Review of Lesson 3 and 4

What is absolute dating?

• calculating an age in years for geologic materials

• being absolutely certain that you want to go out with a person

• counting the layers of sediment to determine how old a bone is

Tags

NGSS.HS-ESS1-5

What are zircons?

• Zircons are a type of sedimentary rock that forms in mountains.

• Zircons are an element on the periodic table

• Zircons are a special kind of mineral that can only form in volcanoes.

• Zircons are a type of sedimentary rock that forms in swampy areas

Tags

NGSS.MS-PS1-1

How are zircons used in absolute dating?

• Zircons develop rings, like trees, so you can count them to determine a rock's age

• Uranium breaks down into lead, so determining how much lead is in a zircon will give an age

• Looking at the amount of uranium and lead. More uranium equals older rocks.

What do we use a chart like this for?

• This tells us how old a fossil is depending on what rock formation it was found in

• This tells us the type of rock that is found in certain parts of Michigan

• This tells us how many years ago Cordell Dolomite was living in Michigan

• This tells us where fossils have been found

Tags

NGSS.MS-ESS1-4

NGSS.MS-LS4-1

What are strata?

• a type of fossil

• layers of sediment formed into rock

• different forms of zircons

Tags

NGSS.MS-ESS1-4

Which layer (strata) contains the oldest rocks?

• D

• C

• B

• A

Tags

NGSS.MS-ESS1-4

What type of rock is this strata?

• sedimentary

• igneous

• metamorphic

Tags

NGSS.MS-ESS1-4

When we placed all of our Michigan fossils in this timeline, what did we discover?

• brachiopods lived in every time period

• Several dinosaur fossils have been found in Michigan

• there are lots of animals that lived in Michigan

• there are some gaps in the fossil record where there are no fossils

Tags

NGSS.MS-ESS1-4

NGSS.MS-LS4-1

Which type of environment is typically the best for forming fossils?

• hot, dry desert conditions

• areas with lots of water, lots of sediment, and tons of high winds to blow them around

• areas with high winds or strong currents to move sediment

• areas with lots of water, lots of sediment, and just the right temperature

What is one reason why are there gaps in Michigan's fossil record?

• warm ocean water caused lots of animals to go extinct

• glaciers moved over the land, eroding sediments and destroying plant and animal remains

• dry deserts allowed many fossils to form, but the wind blew the bones away

• lots of fossil hunters found all the bones and teeth and put them in museums