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Rock of the Day

Rock of the Day. Geologic Time & Dating. Rocks: upper, middle, lower Time: late, middle, early Ma for BP, m.y. for duration Names and relative ages: no problems if dates changes (unlike magnetic anomalies we will see later). Relative vs. Absolutes. Ages/dates Sea level rise Fault motion

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Rock of the Day

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  1. Rock of the Day

  2. Geologic Time & Dating

  3. Rocks: upper, middle, lower • Time: late, middle, early • Ma for BP, m.y. for duration • Names and relative ages: no problems if dates changes (unlike magnetic anomalies we will see later)

  4. Relative vs. Absolutes • Ages/dates • Sea level rise • Fault motion • Plate motion

  5. Maclurites • “Big Mac”

  6. Ammonite: Devonian to Cretaceous Goniates “similar”, Devonian to Permian

  7. Delaware State Fossil, The Belemnite Jurassic WY Hettangian age of the Lower Jurassic to the Maastrichtian age of the uppermost Cretaceous

  8. 7.5’ ammonite in British Columbia This extinct species takes its name from the Egyptian sun god of Ammon Ra who appeared in the form of a ram with „Ammon horns"

  9. Steno’s Laws • Principle of Superposition • Principle of Original Horizontality • Principle of Original Lateral Continuity   NicholasSteno (1638-1686) Dane, studied Netherlands, science career Italy

  10. Superposition Crosscutting Unconformity

  11. Lithologic correlations Fossil correlations

  12. Faunal Succession “Fossils have been long studied as great curiosities, collected with great pains, treasured with great care and at a great expense, and shown and admired with as much pleasure as a child's hobby-horse is shown and admired by himself and his playfellows, because it is pretty; and this has been done by thousands who have never paid the least regard to that wonderful order and regularity with which nature has disposed of these singular productions, and assigned to each class its peculiar stratum.” William Smith (canal engineer 1769-1839), notes written January 5, 1796

  13. Relative vs. Absolutes • Ages/dates • Sea level rise • Fault motion • Plate motion

  14. Carbon 14 has half life of 5730 years; can go out to about 10 half lives Closed system (e.g. lose Ar) Resetting

  15. Unconformity Date the sea floor—age of the MORB, sediments above

  16. Not used, not testable

  17. End Permian

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