The mode of formation of gullies on Mars, very young erosional–depositional landforms consisting of an alcove, channel, and fan, is one of the most enigmatic problems in martian geomorphology. Major questions center on their ages, geographic and stratigraphic associations, relation to recent ice ages, and, if formed by flowing water, the sources of the water to cause the observed erosion/deposi...

We report on a decade of fieldwork designed to determine the conditions required for erosion of Mars-like gully channels in the McMurdo Dry Valleys (MDV) of Antarctica. We have outlined the major factors in the morphological evolution of gullies in the Inland Mixed Zone of the MDV: (1) the distribution of ice sources; (2) the temporal aspects of ice melting; and (3) the relative significance of...

Depositional and erosional bedforms that shape prodelta deposits in the Gulf of Patti (southern Tyrrhenian Sea) Al-Hoceima Bay (northern Morocco) were investigated using multibeam bathymetry as a basis for morphometric analysis. The two study areas have comparable structural settings oceanographic regimes share occurrence sediment undulations closely spaced gullies. resulting bedform fields are...

Introduction: Malin and Edgett [1,2] initially described a class of young features on Mars that they termed gullies, consisting of an alcove, a channel and a fan. Restricted to middle and high latitude locations, these features were interpreted to have originated through processes related to the presence of liquid water (through groundwater discharge); the potential presence of liquid water on ...

Introduction: The latitude-dependent distribution [1-4] and non-uniform orientation [5-9] of gullies on Mars indicate that their formation is controlled by climate conditions at the surface within the last million years [10-11], while their global distribution [2,4] and morphology [12-13] show direct correlations with the ice-rich Latitude Dependent Mantle (LDM), a potential source for melting....

Thermal contraction crack polygons modify the generation, transport, and storage of water in Wright Valley gullies. Water generation is contributed to by trapping of windblown snow in polygon troughs. Water transport is modified by changes to the ice-cement table and active layer topography caused by polygon trough formation. Water storage is modified by sediment grain-size distribution within ...

Badlands are extensively eroded landscapes consisting of weakly consolidated deposits within highly dense drainage systems. Their controlling and shaping factors can differ in relation to various internal external conditions processes that not always well understood. This study focuses on the development a badland landscape affecting Miocene Quaternary sand-clay sediments extensional tectonic r...

a r t i c l e i n f o The distribution and morphological characteristics of channels were mapped in a redwood forest at Caspar Creek, California, USA, to evaluate the extent to which recent logging has influenced channel conditions in the area. In the North Fork Caspar Creek watershed, second-cycle logging of the early 1990s appears to have triggered increased coalescence of discontinuous gulli...