Excite-Making a Time Scale of Your Year

Excite-Making a Time Scale of Your Year

Geologic Time Test I can/can do/will know.(see the pink writing on the slides) List how old the Earth is slide 2 Explain how the start and endings of the divisions on the Geologic Timeline are determined. slide 2 Explain how scientists know all about Earths past slide 5 Define what an index fossil is and how it is a slam dunk in determining the age of a rock layer. slide 5 Place in order, by length, the time spans: Epoch, Era, Eon, and Period. (longest to shortest) slide 6

Explain how an organism's size/complexity tells us about its position on the Geologic Timeline. slides 7-12 List what eon and era we live in slides 8 &12 When the dinosaurs disappeared and why slide 10 Given fossil evidence, make conclusions about what events have taken place in history. slide 11 Geologic Time Scale

Helps us study Earths pastwhich is really old (estimated 4.6 billion years old) Divides Earths history into intervals of time determined by --major events/changes in the rock layers, and --the appearance/disappearance of fossils/life Slow Changes on our Earth Mountain forming Climate Erosion

Weathering Fast Changes on our Earth Volcanic Eruptions Earthquake Flood How do we know what has happened all this time? Fossil information Tells us what life existed when

Rock layers/sequencing Tells the relative age & what the environment was like Index fossils have a wide distribution world-wide, live for a short period of time in one particular time span, and help date the layer(s) they are found in. Fossilized seashells found in the mountains tells us that there was no mountains there long ago, just seafloor. Fossilized corals on land indicates that a previous ocean environment existed there. Divisions & sizes of Geologic Time spans Eon-largest unit of time (Earths history has four

eons) Era- A division of an Eon. The most recent eon is divided into three eras: Paleozoic, Mesozoic, and Cenozoic. Periods-Each era is subdivided into a number of periods. Epoch- The periods of the Cenozoic, the most recent era, are further divided into epochs

Pre-Cambrian Time Makes up 90% of Earths History Hadean, Archean, and Proterozoic eons make up the Pre-Cambrian Time Fossil record dominated by tiny, single celled organisms that can only be seen with a microscope (bacteria) and soft bodied animals that didnt fossilize (like jellyfish) Earth cooled, continents formed

Phaneorozoic Eon Divided into 3 Eras: Paleozoic- ancient life Mesozoic- middle life Cenozoic- recent life (our current eon) Paleozoic Era 542 mya to 251 mya

All life lived in the ocean at the start. Multi-celled life Early Paleozoic =Age of the Invertebrates Middle Paleozoic =Age of the Fishes Vertebrates & insects evolve and first plants Late Paleozoic =Age of the Amphibians Life started to move on land. Reptiles evolve. Pangaea and mountain ranges form Mass extinction happened at the end (248 mya)90% of all species perished.

Mesozoic Era 250 mya to 65 mya Bigger and more complex life Age of the Reptiles (dinosaurs dominate) Pangaea breaks up Sm. mammals, birds, and flowering plants first appeared & evolve. N. America covered by a sea

A mass extinction event (asteroid?) 65mya killed off 50% of all species (& the dinosaurs) from the heat at the impact site, lack of sunlight and thus photosynthesis world-wide, & other catastrophic impact effects (tsunamis, earthquakes, etc) KT Asteroid Is thought to have caused the mass extinction of the dinosaurs as evidenced by the lack of fossil size &

diversity afterwards Happened 65 million years ago Cenozoic Era 65 mya to present day (our current era) Age of Mammals biggest and most complex life Ice Age happened during this time

Mammoth, saber-toothed cats and other large mammals common during the first part of this time are now extinct End of era natural land bridges allowed first humans and animals to spread around the planet.

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