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GEOLOGIC TIME Earths History Compressed:

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

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

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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 20-40 m.y.

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

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

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II. Constancy of Natural Laws

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A. Catastrophism Georges Cuvier (late 1700's)

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

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

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

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

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

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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

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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

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

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An Example……

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

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III. Types of Geologic Dating alpha decay

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III. Types of Geologic Dating alpha decay

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III. Types of Geologic Dating beta decay

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III. Types of Geologic Dating beta decay

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III. Types of Geologic Dating electron capture

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III. Types of Geologic Dating electron capture

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III. Types of Geologic Dating neutron capture N P

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

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An Example…. Parent U 238

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An Example…. Parent U 238 92 protons 146 neutrons

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An Example…. Parent U 238 8 alpha + 6 beta = ? 92 protons 146 neutrons

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An Example…. Parent U 238 8 alpha + 6 beta 92 protons 8 {lose 2 protons} + 8{lose 2 neutrons}

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An Example…. Parent U 238 8 alpha + 6 beta 8 {lose 2 protons} + 8 {lose 2 neutrons} - 16 protons - 16 neutrons

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An Example…. Parent U 238 8 alpha + 6 beta 8 {lose 2 protons} + 8 {lose 2 neutrons} - 16 protons - 16 neutrons

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An Example…. Parent U 238 8 alpha + 6 beta 8 {lose 2 protons} + 6 (add 1 proton) 8 {lose 2 neutrons} - 16 protons - 16 neutrons

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An Example…. Parent U 238 8 alpha + 6 beta 8 {lose 2 protons} +6 (add 1 proton) {lose 2 neutrons} - 16 protons+ 6 protons - 16 neutrons

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An Example…. Parent U 238 8 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

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An Example…. Parent U 238 8 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

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An Example…. Parent U 238 8 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

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An Example…. Parent U 238 8 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 92 protons – 10 protons = 82 protons

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An Example…. Parent U 238 8 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 92 protons – 10 protons = 82 protons X 206 with 82 protons

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U 238 – 32 = X 206 92 protons – 10 protons = 82 protons

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An Example…. Parent U 238 8 alpha + 6 beta = ? Pb 206 Atomic # = 82

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

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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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C 14 N 14 5730 yearsorganic carbon

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

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B. Carbon Dating

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IV. Geologic Time

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