RESEARCH BASE
Search 3,721 documents across 34 fields — every claim tier-rated by evidence
3,633 are the core, quality-scored corpus (34 lettered sections — see How We Work); the remaining 88 are cross-corpus synthesis documents (68 InterDocs, 12 Connections, 8 Theories) also indexed here.
16 results for "ice-free corridor"
L_2_05 — Americas Peopling Genetics
The peopling of the Americas is one of the clearest cases where ancient DNA and archaeology have converged to overturn an older narrative. The core model now favored by genetics is that the main ancestry of Indigenous Am
L_2_09 — Genetic History of the Americas: Clovis to Contact
The genetic history of the Americas — from the initial peopling of the New World to the devastating population collapse after European contact — is one of the most intensively studied and rapidly evolving areas of paleog
F_1_22 — Peopling of the Americas: Routes & Chronology
The peopling of the Americas — when, how, and by whom the Western Hemisphere was first colonized by modern humans — is one of the most actively debated questions in archaeology, genetics, and paleoanthropology, with the
F_1_16 — Coastal Migration Hypothesis: Kelp Highway and Pacific Rim
The coastal migration hypothesis (also known as the "Kelp Highway" hypothesis) proposes that the initial human colonization of the Americas occurred not via the traditional ice-free corridor through the interior of North
F_1_12 — Beringia: Land Bridge, Migration, and Lost Landscape
Beringia — the vast landmass that periodically connected northeastern Asia to northwestern North America across what is now the Bering Strait and the shallow Chukchi and Bering Seas — was one of the most consequential ge
F_1_07 — First Americans Debate — Clovis, Pre-Clovis, and Coastal Routes
The question of when and how humans first reached the Americas has been transformed in the 21st century by a series of discoveries that have demolished the long-reigning "Clovis-first" paradigm. For decades, the archaeol
ZB_4_12 — Landscape Ecology: Patches, Corridors, and Mosaics
Landscape ecology studies how spatial patterns of ecosystems — the arrangement, size, shape, and connectivity of habitat patches within a heterogeneous landscape mosaic — influence ecological processes including species
F_2_23 — Steppe Corridor: Bronze Age Eurasian Exchange Before the Silk Road
For at least 3,000 years before the formalization of the Silk Road (c. 130 BCE), the Eurasian steppe corridor — a continuous grassland belt stretching 8,000 km from Hungary to Manchuria — served as the primary conduit fo
F_2_17 — Trans-Saharan Rock Art Corridors: Mobility Evidence in Stone
The Sahara Desert — today the world's largest hot desert (~9.2 million km²) and one of Earth's most formidable barriers to human movement — was, during recurring humid periods (the "Green Sahara" or "African Humid Period
M_5_07 — Impossible Ancient Maps of Antarctica: Critical Assessment
Among the most provocative claims in alternative history is the assertion that several medieval and Renaissance-era maps depict Antarctica — a continent not officially discovered until 1820 and not mapped until the 20th
M_4_13 — Earth Crustal Displacement: Hapgood's Theory and Its Legacy
Earth crustal displacement (ECD) — the hypothesis that the Earth's lithosphere can shift as a relatively intact shell over the underlying asthenosphere, rapidly relocating the geographic positions of continents relative
ZF_2_03 — Marine Migration Patterns and Cetacean Intelligence
Marine animals execute some of the most extraordinary navigational feats in biology — humpback whales migrating 8,000+ km between polar feeding grounds and tropical breeding waters, sea turtles returning to their natal b
ZF_4_11 — Sea Ice Dynamics and Polar Oceanography
Sea ice — frozen seawater that forms a thin crust (typically 1–4 m thick) over polar and subpolar oceans — is one of Earth's most dynamic and climate-sensitive features, playing a disproportionate role in global climate
ZB_1_03 — Animal Navigation and Migration — Magnetism, Stars, and Memory
Animal migration and navigation represent some of the most astonishing feats in biology: monarch butterflies traveling 4,000 km across North America using a time-compensated sun compass; Arctic terns completing 71,000-km
ZB_5_14 — Conservation Biology
Conservation biology — the scientific study of biodiversity loss and the methods to protect species, habitats, and ecosystems — was formally established as a discipline by Michael Soulé (University of California, San Die
R_5_15 — Rewilding: Ecological Restoration Through Trophic Cascades and Keystone Species Reintroduction
Rewilding is a conservation strategy that aims to restore self-sustaining ecosystems by reintroducing native keystone species — particularly large predators and megaherbivores — and reconnecting fragmented habitats throu
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