The Fenambosy Chevron is one of four chevron-shaped land features on the southwest coast of Madagascar, near the tip of Madagascar, 180 metres high and 5 km inland. Chevrons such as Fenambosy have been hypothesized as providing evidence of "megatsunamis" caused by comets or asteroids crashing into Earth. However, the megatsunami origin of the Fernambosy and other chevrons has been challenged. About 900 miles southeast from the Madagascar chevrons, in deep ocean, is Burckle crater, which Dallas Abbott discovered in 2005. Although its sediments have not been directly sampled, cores from the area contain high levels of nickel and magnetic components associated with impact ejecta. Burckle crater has not been dated, but Abbott estimates that it is 4,500 to 5,000 years old.
- Bourgeois, J. and Weiss, R., 2009, "Chevrons" are not mega-tsunami deposits--A sedimentologic assessment, Geology, v. 37, pp. 403–406>
- Burckle Abyssal Impact Crater: Did this Impact Produce a Global Deluge? (online abstract)
- Sandra Blakeslee (14 November 2006). "Ancient Crash, Epic Wave". The New York Times. Retrieved 2009-04-05.
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