# Travel >> Destinations >> North America

North America's Latitude During the Cambrian Period

During the Cambrian Period (541–485 million years ago), the continent we now call North America—then known as Laurentia—occupied a dramatically different position on the globe.

Paleogeographic Position

Latitude: ~10°–20° South of the Equator (Southern Hemisphere tropics)
Orientation: Rotated ~90° clockwise relative to today; modern "East Coast" faced south
Setting: Mostly submerged under shallow, warm epicontinental seas
Climate: Tropical to subtropical; no polar ice caps globally

Key Implications

Factor	Cambrian Effect
Sea level	High (no ice sheets); vast inland seas covered craton
Water temperature	Warm, ideal for carbonate deposition (limestone, dolomite)
Life	Cambrian Explosion – trilobites, archaeocyathids, early mollusks, brachiopods flourished in shallow seas
Sedimentation	Thick carbonate platforms (e.g., Great Basin, Appalachians) + clastic wedges (rift margins)
Tectonics	Passive margin on east (Iapetus Ocean); rifting on west

Evidence

Paleomagnetism: Magnetic inclination in Cambrian rocks indicates low southern paleolatitudes
Fossil assemblages: Warm-water taxa (archaeocyath reefs, tropical trilobite faunas)
Sedimentology: Carbonate platforms, evaporites, lack of glacial deposits
Plate reconstructions: Laurentia fits between East Antarctica & South America in Rodinia breakup models

Later Journey

Laurentia drifted northward across the equator in the Ordovician–Silurian, collided with Baltica (Caledonian orogeny) and Avalonia (Acadian), then merged with Gondwana (Alleghenian/Variscan) to form Pangaea—finally reaching its current northern temperate position after Pangaea's Mesozoic breakup.

The Cambrian tropics gave North America its foundational carbonate reservoirs, mineral deposits, and fossil record—a tropical birth certificate written in stone.

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