final two- dating methods

Question 1

absolute vs. relative dating

Answer 1

absolute results in concrete dates usually with error range. while relative dating results in knowing when something happened in relation to another event

Question 2

radio carbon dating

Answer 2

40,000 ya to present organic materials only ^14C decays to ^14 N at known rate (half life is 5730)

Question 3

K-Ar and Ar-Ar

Answer 3

Volcanic materials only, 500,000 ya at least, measure rate of which potassium turns to argon

Question 4

trapped electron methods

Answer 4

measure the number of trapped electrons, amount of time trapped can be measured

Question 5

OSL

Answer 5

1000 ya - 1mya, quartz and feldspar grains, determine last time that the sample was exposed to light

Question 6

TL (thermoluminescence)

Answer 6

used to date crystalline materials, 2000-200,000 ya

Question 7

paleomagnetism

Answer 7

based on reversal of earths magnetic field/orientation of magnetically polarized rate

Question 8

faunal dating

Answer 8

Using the presence of fossils at a site that are known to have persisted for a given period based on data from many other sites to date the site.