What is the Origin of Carbonate Rich Chevron Dunes in Southern Madagascar?

Dallas H Abbott, Lamont -Doherty Earth Observatory, Palisades, United States, Viacheslav K Gusiakov, Institute of Computational Mathematics and Mathematical Geophysics, Novosibirsk, Russia, Gérard Rambolamanana, Institute and Observatory of Geophysics Antananarivo-University of Antananarivo, Physics, Antananarivo, Madagascar, Karina Galinskaya, Brooklyn College, New York, United States, Andriamiranto Raveloson, Penn State, State College, PA, United States and Dee L Breger, Micrographic arts, Saratoga Springs, NY, United States