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18 Matching questions

  1. Pangaea
  2. Pleistocene ice age
  3. snowball Earth
  4. Laramide orogeny
  5. Archean Eon
  6. Ancestral Rockies
  7. Cambrian explosion
  8. differentiation
  9. stratigraphic sequence
  10. shield
  11. Hadean Eon
  12. superplume
  13. Phanerozoic Eon
  14. stromatolite
  15. Basin and Range Province
  16. cratonic platform
  17. epicontinental sea
  18. Proterozoic Eon
  1. a The remarkable diversification of life, indicated by the fossil record, that occurred at the beginning of the Cambrian Period.
  2. b The most recent of the Precambrian eons.
  3. c In the context of planet formation, the process by which a planet separates into a metallic core and a rocky mantle very early in its history.
  4. d A supercontinent that assembled at the end of the Paleozoic Era.
  5. e Layered mounds of sediment formed by cyanobacteria; cyanobacteria secrete a mucuous-like substance to which sediment sticks, and as each layer of cyanobacteria gets buried by sediment, it colonizes the surface of the new sediment, building a mound upward.
  6. f The middle Precambrian Eon.
  7. g A province in the interior of a continent in which Phanerozoic strata bury most of the underlying Precambrian rock.
  8. h An older, interior region of a continent.
  9. i A shallow sea overlying a continent.
  10. j The period of time from about 2 Ma to 14,000 years ago, during which the Earth experienced an ice age.
  11. k A broad, Cenozoic continental rift that has affected a portion of the western United States in Nevada, Utah, and Arizona; in this province, tilted fault blocks form ranges, and alluvium-filled valleys are basins.
  12. l Our planet during periods in the Precambrian when its entire surface was ice covered.
  13. m The mountain-building event that lasted from about 80 Ma to 40 Ma, in western North America; in the United States, it formed the Rocky Mountains as a result of basement uplift and the warping of the younger overlying strata into large monoclines.
  14. n The most recent eon, an interval of time from 542 Ma to the present.
  15. o An interval of strata deposited during periods of relatively high sea level, and bounded above and below by regional unconformities.
  16. p A huge mantle plume.
  17. q The oldest of the Precambrian eons; the time between Earth's origin and the formation of the first rocks that have been preserved.
  18. r The late Paleozoic uplifts of the Rocky Mountain region; they eroded away long before the present Rocky Mountains formed.