bathymetric globe

The always interesting Map Room directs our attention to a centenary celebration of the pioneering cartographer and oceanographer Marie Tharp (*1920 – †2006) whose contributions mapped the Atlantic floor (see also), revealing detailed topography and landscape features no one suspected. Her discovery of rift valleys on the bed of the ocean caused a rather seismic shift in the accepted understanding of geography and earth sciences and convinced colleagues to acknowledge the relatively new theories of continental drift and plate tectonics. Much more to explore at the source and with Columbia University at the links above.