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Geologic Time Scale. Ch 18. Geologic Time Scale. Law of superposition- youngest is on top oldest on bottom Geologic column- arrangement of rock layers. Era- A very large unit of time Period-A division of an Era Epoch-A division of a Period. Section 18.1 review.

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geologic time scale1
Geologic Time Scale
  • Law of superposition- youngest is on top oldest on bottom
  • Geologic column- arrangement of rock layers
slide3
Era- A very large unit of time
  • Period-A division of an Era
  • Epoch-A division of a Period
section 18 1 review
Section 18.1 review
  • Scientists use events such as major changes in the earth’s surface and climate and the extinction of various species as the basis for dividing the geologic time scale into units.

True

section 18 1 review1
Section 18.1 review
  • Using the law of superposition and the study of index fossils, nineteenth century scientists determined the relative ages of rock layers

True

False

  • Eras are subdivisions of periods
section 18 1 review2
Section 18.1 review
  • Scientists can use the geologic column to estimate the relative ages of rock layers only if the rock contains radioactive minerals

False

  • Fossils of mammals are common in Cenozoic rocks

True

complete the statement
Complete the statement
  • Rock layers in the geologic column can be distinguished from one another according to rock type and__________
  • The geologic era that followed Precabrian time is called the _________

Fossil content

Paleozoic Era

complete the statement1
Complete the statement
  • According to the geologic column in the diagram, the oldest rock layer is__________
  • Based on late Precambrian fossils and other types of geological evidence, scientists theorize that life began _________

Layer 4

In the ocean

last question in 18 1
Last question in 18.1
  • The era that is divided into epochs is the ___________

Cenozoic Era

theory of evolution
Theory of Evolution
  • Organisms change over time. New kinds of organisms are derived from ancestors.
precambrian time
Precambrian time
  • Started 4.6billion years ago
  • Ended 540million years ago
  • Characteristics of this time:
    • Soft-bodies or single cell organisms, Stromatolites
    • Lots of volcanoes, mountain formation, sediment formation & metamorphism
paleozoic era 540 248 million years ago
Paleozoic Era 540-248 million years ago
  • Periods:
    • Cambrian
    • Ordovician
    • Silurian
    • Devonian
    • Carboniferous
    • Permian
paleozoic era 540 248 million years ago1
Paleozoic Era 540-248 million years ago
  • Cambrian
    • Advanced forms of marine life and first invertebrates appear
  • Ordovician
    • Brachiopods increase: trilobites decline: graptolites flourish: First vertebrates (fishes appear)
paleozoic era 540 248 million years ago2
Paleozoic Era 540-248 million years ago
  • Silurian
    • First land plants and animals appear
  • Devonian
    • Age of fishes
    • First amphibians
    • Ferns and cone bearing plants
paleozoic era 540 248 million years ago3
Paleozoic Era 540-248 million years ago
  • Carboniferous
    • Split into two epochs: Mississippian and Pennsylvanian
    • Amphibians flourish
    • Giant cockroaches
  • Permian
    • Pangaea comes together mass extinctions
mesozoic era 248 65 million years ago
Mesozoic Era248-65 million years ago
  • Periods
    • Triassic
      • First Dinosaurs, tropical weather,
    • Jurassic
      • Large Dinosaurs, tropical weather,
    • Cretaceous
      • First flowering plants, mass extinction
cenozoic era 65 million years to today
Cenozoic Era65 million years to today
  • Periods
    • Tertiary
      • Paleocene
      • Oilgocene
      • Miocene
      • Pliocene
    • Quaternary
      • Pleistocene
      • Holocene
cenozoic era 65 million years to today1
Cenozoic Era65 million years to today
  • Periods
    • Tertiary
      • Age of mammals
      • Pangaea separates
    • Quaternary
      • Ice age and human’s develop
18 2 review
18.2 review
  • The presence of cross-bedded sandstone may indicate that the region where it is present was once:
  • Shields are large areas of exposed rock of what era?
  • The fossil record indicates that which of the following thrived during the Paleozoic Era

A desert

Precambrian

Advanced

forms of

marine life

18 2 review1
18.2 review
  • The Devonian period is also known as the Age of
  • Dinosaurs first appeared during the
  • During which era did glaciers cover nearly one third of the earth’s land area?

Fishes

Triassic period

Cenozic

18 2 review2
18.2 review
  • During which epoch did the first modern horses appear?
  • Which geologic period is missing from this diagram?

Pilocene

Silurian

The Paleozoic Era

Cambrian Ordovician_________Devonian

Time

18 2 review3
18.2 review
  • What are the most common Precambrian fossils called?
  • Which period of the Cenozoic Era includes the time before the last major ice age

Stromatolites

Tertiary