Gullies on mars: the debate about formative processes (keynote)

Resumen del trabajo presentado al IV International Symposium on Gully Erosion, celebrado en la Universidad Pública de Navarra del 17 al 19 de septiembre de 2007.The discovery of very young gully systems on Mars has occasioned a lively debate about the processes and materials involved in their formation (Malin and Edgett, 2000). The strong interest in these features results because the majority of the studies have concluded that flowing liquid water has been involved in their formation and the possible implications for past or present microbiotic life on Mars. This paper reviews the occurrence and morphology of the gullies and the range of hypothesis about their formation