Mega-streamlined landforms on Earth and Mars have been attributed to aeolian,
glaciogenic, fluvial, and tectonic processes. Identifying the forces that shaped these …

The Ordovician glaciation represents the acme of one of only three major icehouse periods
in Earth's Phanerozoic history and is notorious for setting the scene for one of the “big five” …

Geological evidence indicates that the Sahara was glaciated by a large ice sheet c. 440 Ma
ago. Two end-member theories have been proposed for the large-scale configuration of this …

Valley networks are some of the strongest lines of evidence for extensive fluvial activity on
early (Noachian;> 3.7 Ga) Mars. However, their purported absence on certain ancient …

Fluvial and lacustrine processes were abundant on early Mars. However, key questions
remain about the extent of these processes and the climate in which they formed. This thesis …

A major debate in Mars science is the nature of the early Mars climate, and the availability of
precipitation and runoff. Observations of relict erosional valley networks have been …

Fieldwork at the flanks of Al Kufrah Basin, Libya, reveals that Late Ordovician ice sheets
were present in the eastern Sahara and that they extended northeastward toward Egypt …

A widely hypothesized but complex transition from widespread fluvial activity to
predominantly aeolian processes is inferred on Mars based on remote sensing data …

Ancient lacustrine and aeolian sediments have been separately identified in a variety of
locations on Mars. In this work, we interpret the depositional history of Barth crater and its …

Branching to sinuous ridges systems, hundreds of kilometers in length and comprising
layered strata, are present across much of Arabia Terra, Mars. These ridges are interpreted …