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Piece of Africa Found Under Alabama

A quarter of a billion years ago Africa slammed into North America and left a scar that can be seen today with special instruments.

April 22, 2014
10:50 AM EDT
This is an aeromagnetic map of the eastern margin of North America showing, among other things, Brunswick magnetic anomaly (BMA) and East Coast magnetic anomaly (ECMA). | Map modified from Tréhu et al., 1989; Austin et al., 1990; Sheridan et al., 1993; Lizarralde et al., 1994; North American Magnetic Anomaly Group, 2002; Bartholomew and Hatcher, 2010.