Geologic Time Scale.

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Presentation transcript:

Geologic Time Scale

Earth’s Age About 4.6 billion years old 1st life appeared in the oceans more than 3.6 billions years ago. Time is separated by major events Era = periods of time of major events

Paleozoic Era Formation of life started Oxygen was formed by the process of photosynthesis Time period where animals started to move from the oceans to land Animals/Plants = sponges, corals, snails, squids, trilobites, and ferns

Real / Natural Sponge

FAKE / Human-made Sponge

Mesozoic Era Mesozoic = Middle Age of Reptiles – Triassic, Jurassic, Cretaceous Animals/Plants = dinosaurs, conifers, and flowering plants

Cenozoic Era Cenozoic = Recent Life Age of Mammals Animals/Plants = Mammals

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