Monday, September 19th

Please write down Homework:Tier 1 Geological Time due

TOMORROW

Tier 1 • Make flashcards from PowerPoint

online

• Interactive Workbook

I. What is the Geologic Time Scale?

a. Based on their interpretations of the rock record, geologists have divided Earth’s 4.56-billion-year history into units that represent specific amounts of time. Taken together, these time spans make up the geologic time scale.

I. What is The Geologic Time Scale

b. The geologic time scale is divided into sections based on fossil evidence.

c. Organisms have become more complex over time.

d. Geologic time divisions represent changes in the fossil evidence.

II.Measuring Geologic TimeA. Eras (largest divisions)

1. Precambrian – earliest, 4 billion years

2. Paleozoic – 345 million years

3. Mesozoic – 160 million years

4. Cenozoic – current, so far 65 million years

B. Eras are divided into periods (except for Precambrian)

C. Cenozoic periods are divided into epochs

III. Geologic ErasA. Precambrian

1. Earth forms including seas & mountains

2. Few fossils of jellyfish, worms, bacteria, algae, & fungi

B. Paleozoic – 6 periods1. Invertebrates most common

a. Trilobitesb. Brachiopods

2. Vertebrates – fish and amphibians

3. Plants – ferns and trees in swampy areas

Trilobite

Trilobite

Trilobite

Brachiopods

Brachiopods

Brachiopods

EryopsEryops

Eryops

Eryops

C. Mesozoic – 3 periods1. Pangaea began to break apart2. Cycads & conifers evolved3. “Age of the Reptiles”4. Dinosaurs became extinct

Tyrannosaurus rex

Cycads

D. Cenozoic – 2 periods1. “Age of Mammals”2. At least 4 ice ages

Question of the Day

How would a new era start?!?!

Fossil ProjectProject – You should have finished Stage 1 and 2 and be working on Stage 3.

Stage 1: Paragraph about each scientists for a total of 3 paragraphs

Stage 2: Fossilization Process: illustrated and described. Pick ONE fossil to describe and illustrate

Stage 3: DEFEND your 3 fossil discoveries… Why are they the MOST important, and to whom? Plot each on an outline map.

Earth time Scale• you and your partner will

complete 1 timeline that shows all the different eras.

• Make sure to write the event and the number of years ago!