Geologic History Review - Relative & Absolute Dating & Fossils Review

Fossils of widely distributed organisms that lived during a geologically short period.

Originally, geologists placed Earth’s rocks in order by

Which type of fossil?

The law that says that the older layers or rock are below the younger layers.

How much parent isotope remains after 2 half-lives?

Which type of fossil?

Which rock layer is youngest?

The preserved remains or traces of an organism that lived in the past.

What is G_F?

A sample has 6.25% of its original radioactive material, how many half lives have passed?

The principle that states that the geologic feature which cuts another is younger than the feature it cuts through.

Principle that states that layers of sediment are originally deposited horizontally.

Which type of fossil?

What must happen first if an organism is going to become a fossil.

How long is the half-life of Carbon-14 according to this graph?

When did P happen??

What type of fault G_F, and what kind of stress caused it?

Which type of organism has the best chance of being fossilized?

The radioactive element used to determine the age of more recent remains of organisms (Organic material)

An igneous intrusion is ________________ than the rock it cuts through.

Which type of fault is G_F?

What percent of PARENT isotope at 0 time?

An igneous rock layer formed when magma hardens INSIDE the Earth.

Which type of fossil?

A sample has 50% of its original radioactive material, how many half lives have passed?

What came first?

A break in Earth's crust along which rocks move.

A sample has 12.5% of its original radioactive material, how many half lives have passed?

Radiometric dating works best for which type of rock?

A scientist who studies fossils to learn about organisms that lived long ago.

The age of a rock compared to the ages of other rocks.

How old is a rock that contains 12.5% of its original Potassium-40? (half-life 1.3 by)

A gap in the geologic record that shows where rock layers have been lost due to erosion.

How old is a rock that contains 50% of its original Potassium-40? (half-life 1.3 billion years)

What is G_F, and how did it most likely happen?

Which type of fossil?

The law that states that if a rock body contained fragments of another rock, it must be younger than the fragments.

What happened last?

The age of a rock given as the number of years since the rock formed.

Between which rock layers is there an unconformity?

How much DAUGHTER product is there after 2 half-lives?

An igneous rock layer formed when lava flows onto Earth's surface and hardens.

Which type of fossil?

A sample has 25% of its original radioactive material, how many half lives have passed?

The law that says layers of sediment initially extend to the side in all directions

What percent of DAUGHTER product at 0 time?

What is C_U?

Which rock layer is oldest?

Which type of fossil is this nest with eggs?

Process in which the nuclei of radioactive elements break down, releasing energy and particles.

The time it takes for half of the atoms of a radioactive element to decay.

Which type of fossil?

Which could be an Index Fossil?

Which type of fossil?

What is C_U, and how did it most likely happen?

List the ages from oldest to youngest.