Geological Time Scale What time is it?

The Earth Is about 4.65 billion years old Paleontologists created a geological time scale to represent evolutionary time. This scale was developed based off of rock layers and fossils

How do you get a new era? Major changes in rock formation or fossils of animals and plants mark a new era

The Earth’s age This Geological time scale is divided into: Eras Which is divide into: Periods

The Geological Clock Each hour on the clock represents about 375 million years!

Time Machine Lets go back in time!!! Today we will be taking a trip back in time through the Eras and discovering what life was like back then. Lets go back in time!!!

Time Machine Mission: Reveal atmospheric conditions Discover the animals that roamed the earth. Compare marine and terrestrial organisms. Most importantly… What was here first? Not Me!!

Precambrian (Proterozoic) 88% of Earth’s history 1.7 billion yrs. ago Soft bodied, single celled organisms (bacteria) Photosynthetic algae which added oxygen to the atmosphere Fossils evidence is scarce from this era. WHY? We’re the 1st! Bacteria Rule!

Color and Label the Era Precambrian

Filling in the chart Era Time (yrs. ago) Organism Precambrian 1.7 billion Soft bodied, single celled organisms Bacteria/ algea

Paleozoic 544 Million yrs. ago Marine animals with or without a backbone Animals had hard parts: shells and outer skeletons First plants appear in damp, low to the ground places Ancestors of today’s jellyfish, worms, and sponges Paleo- ancient or early Trilobite What do you see?

Paleozoic 544 Million yrs. ago Ancestors of squid and octopi First vertebrates (jawless fish) First reptiles & sharks appeared Animals moved on to land Amphibian (water & land) Mass extinction at the end of this era

Color and Label the Era Paleozoic

Filling out the chart Era Time (yrs. ago) Organism Precambrian 1.7 billion Soft bodied, single celled organisms Bacteria/ algea Paleozoic 544 million Trilobite, jawless fish

Mesozoic 245 million yrs. ago “Age of the Dinosaurs” Cone bearing plants began to thrive First flowering plants Small Mammals First birds Turtles & crocodiles found in the seas Another mass extinction/end of this era Jurassic & Triassic Periods Cycads Meso- middle

Archaepteryx Link from Reptile to Bird

Color and Label the Era Mesozoic

Filling out the chart Era Time (yrs. ago) Organism Precambrian 1.7 billion Soft bodied, single celled organisms Bacteria/ algae Paleozoic 544 million Trilobite, jawless fish Mesozoic 245 million Dinosaurs, first flowers, first bird

Cenozoic 65 million yrs. ago “Age of the Mammals” Mammals adapted to live on land, water, and air Dolphins, whales appeared Grasses evolved A series of ice ages changed the Earth’s climate First Humans appeared (Homo sapiens) Ceno- recent Artie & Lucy

Color and Label the Era Cenozoic

Filling out the chart Era Time (yrs. ago) Organism Precambrian 1.7 billion Soft bodied, single celled organisms Bacteria/ algae Paleozoic 544 million Trilobite, jawless fish Mesozoic 245 million Dinosaurs, first flowers, first bird Cenozoic 65 million Large mammals, 1st humans

Geographical Time Scale Review The time scale is made up of 4 Eras: 1.Precambrian (yellow) 2. Paleozoic (blue) 3. Mesozoic (brown) 4. Cenozoic (green) Mass Extinction=.

Where does the Evidence come from? Paleontology-study of fossils Fossils: remains or markings left by organisms that lived in the past

How do Fossils Form? Water carries small rock particles to lakes & sea Dead organisms are buried by layers of sediment, which forms new rock

Fossils 3 Main Types of Fossils: 1. Preserved 2. Petrification At first I was afraid I was petrified… 3 Main Types of Fossils: 1. Preserved 2. Petrification 3. Traces

I. Preserved Organism Mummification- drying (deserts) Amber- hardened tree sap Tar Beds- petroleum ooze Freezing- mammoths

I. Preserved Fossils: Freezing Ötzi the Iceman, found in the Ötztal Alp 5,000 Years old Austria and Italy border

II. Petrification Petrification: organic material is replaced with minerals

III. Traces of organisms Trace Fossils- footprints Imprints- Leaves Mold- retains shape of the organism Cast- sand or mud fills the mold

III. Traces of organisms Coprolites- animal droppings Yes, it’s Dino Poo!

III. Traces of organisms Gastroliths- digestive stones

Review Fossil Facts Can you name 4 types of Preserved Fossils? Mummification Amber Tar Beds Freezing

Review Fossil Facts What’s the second type of Fossil? Pertrification

Review Fossil Facts Name 6 types of Trace Fossils. Trace Fossils Imprints Mold Cast Coprolites Gastroliths

Name That Era Lets Play…. Lets Play! Me first!! I wanna play, pick me!! Lets Play! Me first!!

Which era had only sea life? 75 million points Which era had many shell animals? ________ 10 million points Which era is the most recent? _______ 25 million points In which era did flowering plants first grow? Precambrian Cenozoic Paleozoic Mesozoic