Introduction: Aeolian sediments commonly are well sorted, but aeolian megaripples are exceptions, having bimodal grain size-frequencies. Distinguishing aeolian megaripple deposits from mixed grain size fluvial deposits is important for martian sedimentary rocks, because indicators of flowing water in the martian past (if revealed by legitimate fluvial deposits) are mission drivers for rovers an...

To develop empirical bases for the numerical treatment, I have: 1) conducted fieldwork (described below) involving eolian bedforms, with Philippe Claudin, Bruno Andreotti, Olivier Pouliquen, and Rebecca Hoyle; 2) begun a collaboration involving separate observations of subaqueous ripple evolution and sorted-bedform changes with Giovanni Coco and Malcolm Green; and 3) begun a collaboration to me...

Raymond E. Arvidson McDonnell Center for the Space Sciences, Department of Earth and Planetary Sciences, Washington University in St. Louis, St. Louis, Missouri 63130 e-mail: [email protected] Karl D. Iagnemma Robotic Mobility Group, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 e-mail: [email protected] Mark Maimone California Institute of Technology/ Jet Propulsion L...

Biogenic reefs form biodiversity hotspots and are key components of marine ecosystems, making them priority habitats for nature conservation. However, the conservation status biogenic generally depends on their size stability. Dynamic, patchy may therefore be excluded from protection. Here, we studied epibenthos epifauna density, richness, community composition patchy, dynamic Sabellaria spinul...