| Columbia (supercontinent) |
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Columbia is estimated to have been about 12,900 Kilometre s (8,000 Mile s) from North to South, and about 4,800 km (3,000 miles) across at its widest part. The east coast of India was attached to western North America , with southern Australia against western Canada . Most of South America rotated so that the western edge of modern-day Brazil lined up with eastern North America , forming a continental margin that extended into the southern edge of Scandinavia .1 Columbia began to break apart 1.5 billion years ago, the rifts from which have been found in the Western United States and India.2 The rifted fragments formed the supercontinent Rodinia about 500 million years later. SEE ALSO REFERENCES |
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