Exam 3: How Old Is Old the Rock Record and Geologic Time

The Allende meteorite is classified as a carbonaceous chondrite.

In the diagram below,the contact between C and E is a(n)

The principle of --------- states that a layer of sediment will extend horizontally as far as it was carried by the water that deposited it.

A sedimentary unit with hominid fossils is discovered in area of East Africa near the location of the stratigraphic sequence depicted in the figure below.These fossil-bearing gravels are inter-layered with sediments with a strong magnetic signal.If the magnetic polarity of the sediments is reversed then the age of the sediment is younger than _____ million years.

Our best estimate for the age of Earth is_____ billion years.

The most ancient rock body on Earth has a radiometric age of _____.

Paleomagnetic studies can be useful in dating both igneous and _____ rocks.

In the stratigraphic sequence of the Grand Canyon shown below,the Tapeats Sandstone is sitting on top of an angular unconformity.

If you know the half-life of a radioactive isotope that occurs in an igneous rock,what must you measure to determine the age of the rock?

In the stratigraphic sequence of the Grand Canyon,depicted below,the contact between the Muav Limestone and the overlying Redwall Limestone spans two missing periods of geologic time.The contact between these two stratigraphic units represents a(n)

In the figure below,deposition of unit 4 occurred

The three basic principles which can be used to determine the relative ages of rock units in a stratigraphic sequence are principle of ________,principle of original horizontality;and principle of cross-cutting relationships.