ESS.1 Geologic Time scale

The Geologic Time Scale

The Geologic Time Scale is a
record of life forms and geologic
events in Earth’s history.

**Key Concept: Because the time span of
Earth’s past is so great, geologists use the
geologic time scale to show Earth’s
history.

The Geologic Time Scale

• The geologic time scale is a record of how

Earth and its life forms have changed through
time. For example, the scale shows when life
first appeared on Earth.

• In the geologic time scale, time is divided into

bigger blocks than years or centuries. The scale
begins when Earth formed 4.6 billion years
ago and goes to the present.

Open Ended

How do you make a timeline? What does a timeline look like?

Divisions of Geologic Time
(Look at a picture at bottom of your notes.)

• Earth’s 4.6-billion-year history is divided into

Precambrian time and three eras: Paleozoic,
Mesozoic, & Cenozoic.

• Each era is subdivided into a number of

periods. For example, the Paleozoic Era is
divided into six periods. The Cambrian Period
is important because it is the first period after
Precambrian Time

• The idea that Earth has always changed in uniform ways and that the present is the key to the past.

• Examples:

• Erosion

• Weathering

• Tectonic plate movement

• Deposition

UNIFORMITARIANISM

Multiple Select

Check all examples of uniformitarianism.

• 
  Erosion

• Tectonic plate movement

• Weathering

• Deposition

• Volcanic Eruption

The study of "STRATA" which studies about the arrangement, composition, origin, and distribution of rock layers.

Stratigraphy

Multiple Choice

Which of these rock layers is relatively the newest? Based on "Strata" or Rock Layers.

• 
  Kaibab formation

• Zoraster Granite

• Redwall limestone

• Tapeats Limestone

We live in the Cenozoic era!

• Present day Earth is in the Cenozoic era

and the Quaternary period in the
Holocene epoch.

• Geologic time has NOT ended!!!!!

Precambrian Time at 4.6 Billion

Years Ago

This period is the most important part of Earth's history. For nearly 4 billion years, during most of the Precambrian period, there were no plants or animals. Multicellular organisms developed later. Precambrian.

Precambrian Time at 4.6 Billion

Years Ago

Paleozoic Era at 544 Million Years Ago

Known as the “Age of Fish and Trilobites”

LIFE EXPLODES! At the beginning of the Paleozoic era,
all life lived in the OCEANS. Early invertebrates
developed and later reptiles became dominant on land.
Early plants included simple mosses, ferns, and cone-
bearing plants.

Paleozoic Era at 544 Million Years Ago

\

Multiple Choice

This Shark was considered a "Living Fossil". This shark was found in Japan in January 2007.

• Frilled Shark

• Megamouth Shark

• Megalodon

• Bull shark

Multiple Choice

During this era, the first fish appeared in. The oceans, and it is also known for the development of amphibians and the first land plants. Which species is a representative of the Paleozoic Era? 

• Coelacanth  

•  

  Mammoth

• Woolly Rhinoceros  

  
  

• Ginkgo Tree 

  
  

Paleozoic Era at 544 Million Years Ago

\

Multiple Select

What Causes the Mass extinction during Paleozoic Era? Click all that Applies.

• Volcanic Activity

• Climate Change

• Rise of Sea levels

• Invasive Species

Mesozoic Era at 245 to 65 Million Years Ago

(“Age of the Reptile/Dinosaurs”)

Dinosaurs lived along with the first mammals, birds,

and flowering plants. Dinosaurs were the dominant

species of the age. Reptiles were also dominant.

Mesozoic Era at 245 to 65 Million Years Ago

(“Age of the Reptile/Dinosaurs”)

Mesozoic Era at 245 to 65 Million Years Ago

(“Age of the Reptile/Dinosaurs”)

Multiple Choice

Name That Dinosaur!

• Tyrannosaurus rex

• Triceratops

• Stegosaurus

Multiple Choice

Name That Dinosaur!

• Spinosaurus

• Hadrosaurus

• Stegosaurus

Multiple Choice

Name That Dinosaur!

• Spinosaurus

• Hadrosaurus

• Stegosaurus

• Brachiosaurus

Mesozoic Era at 245 to 65 Million Years Ago

(“Age of the Reptile/Dinosaurs”)

Multiple Select

Why couldn't the dinosaurs survive the asteroid? Click all that Applies.

• Dense clouds of dust blocked the sun's rays,

• Drastic climate change that most dinosaurs couldn't adapt

• Massive tidal waves to wash over parts of the continents.

• A huge blast wave or a heat wave.

Multiple Choice

This era also saw the emergence of the first flowering plants,

Which plant species is associated with the Mesozoic Era? 

• Pine Tree  

• Magnolia  

• Fern  

• Oak Tree 

  
  

The first humans appeared in the later part of the
Cenozoic era, which continues today. The diversity of life
forms increased. New mammals and birds appeared while
other became extinct. Flowering plants became most
common.

Cenozoic Era 65 mya to Present Day

Cenozoic Era 65 mya to Present Day

Cenozoic Era 65 mya to Present Day

Multiple Choice

The Cenozoic Era includes the age of mammals, and one of the most significant groups to evolve during this time were the primates. One of the early primates is known for its tree-dwelling lifestyle.  

Which species is linked to the Cenozoic Era? 

• Australopithecus  

•  

  Woolly Rhino 

• Neanderthal  

Open Ended

If you could live in any period (pre-Cambrian, Paleozoic, Mesozoic, Cenozoic Era). Where would that be, and why?

Multiple Choice

Geologic time is divided into units based on ______.

•   a. geologic changes

•   b. fossils and rocks

   

•   c. types of life-forms living during certain periods

   

•   d. all of these

Multiple Choice

When does the geologic time scale begin?

• Approximately 4.6 billion years ago.
• About 1 billion years ago.
• Around 2.5 billion years ago.
• Approximately 3 billion years ago.

Multiple Choice

Which part of the geologic time scale is the longest?

•   Precambrian Time

   

•   Paleozoic Era

•  

    Cenozoic Era

• Mesozoic Era

Multiple Choice

Which era do we find humans?

 

•   a. Precambrian Time

   

•   b. Paleozoic Era

   

•   c. Cenozoic Era

•   d.  Mesozoic Era

Multiple Choice

Which era do we find dinosaurs?

 

• a. Precambrian Time

   

•   b. Paleozoic Era

   

•   c. Cenozoic Era

•   d.  Mesozoic Era

Multiple Choice

Choose the geological era each animal is from?

• Pre-Cambrian Eon

• Paleozoic Era

• Mesozoic Era

• Cenozoic Era

Multiple Choice

Choose the geological era each animal is from? (JellyFish Polyp)

• Pre-Cambrian Eon

• Paleozoic Era

• Mesozoic Era

• Cenozoic Era

Multiple Choice

Choose the geological era each animal is from?

• Pre-Cambrian Eon

• Paleozoic Era

• Mesozoic Era

• Cenozoic Era

Multiple Choice

Choose the geological era each animal is from?

(Trilobite)

• Pre-Cambrian Eon

• Paleozoic Era

• Mesozoic Era

• Cenozoic Era