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    "title": "Heezen, Tharp and Ewing: mapping North Atlantic seafloor structure",
    "summary": "The1959 report explains how echo-sounding profiles were organized into a North Atlantic physiographic diagram and provinces, with detailed ridge and axial-valley descriptions.\n\nScattered ship tracks became an interpretable view of a largely inaccessible landscape. The authors distinguish recorded profiles from inferred relief between tracks, state the map's resolution and identify both striking morphology and unresolved geological interpretation.",
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    "area": "Physical ocean-floor mapping",
    "topic": "Earth & space",
    "year": 1959,
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        "description": "The target is the selected physical mapping/morphology contribution in the 1959 report, whose first sheet covers 17–50 degrees north; it is not a complete world-ocean map or every earlier chart. Between-track relief is interpolated/extrapolated and explicitly speculative.40:1 exaggerated profiles and small map scale limit what features are represented; positional/data-quality limits remain. Plate 1 and the figures were not visually audited, and no raw sounding reconstruction was run. Ridge origin remains unresolved in the inspected text; this is not a complete plate-tectonics proof. The three source bylines do not absorb the named expedition, navigation, plotting and recorder-development teams, nor later maps or theories. No life-science observations are curated by this target.",
        "domain": "Physical ocean-floor mapping"
      },
      "sources": [
        {
          "citation": "Heezen, Tharp and Ewing, The Floors of the Oceans: I.The North Atlantic, GSA Special Paper65(1959), selected physical-geoscience text in Gutenberg edition",
          "url": "https://www.gutenberg.org/files/49069/49069-h/49069-h.htm"
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      "statement": "# Heezen, Tharp and Ewing: mapping North Atlantic seafloor structure\n\nThe1959 report explains how echo-sounding profiles were organized into a North Atlantic physiographic diagram and provinces, with detailed ridge and axial-valley descriptions.\n\nScattered ship tracks became an interpretable view of a largely inaccessible landscape. The authors distinguish recorded profiles from inferred relief between tracks, state the map's resolution and identify both striking morphology and unresolved geological interpretation.\n\n## Scientific scope\n\nThe target is the selected physical mapping/morphology contribution in the 1959 report, whose first sheet covers 17–50 degrees north; it is not a complete world-ocean map or every earlier chart. Between-track relief is interpolated/extrapolated and explicitly speculative.40:1 exaggerated profiles and small map scale limit what features are represented; positional/data-quality limits remain. Plate 1 and the figures were not visually audited, and no raw sounding reconstruction was run. Ridge origin remains unresolved in the inspected text; this is not a complete plate-tectonics proof. The three source bylines do not absorb the named expedition, navigation, plotting and recorder-development teams, nor later maps or theories. No life-science observations are curated by this target.\n\n## People and systems\n\nBruce C. Heezen; Marie Tharp; Maurice Ewing\n\n\n\n## Original sources\n\n- [Heezen, Tharp and Ewing, The Floors of the Oceans: I.The North Atlantic, GSA Special Paper65(1959), selected physical-geoscience text in Gutenberg edition](https://www.gutenberg.org/files/49069/49069-h/49069-h.htm)\n- [Project Gutenberg49069 catalogue: The Floors of the Ocean, I.The North Atlantic, three source authors](https://www.gutenberg.org/ebooks/49069)\n",
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      "title": "Heezen, Tharp and Ewing: mapping North Atlantic seafloor structure"
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      {
        "title": "Heezen, Tharp and Ewing, The Floors of the Oceans: I. The North Atlantic, GSA Special Paper 65(1959), selected physical-geoscience text in Gutenberg edition",
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