/JPL/University of Arizona