Geological time Flashcards
How long does it take for half a group of parent atoms to decay into daughter atoms?
Half life
What are the two types of geological time?
absolute and relative
do you assign numerical values for relative time?
no
Which geological feature is older than the other?
the one that has been cut
What direction are sed layers deposited in?
horizontal
What is true about a sequence of sed rocks?
each layer must be younger than the layer below it
What does an unconfirmed layer contain?
erosional surface or a period of non deposition, gap in the rock record
What are the 3 types of conformities?
Angular unconformity, nonconformity, disconformity
What can longshore transport do?
evade and deposit sets
What are some erosional features?
wave cut cliffs, wave cut platforms, marine terraces, sea arches
what are some depositional features?
spits, barrier island, baymouth bar
describe angular unconforming?
erosional surface that ruts across previously tilted or folded layers
define nonconformity?
older sign/meta rocks with younger sed rocks on top
Do you assign numerical values for absolute time ?
yes
