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Stop 8 at Hellas

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Colorized shaded-relief perspective view of lobate debris aprons near Reull Vallis in the eastern Hellas region
Colorized shaded-relief perspective view of lobate debris aprons near Reull Vallis in the eastern Hellas region
Image: Color-coded elevation draped over perspective shaded-relief imagery from the Mars Orbiter Laser Altimeter
Location: Near 103° E, 41° S on the inner rim of Hellas
Scale: View is approximately 200 kilometers across; Vertical exaggeration is 5X

Above is a perspective view of high-relief massifs and surrounding debris aprons (see stop 7 for definition of a lobate debris apron) along the inner rim of Hellas near Reull Vallis, a complex fluvial valley system. The eastern portion of Hellas has an abundance of geologic features that are indicative of ice incorporated into the surface material, of which debris aprons are the most prominent in terms of scale. In the Hellas region, debris aprons extend up to several kilometers from canyon walls, steep massifs, and even below impact crater walls. They have thicknesses typically in the range of tens to hundreds of meters with lobate margins. In some cases, the margins of several individual aprons can be seen in higher-resolution images and together, these aprons form an apron "complex" in which they move downslope as a single mass. Below is another perspective view of the aprons from a different angle.

Perspective view of lobate debris aprons near Reull Vallis in the eastern Hellas region
Perspective view of lobate debris aprons near Reull Vallis in the eastern Hellas region
Image: Perspective shaded-relief imagery from the Mars Orbiter Laser Altimeter
Location: Near 103° E, 41° S on the inner rim of Hellas
Scale: View is approximately 100 kilometers across; Vertical exaggeration is 5X

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