1/7 DO: Today we will continue learning about the history of Earth. Bell work Notes, Chicken or Egg Video, time sequencing Work on Timeline 1/7 DO: Today we will continue learning about the history of Earth. DQ : Which came first, the chicken or the egg? Explain why you think this.

Sequencing Time Activity Numerical Time: Time that relates to the use of actual numbers and time-frames. Sequential time: time that relates to the order of events rather than the actual number. You will place events in your life in a sequence first! You will then add numerical time to your timeline. You will finally divide your life into eras.

Geologic History

Pre-Cambrian Hadeaon EON – Formation of the Earth and Solar System – 4.6 bya Archeaon EON – First life appeared! They were single celled organisms (blue-green algea) Proterozoic EON – First milti-cellular animals by the end!

Paleozoic Era & Cambrian Period Cambrian Era Paleozoic Era & Cambrian Period 542-488 mya Known as the Cambrian EXPLOSION! Meaning there was a large explosion of lifeforms! Skeletonized animals (exoskeletons) trilobites Warming climates

Evolution of life in Cambrian (10 min) https://www. youtube. com/watch Gentle Giants of Cambrian (5 min) https://www.youtube.com/watch?v=3aLd8NN0YtY&list=PL5E8sLSaVfS6RJtu1RcAQjQ0K0_m66KrX Adaptation: a change or the process of change by which an organism or species becomes better suited to its environment. Anomalocaris: Main predator of the Cambrian Trilobite: main prey organism of the Cambrian. Was also the most successful organism.

Paleozoic Era - Ordovician Period 488-444 mya diversification of marine organisms evolution of plants onto land. The Ordovician ended with a mass extinction. Development of coral reefs

Paleozoic Era Silurian Period 444-416 mya The start of significant life on dry land First Vascular Plants Sea Scorpions

Sea Scorpions

Paleozoic Era Devonian Period 416-359 mya “Age of the Fishes” Examples, placoderms, lobefin fish, cartilaginous fish, and bony fish First true trees Late Devonian extinction

Paleozoic Era Carboniferous Period 359-299mya “Coal Age,” very well known for plant fossils that make up the world’s major coal seams “Age of the Amphibians,” including ancestors of modern terrestrial vertebrates Evolution of amniotic egg in reptiles

Amphibian eggs Newly discovered “legless” amphibian- produces eggs that have yolk

Paleozoic Era Permian Period 299-252 mya Great diversity of amphibians and early reptiles Therapsids were common (mammal-like reptiles) Greatest diversity of insects of all time Seed plants became more dominant The period ends with the largest mass extinction in the past 600 million years

Mesozoic Era Triassic Period 252-200 mya Late Triassic- the origin and rise of dinosaurs and the first mammals Emergence of giant marine reptiles (ichthyosaurs) Extinction event at the end of the period

Mesozoic Era Jurassic Period 200-146 mya “The Age of the Dinosaurs”, stegasaurs, theropods, and huge sauropods, Allosaurus Origin of birds, pterosaurs- Archaeopteryx

Mesozoic Era Cretaceous period 146-65.5 mya Cretaceous means “chalk” Huge chalk deposits were created due to the accumulation of dead marine algae Sauropods, Iguanodon, Triceratops, Tyrannosaurus rex, Spinosaurus, mosasaurs Diversification of birds Extinction of dinosaurs Giant asteroid crater in Central America

Cenozoic Era Tertiary Period 65.5-2.6 mya Birds flourished in the skies as the holdouts of the dinosaur age Grasslands emerge and become the most successful plant on Earth Herds of grazing mammals are seen Kelp evolves, sea otters, & dugongs (related to the elephant) Megalodon appears as the biggest shark of all (15meters long) Two-footed Hominins split from chimpanzees

Dugongs- a marine mammal related to the elephant

Cenozoic Era Quaternary Period 2.6 to present mya “Age of Humans” Whales and sharks rule the seas Massive mammals evolve such as mammoths, rhino and bison with shaggy coats adapted to the ice age Ice ages are the result of the Earth’s wobbly orbit around the sun Summary video