Chapter 12 Post Lab

The principle of superposition can be used to determine the relative ages of all of these except

Folded sedimentary rocks

The longest interval of geological time is a

Eon

After three half-lives have elapsed for an element the percentage of parent element atoms present will be

12.5%

Is sedimentary rock contains zircon class that have been dated radiometrically as ranging from 1,000,000 to 250,000,000 years old the oldest at the rock can be is

250,000,000 years

The principle of inclusions states that

A sedimentary rock must be younger than the clasts that it contains

A nonconformity occurs when

A series of sedimentary rocks sits upon eroded igneous rocks

If a sequence of sedimentary rocks has been folded and is now vertical

Graded bedding can help determine whether some beds are older or younger than the beds next to them

If a fault offsets a sequence of sedimentary rocks, what must be true about the fault

It is younger than the rocks based on the principle of cross cutting relationship

The numerical age of a sedimentary rock can be determined in the field from which type of feature or characteristic

None of the above

The shorter the half life of a radiogenic element the more useful it will be for dating

Very young events

The term relative age refers to

Whether a feature is older or younger than another

A disconformity occurs when

There has been some uplift and erosion but no folding between deposit and rocks above and below the disconformity

An angular unconformity is evidence that

There is an incomplete geological record preserved in an area

In order for a fossil to be used as an index fossil the species must have existed for a

Very short span a geological time and live throughout the world