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History of Life on Earth

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by

George Bates

on 29 February 2016

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Transcript of History of Life on Earth

History of Life on Earth
Evidence of the Past
Fossil:
the remains or physical evidence of an organism preserved by geological processes
Age of Fossils
How do we know how old a fossil is?
1.
Relative Dating:
(
Not
like taking your cousin to a movie) any method of determining whether an event or object is older or younger than other events or objects
Geologic Time Scale
The Changing Earth
Plate tectonics:
the theory that explains how large pieces of the Earth's outermost layer, called
tectonic plates
, move and change shape
Eras of the Geologic Time Scale
Precambrian Time
: The time from the formation of the earth,
4.6 billion years ago to about 543 million years ago

Paleozoic Era
543mya - 248mya
The word
paleozoic
comes from Greek words that mean "ancient life"
Mesozoic Era
248mya - 65mya
Mesozoic
comes from Greek words that mean "middle life."
The Mesozoic Era is known as the
Age of Reptiles.
Cenozoic Era
Cenozoic
come from the Greek word that mean "recent life."
The Cenozoic Era is called the
Age of Mammals.

2.
Absolute Dating:
any method of measuring the age of an object or event in years
Lets dig a little deeper and review!
Complex version
Simpler version
Humans and Other Primates
Primate: a type of mammal with opposable thumbs and binocular vision
Hominid: a type of primate characterized by bipedalism, relatively long lower limbs, and lack of a tail
Australopithecines
Early Homo
Homo sapiens
Bipedalism
Yes
Yes
Yes
Brains
medium
larger
largest
Tools
none
some
many
Art
none
none
a lot
Full transcript