West Antarctica (2637 – 910 BCE): Fragmented …

Years: 2637BCE - 910BCE

West Antarctica (2637 – 910 BCE): Fragmented Ice Lands and Coastal Wildlife Havens

Geographic and Environmental Context

West Antarctica—including the Antarctic Peninsula, the Amundsen Sea and Bellingshausen Sea sectors, the scattered coastal ice shelves of Marie Byrd Land, and Peter I Island—was geologically distinct from East Antarctica. Instead of a single massive plateau, it consisted of smaller, lower-elevation ice domes separated by deep marine basins. Much of its bedrock lay below sea level, making it vulnerable to ice retreat during warmer intervals.
Peter I Island, a small volcanic landmass in the Bellingshausen Sea about 450 km off the Antarctic coast, rose from the Southern Ocean as an ice-clad, sheer-sided fortress of rock and glacier. Like the Antarctic Peninsula, it represented one of the few places in West Antarctica where rocky terrain broke through the ice sheet.

Climate and Environmental Conditions

The Antarctic Peninsula had the mildest climate on the mainland, with summer temperatures occasionally reaching above freezing in sheltered coastal sites. The surrounding seas experienced seasonal sea ice retreat, creating biologically rich ice edges and open-water areas (polynyas). Farther south, the Amundsen and Bellingshausen coasts remained locked in heavier pack ice for much of the year.
Peter I Island, isolated and surrounded by pack ice, endured similar conditions to the Bellingshausen coast—persistent cold, high winds, and short summer thaws exposing limited ice-free ground.

Biological Productivity

Although inhospitable to terrestrial vegetation beyond mosses and lichens, the West Antarctic coasts and nearby islands supported intense summer bursts of life:

  • Penguins – Adélie and gentoo colonies nested on ice-free slopes of the Antarctic Peninsula and surrounding islands.

  • Seals – Weddell, crabeater, and leopard seals hauled out on sea ice and beaches.

  • Seabirds – Petrels, skuas, and sheathbills foraged widely, with some nesting on rocky headlands.
    Peter I Island, though small, provided seasonal rookeries for seabirds and occasional haul-out spots for seals.

Human Presence

During 2637 – 910 BCE, West Antarctica, including Peter I Island, was completely beyond human reach. The region’s remoteness from inhabited lands, the barrier of the Drake Passage, and the formidable pack ice made access impossible for the maritime technology of the time. Even the closest human populations in southern South America and the subantarctic islands could not approach or survive in these polar conditions.

Symbolic and Conceptual Absence

These lands lay outside the mental maps of all ancient peoples, existing only as an unseen and unimagined realm. If the northern tip of the Antarctic Peninsula was ever glimpsed from distant southern waters, it would have appeared as a remote, cloud-shrouded mountain range with no obvious signs of life or landfall.

Environmental Adaptation of Local Life

Wildlife here was adapted to the extreme cold and seasonal food booms: penguins bred during the short summer to raise chicks before the onset of winter darkness, seals synchronized pupping with peak prey availability, and seabirds timed migrations to match the productivity of Antarctic waters.

Transition to the Early First Millennium BCE

By 910 BCE, West Antarctica remained a frozen and isolated domain, unvisited by humans but vital to marine ecosystems. Its scattered rocky outcrops—like Peter I Island—and productive summer coastlines were important ecological nodes in the Southern Ocean, long before human exploration reached these latitudes.

Subjects
Regions
Subregions

Related Events

Filter results