Atlantic Ocean floor—Physiographic diagram—Bruce Heezen & Marie Tharp 1957 map
£2,260
SKU: P-7-028454
'Physiographic Diagram Atlantic Ocean (Sheet 1)'
A landmark three-colour map—the first comprehensive map of any ocean basin—of the North Atlantic between 17° and 50° north. Compiled by Bruce C. Heezen and Marie Tharp from continuous echo-sounding traverses, pictorial hachuring and 20:1 vertical exaggeration reveal continental shelves, abyssal plains, seamounts and the Mid-Atlantic Ridge. Tharp’s recognition of its axial rift valley, corroborated by earthquake epicentres, supplied influential evidence for continental drift and emerging plate tectonics. This is the map’s first full publication, retaining the September 1957 Bell System Technical Journal with which it was issued. The accompanying article, “Oceanographic Information for Engineering Submarine Cable Systems,” explains the immediate practical context: seabed relief, sediments, slopes and hazards informed cable design, route selection, laying and repair. Its appearance here reflects Bell Labs’ involvement in the survey challenges surrounding TAT-1, the first transatlantic telephone cable.
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