Welcome and Happy St. Patrick’s Day!!!! : Welcome and Happy St. Patrick’s Day!!!! Remember to have this week’s homework questions with you.
Do not use IM option for personal conversation during presentation.
If I go into a coughing fit I apologize in advance.
Please leave questions not related to the content, but related to science, until the end of the presentation.
Non science related questions can be asked via appointment, e-mail, or in class.
This session is recorded included typed messages so please keep all comments and topics appropriate to this lesson.
As my Irish grandmother used to say: “Ireland and Science forever!”
What we will learn today…. : What we will learn today…. How fossil clues can tell us about the way life existed in the past.
How fossil and rock clues tell us of major environmental shifts.
How fossil clues support continental drift.
Limits to Relative Dating.
Why Absolute Dating and Relative Dating are most effective when used together.
What is correlation?
Limitations and Benefits of Relative Time : Limitations and Benefits of Relative Time Benefits
Tells the order in which rock and fossils were created.
Can tell us the order in which great environmental and landscape changes took place.
Can tell us the order in which species were introduced and became extinct.
Makes distinctions between the time frames where one climate, species, or geologic events happened. Limitations
It can tell us a lot of information but only for a specific area.
Cannot tell us exactly when events happened or when a species was introduced or became extinct.
Types of rock layers vary from place to place so we cannot say conclusively that all similar rock types and their fossils were created at the same time.
So why not just use Absolute Time? : So why not just use Absolute Time? Benefits
Can give us the exact ages, order of creation and extinction, and times major environmental and geological events happened.
Can tell us the age of fossils and rocks that are separated from their rock layers. Limitations
Can tell us all the things Relative Time can but only if we use it with a core sample or exposed rock layers.
Makes no distinction between the time frames that major climates, species types, and geologic events happened.
Just like Relative Time it is site specific.
Seems like site specific is a big issue…how do we solve it? : Seems like site specific is a big issue…how do we solve it? Correlation!!!!!!!
Correlation gives us the ability to compare core samples from multiple sites.
By correlating their exact age and relative time order, we can determine what events were taking place, what species and climates existed, and environmental and geologic changes that occurred at the same in different locations around the world.
So, to take a page from another great teacher, Geologic Time is… : So, to take a page from another great teacher, Geologic Time is… Relative Time Absolute Time Correlation Like a shamrock,
Geologic Time is
three parts in one,
and must use all
three parts
to be effective and
accurate.
By putting all three parts together we can…. : By putting all three parts together we can…. State the order of events using Relative Time.
Find out specifically when and for how long things happened using Absolute Time.
Compare these findings with other findings from different locations across the globe using Correlation.
You should be using this to answer Tuesday # 2 BTW my WSS!
With Geologic Time We Can …Support The Continental Drift Theory : With Geologic Time We Can …Support The Continental Drift Theory By correlating fossils found in a specific type of rock from a specific time on one continent with another fossil found in exactly the same type of rock from the same time frame on another continent, we can conclude these continents were once joined. Wednesday #1 is provided here!
We Can Determine Major Environmental Changes… : We Can Determine Major Environmental Changes… If a core sample shows species existing in an older layer, then no species existing at all in a younger layer and new species existing in an even younger layer, something must have happened to the older species.
One explanation is that because some species may not be able to survive in specific climates and environments, if the climate and environment changes that species may die out!
Thursday # 1 Here!
We Can Tell A Story Of What Events Happened In Certain Relative Time Periods : We Can Tell A Story Of What Events Happened In Certain Relative Time Periods Using all three components of Geologic Time, we can draw a lot of conclusions about fossils and rocks from certain time periods and piece together the puzzle of Earth’s history. Here you go for Thursday # 2
Now that you know you can make conclusions about rock layers on your own!!!! : Now that you know you can make conclusions about rock layers on your own!!!! Try figuring out Wednesday # 2 out on your own! Here’s your clues:
The oldest Layer of an area is full of aquatic life fossils including sea shells and fish bones. What does this tell us?
The second oldest layer has no fossil records at all. What does this tell us?
The youngest layer is full of fossils from land animals. What does this tell us?
Put all three answers together and you have your 3 sentence answer to the question!!!!!!
What you can be sure of tomorrow… : What you can be sure of tomorrow… I will be in regardless of health to make sure we are caught up.
You WILL NOT have a test this week due to my absences.
WE WILL visit web sites to further provide you evidence to support what you learned here.
The wonderful NCAA Championship Tournament for basketball will be exciting.
Happy St. Patrick’s Day!