National Geographic : 1931 Jan
Photograph by Capt. A.W. Stevens FURROWLIKE DEPRESSIONS MILES AND MILES LONG RUN PARALLEL WITH CERTAIN BEACHES IN BRAZIL At first, members of the expedition mistook these oddly scarified areas for abandoned sugar fields, as marked bysteam plows ortractors. Actually, through the centuries, the pounding sea made these ditches and ridges as it added this area to the continent.Ledges out at seakeep steamers far from shore. Few men indeed ever observed this phenomenon north of Victoria, Brazil, for it is noticeable onlyfrom the air.