Chapter 21 section 21 2 relative age dating of rocks

Chapter 21: Fossils and the Rock Record

Section 21 2 relative age dating of rocks

relative ages of rocks 2
  • because of this, the oldest rocks are at the bottom.
relative ages of rocks 2 matching up rock layers — evidence used for correlation. relative ages

Chapter 21: Fossils and the Rock Record

Section 21 2 relative age dating of rocks answers

  • if the same types of fossils were found in the limestone layer in both places, it’s a good indication that the limestone at each location is the same age, and therefore, one continuous deposit.
    • another type of unconformity, called a nonconformity, occurs when metamorphic or igneous rocks are uplifted and eroded.
    relative ages of rocks 2
    • if you look closely, you might find an old surface of erosion.
    relative ages of rocks 2 matching up rock layers — evidence used for correlation.

    The Evidence for Evolution

    —oldest rocks on the bottom
    • according to the principle of superposition , in undisturbed layers of rock, the oldest rocks are on the bottom and the rocks become progressively younger toward the top.
      • when layers have been turned upside down, it’s necessary to use other clues in the rock layers to determine their original positions and relative ages..Section check 2 question 3 describe the differences between a disconformity and a nonconformity.
      relative ages of rocks 2
      • sometimes it’s possible to walk along the layers for kilometers and prove that it’s continuous.

        USGS Professional Paper 1713, Chapter 21

      relative ages of rocks 2
      • in cases where
      rock layers have been disturbed you might have to look for fossils and other clues to date the rocks.
    • unconformities develop when agents of erosion such as running water or glaciers remove rock layers by washing or scraping them away.
      • when layers have been turned upside down, it’s necessary to use other clues in the rock layers to determine their original positions and relative ages. a nonconformity occurs when metamorphic or igneous rocks are uplifted and eroded.

        Chapter 3:2 Relative Ages of Rocks

      relative ages of rocks 2 matching up rock layers — evidence used for correlation. science: geology, the environment, and the universeself-check quizzesunit 1: earth sciencechapter 1: the nature of sciencesection 1. clues help
      • determination of relative age is easy if the rocks haven’t been faulted or turned upside down..Section check 2 question 3 describe the differences between a disconformity and a nonconformity.

        What is Relative Dating? - Law of Superposition, Principles of

        up rock layers — evidence used for correlation
        • geologists often can match up, or correlate, layers of rocks over great distances..Section check 2 answer a disconformity begins with sedimentary rock layers that have missing layers due to erosion or a period of time during which there was no new deposition of sediment.
        relative ages of rocks 2

Chapter 21 section 21 2 relative age dating of rocks-Self-Check Quizzes

Science Flashcards

up rock layers — evidence used for correlation
  • geologists often can match up, or correlate, layers of rocks over great distances. relative ages of rocks 2
    • most rock sequences are incomplete—layers are missing..Section check 2 answer a disconformity begins with sedimentary rock layers that have missing layers due to erosion or a period of time during which there was no new deposition of sediment. clues help
      • determination of relative age is easy if the rocks haven’t been faulted or turned upside down.

        Compounding Sterile Preparations, 3rd Edition - Sample Chapter 21

      • this records a time when the rocks were exposed and eroded. this chapter:web linksstandardized test practicechapter testvocabulary eflashcardsproblem of the weeksection 1:The geological time scalesection 2:Relative-age dating of rockssection 3:Absolute-age dating of rockssection 4:Remains of organisms in the rock recordteacherproblem of the weekstudentweb linksstandardized test practicechapter testvocabulary eflashcardsproblem of the weeksection 1:The geological time scalesection 2:Relative-age dating of rockssection 3:Absolute-age dating of rockssection 4:Remains of organisms in the rock recordsearchsearch for:site preferences.
      • this records a time when the rocks were exposed and eroded.relative ages of rocks 2
        • because of this, the oldest rocks are at the bottom.:password:internet geolabstextbook resourcesonline student editionself-check quizzeschapter testswebquest projectsstandardized test practicescience bulletinsunit resourceschoose a unitunit 1unit 2unit 3unit 4unit 5unit 6unit 7unit 8chapter activitieschoose a chapterchapter 21chapter 22chapter 23chapter 24web linksstandardized test practicechapter testvocabulary eflashcardsproblem of the weeksection resourceschoose a sectionsection 1section 2section 3section 4teacherteacher forumvocabulary puzzlemakerteaching todayresearchstudentinternet geolabstextbook resourcesonline student editionself-check quizzeschapter testswebquest projectsstandardized test practicescience bulletinsunit resourceschoose a unitunit 1unit 2unit 3unit 4unit 5unit 6unit 7unit 8chapter activitieschoose a chapterchapter 21chapter 22chapter 23chapter 24teacherproblem of the weekstudentweb linksstandardized test practicechapter testvocabulary eflashcardsproblem of the weeksection resourceschoose a sectionsection 1section 2section 3section 4home.
        • unconformities develop when agents of erosion such as running water or glaciers remove rock layers by washing or scraping them away. check 2 question 1 according to the principle of superposition, what do you expect to find in the bottom layer of undisturbed rock?

The Evidence for Evolution

  • relative age determination doesn’t tell you anything about the age of the rock layers in actual years.
relative ages of rocks 2
  • geologists determine the relative ages of rocks and other structures by examining their places in a sequence. check 2 question 1 according to the principle of superposition, what do you expect to find in the bottom layer of undisturbed rock?
relative ages of rocks 2
  • erosion and weathering then wear down these tilted rock layers.

    USGS Professional Paper 1713, Chapter 21

    • another type of unconformity, called a nonconformity, occurs when metamorphic or igneous rocks are uplifted and eroded.
    relative ages of rocks 2
    • in cases where
    rock layers have been disturbed you might have to look for fossils and other clues to date the rocks.: clues to earth’s past table of contents section 3: absolute ages of rocks section 1: fossils section 2: relative ages of rocks. science: geology, the environment, and the universeself-check quizzesunit 1: earth sciencechapter 1: the nature of sciencesection 1.

relative ages of rocks 2
  • sometimes it’s possible to walk along the layers for kilometers and prove that it’s continuous. relative ages of rocks 2
    • most rock sequences are incomplete—layers are missing.
    relative ages of rocks 2 matching up rock layers — evidence used for correlation.
relative ages of rocks 2 relative ages of rocks 2
  • erosion and weathering then wear down these tilted rock layers.:password:internet geolabstextbook resourcesonline student editionself-check quizzeschapter testswebquest projectsstandardized test practicescience bulletinsunit resourceschoose a unitunit 1unit 2unit 3unit 4unit 5unit 6unit 7unit 8chapter activitieschoose a chapterchapter 1chapter 2chapter 3chapter 4chapter 5chapter 6chapter 7chapter 8chapter 9chapter 10chapter 11chapter 12chapter 13chapter 14chapter 15chapter 16chapter 17chapter 18chapter 19chapter 20chapter 21chapter 22chapter 23chapter 24chapter 25chapter 26chapter 27chapter 28chapter 29chapter 30chapter 31teacherteacher forumvocabulary puzzlemakerteaching todayresearchstudentinternet geolabstextbook resourcesonline student editionself-check quizzeschapter testswebquest projectsstandardized test practicescience bulletinsunit resourceschoose a unitunit 1unit 2unit 3unit 4unit 5unit 6unit 7unit 8chapter activitieschoose a chapterchapter 1chapter 2chapter 3chapter 4chapter 5chapter 6chapter 7chapter 8chapter 9chapter 10chapter 11chapter 12chapter 13chapter 14chapter 15chapter 16chapter 17chapter 18chapter 19chapter 20chapter 21chapter 22chapter 23chapter 24chapter 25chapter 26chapter 27chapter 28chapter 29chapter 30chapter 31home. according to the principle of superposition, in undisturbed layers of rock, the oldest rocks are on the bottom.

relative ages of rocks 2
  • sedimentary rocks are then deposited on top of this erosion surface. a nonconformity occurs when metamorphic or igneous rocks are uplifted and eroded.:password:internet geolabstextbook resourcesonline student editionself-check quizzeschapter testswebquest projectsstandardized test practicescience bulletinsunit resourceschoose a unitunit 1unit 2unit 3unit 4unit 5unit 6unit 7unit 8chapter activitieschoose a chapterchapter 1chapter 2chapter 3chapter 4chapter 5chapter 6chapter 7chapter 8chapter 9chapter 10chapter 11chapter 12chapter 13chapter 14chapter 15chapter 16chapter 17chapter 18chapter 19chapter 20chapter 21chapter 22chapter 23chapter 24chapter 25chapter 26chapter 27chapter 28chapter 29chapter 30chapter 31teacherteacher forumvocabulary puzzlemakerteaching todayresearchstudentinternet geolabstextbook resourcesonline student editionself-check quizzeschapter testswebquest projectsstandardized test practicescience bulletinsunit resourceschoose a unitunit 1unit 2unit 3unit 4unit 5unit 6unit 7unit 8chapter activitieschoose a chapterchapter 1chapter 2chapter 3chapter 4chapter 5chapter 6chapter 7chapter 8chapter 9chapter 10chapter 11chapter 12chapter 13chapter 14chapter 15chapter 16chapter 17chapter 18chapter 19chapter 20chapter 21chapter 22chapter 23chapter 24chapter 25chapter 26chapter 27chapter 28chapter 29chapter 30chapter 31home.
    • if the same types of fossils were found in the limestone layer in both places, it’s a good indication that the limestone at each location is the same age, and therefore, one continuous deposit.