1. Which of the principles apply to sedimentary rocks? 2. Look at the diagrams b

Question

1. Which of the principles apply to sedimentary rocks?

2. Look at the diagrams below each question to answer.
a. In figure 1 below, could it be possible to determine an absolute age of these rocks? If
yes, explain in detail how you may be able to do this:

b. In figure 3 below, could it be possible to determine an absolute age of these rocks? If
yes, explain in detail how you may be able to do this:

Principle of superpasiton: in a sequence ofundeformed sedimentary rocks, the oldest beds are on the bottoes and the youngest are on the lop. Principle of original horizontality: sedimentary layers are horicontal, or mearly so, when oniginally deposited Strata that are not horizontal have been deformed by movements of Principle of faunal seccssin groups of fossil plants and animals oxcur in the peologic record in a definite and determinable order. A period of geologic time can be recognized by its Principle of eresscutting relativas: peologic feanures, such as faults, and igneous inrusions ae Principle of iaclesion: a rock body thest contains inclusions of preesisting rocks is younger that respective fossils younger thn the eocks they cu the rocks trom which the inclusions cme trom

Explanation / Answer

1) principle of superposition, principle of original horizontality

2&3) to determine absolute ages, a rock must contain radioactive elements or minerals in it. the rocks shown above contain an igneous intrusion but we don't know whether they have radioactive elements in it or not . If they have radioactive elements then we can find the absolute age of these rocks by measuring their half lifes

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