Geologic Time “Evidence for Evolution” Evan Kline Witt Womack Danielle Sartain

What is Geologic Time? Earth’s history “recorded” in rock Humans use it as a handy tool and look at a timescale in segments. Using this, we can figure how old fossils are based on the time scale

Earth’s history “recorded” in rock

Humans use it as a handy tool and look at a timescale in segments. Using this, we can figure how old fossils are based on the time scale

How do you organize Geologic Time? Geologic Timescale

How is history “recorded” in rocks? We can find which rocks are from which era by their type and their position. (If they are lower in the crust, they are older, if they are higher, they are younger.) If we find fossils in certain layers, then we can “place” them into an era within the geologic time chart

We can find which rocks are from which era by their type and their position. (If they are lower in the crust, they are older, if they are higher, they are younger.)

If we find fossils in certain layers, then we can “place” them into an era within the geologic time chart

This is the Grand Canyon in terms of Geologic Time and rock layers

How does this support evolution? In older layers, you’ll find fossils of evolutionary ancestors of different species in younger layers. Using transitional evolution ideas, we can support evolution by the common traits of the older and newer species.

In older layers, you’ll find fossils of evolutionary ancestors of different species in younger layers.

Using transitional evolution ideas, we can support evolution by the common traits of the older and newer species.

See how we categorize the fossils based on their location? If we find transitional fossils lower and their descendants higher, then it provides evidence for evolution.

Why do we use a Geologic Time Scale? Historical records only go back a few thousand years and even then, they don’t contain much information To understand the timing of geologic process. Ex: Mountain formations, canyons eroding, Pangaea, the locations of ancient oceans, etc…

Historical records only go back a few thousand years and even then, they don’t contain much information

To understand the timing of geologic process.

Ex: Mountain formations, canyons eroding, Pangaea, the locations of ancient oceans, etc…

Why study fossils? Fossils provide us with information that was only available millions of years ago. They give us a history of the earth so we can see what was before us and they allow us to search for patterns in the evolutionary scale.

Fossils provide us with information that was only available millions of years ago.

They give us a history of the earth so we can see what was before us and they allow us to search for patterns in the evolutionary scale.

This is a completed fossil structure of a T-Rex. This is a fossil of an ancient fish that probably lived millions of years ago.

How has Geologic Time advanced our science technologies? One thing leads to another in the science world. When something is discovered, new technologies are brought to the business to study these discoveries and allow us to make even greater technologies for studying fossils and learning more from the earth from just rocks and fossils.

One thing leads to another in the science world. When something is discovered, new technologies are brought to the business to study these discoveries and allow us to make even greater technologies for studying fossils and learning more from the earth from just rocks and fossils.

Notice the patented and revolutionary brush. Scientists can put sonar sensors underground to aid them in searching for fossils. (This isn’t a fossil, it’s just a sonar picture.)

What can Geologic Time NOT provide? It can’t place things specifically on one date or even century. It can only provide a wide range of possible dates, which doesn’t hinder evolutionary scientists.

It can’t place things specifically on one date or even century.

It can only provide a wide range of possible dates, which doesn’t hinder evolutionary scientists.

Sources geologic time .&quot; Encyclopædia Britannica . 2009. Encyclopædia Britannica Online. 13 Apr. 2009 < http://search.eb.com/eb/article-9036466 >. http:// www.astro.lsa.umich.edu/~cowley/GCandMoon.html , . &quot;Geoscience: The Earth.&quot; Geoscience . 2004. Geoscience. 15 April 2009. http://www.amonline.net.au/geoscience/earth/dating.htm#what.

geologic time .&quot; Encyclopædia Britannica . 2009. Encyclopædia Britannica Online. 13 Apr. 2009 < http://search.eb.com/eb/article-9036466 >.

http:// www.astro.lsa.umich.edu/~cowley/GCandMoon.html

, . &quot;Geoscience: The Earth.&quot; Geoscience . 2004. Geoscience. 15 April 2009. http://www.amonline.net.au/geoscience/earth/dating.htm#what.