Pacific coastal migration: maritime routes and archaeological/paleoecological records (c. 18,000–8,000 BP)

  1. Beringia widens during Last Glacial Maximum

    Labels: Beringia, Last Glacial

    During the cold peak of the Last Glacial Maximum, sea level fell and exposed the Bering Land Bridge (Beringia) between Siberia and Alaska. This created a broad land-and-coast zone that could support plants and animals and potentially provided staging areas for human movement along the North Pacific rim. The Pacific coastal route becomes especially important because large ice sheets still blocked much of the interior of North America.

  2. Coastal refugia likely persist on northwest coast

    Labels: Coastal refugia, Northwest Coast

    Even while continental ice sheets covered much of coastal Alaska and Canada, some parts of the coast and islands are thought to have remained partly ice-free at times (often called coastal "refugia"). These locations matter because they could have offered habitable pockets and travel corridors for small groups using boats and shoreline resources. This idea is supported by ongoing work that combines archaeology, geology, and paleoecology to reconstruct where land and resources were available.

  3. Cooper’s Ferry shows early inland presence before corridor

    Labels: Cooper s, Idaho

    At Cooper’s Ferry in western Idaho, dated occupations begin roughly between 16,560 and 15,280 calibrated years before present. The researchers argue this timing predates the opening of the interior ice-free corridor, which supports migration models that reach the interior from the Pacific coast via river systems. It also shows that a coastal-route scenario can still lead to early inland sites relatively quickly.

  4. Monte Verde II confirms early people in southern Chile

    Labels: Monte Verde, Chile

    Monte Verde II in southern Chile provides widely cited evidence for human presence well before the Clovis period. Its age implies that people reached far into the Americas earlier than older "Clovis-first" models allowed. That early timing increases interest in coastal travel, because an interior ice-free corridor was not yet a practical route for the earliest movements south.

  5. Paisley Caves coprolites support pre-Clovis presence

    Labels: Paisley Caves, Oregon

    At Paisley Caves in Oregon, directly dated coprolites (preserved feces) provide evidence that people were in western North America before Clovis. Later work addressed concerns about contamination and strengthened the case that at least some of the coprolites are truly human and genuinely ancient. These findings fit a broader pattern in which early sites appear in many regions, not only along an interior route.

  6. Triquet Island hearth suggests early coastal settlement

    Labels: Triquet Island, British Columbia

    On Triquet Island (British Columbia), radiocarbon-dated charcoal from an ancient hearth indicates human activity around 14,000 years ago. The site is important because it lies on the coast, where food resources and marine travel could support early settlement. It also illustrates why archaeology on today’s shoreline may capture only part of the story, since many older coastal areas were later flooded.

  7. Manis site indicates pre-Clovis hunting in Pacific Northwest

    Labels: Manis site, Washington

    At the Manis Mastodon site in Washington, a bone projectile point embedded in a mastodon rib is dated to roughly 13,800 years ago. This suggests people in the Pacific Northwest used sophisticated hunting tools before the classic Clovis toolkit became widespread. The site helps show that early life along the Pacific side of North America was diverse and not limited to one technology or pathway.

  8. Channel Islands remains support early seafaring capability

    Labels: Channel Islands, Arlington Springs

    Human remains known as Arlington Springs Man on Santa Rosa Island (California Channel Islands) date to about 13,000 years ago. Because reaching the islands required watercraft, the find supports the idea that early people along the Pacific margin could travel by sea. Island evidence also matters because coastal archaeology is often missing on the mainland where shorelines have shifted since the last ice age.

  9. Ice-free corridor opens but is initially not biologically viable

    Labels: Ice-free corridor, Paleoecology

    As the continental ice sheets retreated, a north–south passage (the ice-free corridor) formed between them. Paleoecological evidence from lake sediments indicates that although an open corridor existed earlier, it did not become a productive habitat suitable for sustained travel until later. This helps explain why some of the earliest sites south of the ice sheets are difficult to reconcile with an interior-only first migration.

  10. On Your Knees Cave shows marine-based diet in Southeast Alaska

    Labels: On Your, Prince of

    Human remains from On Your Knees Cave on Prince of Wales Island, Alaska, date to about 10,300 years before present. Isotopic evidence indicates a diet strongly based on marine foods, consistent with long-term coastal adaptation. The island setting and marine diet strengthen the case that coastal environments were not just transit zones, but places where people could live and thrive.

  11. Sea-level rise submerges much of the early coastal record

    Labels: Sea-level rise, Submerged coastlines

    After the last ice age, rising seas flooded large areas that had been coastal plains, beaches, and nearshore campsites. This submergence helps explain why the Pacific coastal migration route is harder to prove with very early shoreline sites: many of the most relevant locations may now be underwater. As a result, research increasingly combines underwater mapping, sediment cores, and targeted coastal excavations to rebuild the missing record.

  12. Kelp Highway hypothesis formalizes coastal-route model

    Labels: Kelp Highway, Nearshore corridor

    Researchers proposed that kelp forest ecosystems formed a long, resource-rich nearshore corridor around the North Pacific. In this view, early travelers could move by boat while relying on similar foods along the shoreline (fish, shellfish, sea mammals, seabirds, and edible seaweeds). The hypothesis also highlights a key challenge: many of the earliest coastal campsites may now be underwater because sea level rose after the ice age.

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Last Updated:Jan 1, 1980
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Pacific coastal migration: maritime routes and archaeological/paleoecological records (c. 18,000–8,000 BP)