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GEOLOGIC TIME Earths History Compressed:. GEOLOGIC TIME I. Early Efforts of Dating the Age of the Earth.

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Presentation on theme: "GEOLOGIC TIME Earths History Compressed:. GEOLOGIC TIME I. Early Efforts of Dating the Age of the Earth."— Presentation transcript:

1 GEOLOGIC TIME Earths History Compressed:

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3 GEOLOGIC TIME I. Early Efforts of Dating the Age of the Earth

4 GEOLOGIC TIME I. Early Efforts of Dating the Age of the Earth A. James Ussher (mid 1600's) 4004 B.C.

5 I. Early Efforts of Dating the Age of the Earth B. Georges Buffon (mid 1700's) C. Lord Kelvin (late 1800's) 75,000 yr m.y.

6 I. Early Efforts of Dating the Age of the Earth D. Charles Walcott (1893) 75 m.y.

7 I.Early Efforts of Dating the Age of the Earth E. John Joly (1899) 90 m.y.

8 II. Constancy of Natural Laws

9 A. Catastrophism Georges Cuvier (late 1700's)

10 A. Catastrophism Georges Cuvier (late 1700's) B. Uniformitarianism James Hutton (late 1700's)

11 III. Types of Geologic Dating A.Relative Dating B.Radiometric Dating

12 III. Types of Geologic Dating A. Relative Dating 1. Law of Superposition

13 III. Types of Geologic Dating A. Relative Dating 1. Law of Superposition 2. Law of Original Horizontality

14 III. Types of Geologic Dating A. Relative Dating 1. Law of Superposition 2. Law of Original Horizontality 3. Law of Cross Cutting Relationships

15 III. Types of Geologic Dating A. Relative Dating 1. Law of Superposition 2. Law of Original Horizontality 3. Law of Cross Cutting Relationships 4. Law of Faunal Succession

16 III. Types of Geologic Dating A. Relative Dating 1. Law of Superposition 2. Law of Original Horizontality 3. Law of Cross Cutting Relationships 4. Law of Faunal Succession 5. Unconformities

17 III. Types of Geologic Dating 5. Unconformities –Disconformity –Angular Unconformity –Non Conformity

18 An Example……

19 III. Types of Geologic Dating B. Radiometric Dating 1. Types of decay

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21 III. Types of Geologic Dating alpha decay

22 III. Types of Geologic Dating alpha decay

23 III. Types of Geologic Dating beta decay

24 III. Types of Geologic Dating beta decay

25 III. Types of Geologic Dating electron capture

26 III. Types of Geologic Dating electron capture

27 III. Types of Geologic Dating neutron capture N P

28 III. Types of Geologic Dating B. Radiometric Dating 1. Types of decay alpha decay beta decay electron capture neutron capture

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30 An Example…. Parent U 238

31 An Example…. Parent U protons 146 neutrons

32 An Example…. Parent U alpha + 6 beta = ? 92 protons 146 neutrons

33 An Example…. Parent U alpha + 6 beta 92 protons 8 {lose 2 protons} + 8{lose 2 neutrons}

34 An Example…. Parent U alpha + 6 beta 8 {lose 2 protons} + 8 {lose 2 neutrons} - 16 protons - 16 neutrons

35 An Example…. Parent U alpha + 6 beta 8 {lose 2 protons} + 8 {lose 2 neutrons} - 16 protons - 16 neutrons

36 An Example…. Parent U alpha + 6 beta 8 {lose 2 protons} + 6 (add 1 proton) 8 {lose 2 neutrons} - 16 protons - 16 neutrons

37 An Example…. Parent U alpha + 6 beta 8 {lose 2 protons} +6 (add 1 proton) {lose 2 neutrons} - 16 protons+ 6 protons - 16 neutrons

38 An Example…. Parent U alpha + 6 beta 8 {lose 2 protons} +6 (add 1 proton) {lose 2 neutrons} - 16 protons+ 6 protons = - 10 protons - 16 neutrons - 10 atomic number

39 An Example…. Parent U alpha + 6 beta 8 {lose 2 protons} +6 (add 1 proton) {lose 2 neutrons} - 16 protons+ 6 protons = - 10 protons - 16 neutrons - 32 atomic mass - 10 atomic number

40 An Example…. Parent U alpha + 6 beta 8 {lose 2 protons} +6 (add 1 proton) {lose 2 neutrons} - 16 protons+ 6 protons = - 10 protons - 16 neutrons - 32 atomic mass - 10 atomic number U 238 – 32 = X 206

41 An Example…. Parent U alpha + 6 beta 8 {lose 2 protons} +6 (add 1 proton) {lose 2 neutrons} - 16 protons+ 6 protons = - 10 protons - 16 neutrons - 32 atomic mass - 10 atomic number U 238 – 32 = X protons – 10 protons = 82 protons

42 An Example…. Parent U alpha + 6 beta 8 {lose 2 protons} +6 (add 1 proton) {lose 2 neutrons} - 16 protons+ 6 protons = - 10 protons - 16 neutrons - 32 atomic mass - 10 atomic number U 238 – 32 = X protons – 10 protons = 82 protons X 206 with 82 protons

43 U 238 – 32 = X protons – 10 protons = 82 protons

44 An Example…. Parent U alpha + 6 beta = ? Pb 206 Atomic # = 82

45 III. Types of Geologic Dating B. Radiometric Dating 2. Half lifes, Parents, and Daughters

46 III. Types of Geologic Dating B. Radiometric Dating 2. Half lifes, Parents, and Daughters half life (def) n : the time required for something to fall to half its initial value (in particular, the time for half the atoms in a radioactive substance to disintegrate)

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48 C 14 N yearsorganic carbon

49 III. Types of Geologic Dating B. Radiometric Dating 3. An example

50 B. Carbon Dating

51 IV. Geologic Time

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