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10 Cards in this Set
- Front
- Back
- 3rd side (hint)
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What is the difference between absolute and relative dating? |
Absolute - BP/AD Relative - in terms of an event |
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What is dendrochronology? |
The dating of tree rings to indicate climate at certain points in time. Larger rings indicate warmth. |
Tree rings. |
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Drawbacks of dendrochronology? |
•Developed in the US in 20th century. -Level of agreement with 2 trees needs to be at least 65% over 100 years. -Trees with higher water intake are less affected by climate change I.e by water -False rings occur if a tree loses branches. |
Many drawbacks. |
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Dendrochronology example. |
Mary Rose planks dated 1510-11, with repairs in 1537. |
Mary Rose |
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What is radiocarbon dating? |
Dating C14 from a half-life of 5578 years. |
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What is AMS dating? |
•Counts all carbon samples(C12/13/14) in under an hour, used to date shell/bone. •13.6 disintegration’s per min per sample. |
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C14 in the atmosphere |
Varies from solar/magnetic field strength. Co2 fluctuates from carbon in sea. 1750 onwards fossil fuels. Bomb curves from 1950. |
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IntCal13 |
Data sets and calibration curves. |
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Radioactive clocks/Uranium series dating |
1. K-Ar half-life 1.3my In volcanic rock. 2. 238U In stalagmites, dates 50-500kya. |
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TL/OSL/Archaeomagnetism |
1. Electrons trapped in lattices from heated areas. Applies to pottery. 2. Same but light. Used when area is trapped by wind/water. 3. How close Iron particles are to north. Used to date hearths. |
1. Thermoluminescence 2. Optically stimulated luminescence 3. Iron |
