relative dating Flashcards
1
Q
what is relative dating?
A
a comparison of fossils to tell us whether one sample is older or younger than another
2
Q
what are the 3 types of relative dating?
A
superpositioning
comparative stratigraphy
index fossils
3
Q
what is superpositioning?
A
unless disturbed, the lower beds in a sedimentary sequence are older than the rocks above
4
Q
what is comparative stratigraphy
A
study of sedimentary rocks
sequence of sedimentary rocks in different areas is similar = same age
5
Q
what are index fossils?
A
distinctive appearance
have a short time span with broad geographical distribution
rocks in different locations contain the same index fossils = areas of the same age
