Once you finish answering the questions, you'll get your quiz score automatically. Get more information about this aspect of geology with the lesson called Relative Dating with Fossils: Index Fossils as Indicators of Time. This lesson will help you:. The videos on Study. Students in online learning conditions performed better than those receiving face-to-face instruction. Explore over 4, video courses. Find a degree that fits your goals.
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What kind of dating can we establish with the principle of fossil succession? Print Relative Dating with Fossils: Index Fossils as Indicators of Time Worksheet. Create your account to access this entire worksheet. Create an account to get started Create Account. Type of dating used with fossil succession What an index fossil represents Comparing fossils from lower and upper layers How to match up two outcrops of fossils Good and bad traits of index fossils Skills Practiced Interpreting information - verify you can read information about fossil succession and correctly interpret what kind of dating can be established based on it Reading comprehension - ensure that you draw the most important information from the related index fossil lesson Knowledge application - use what you've learned to identify a characteristic that would not be beneficial for an index fossil Additional Learning Get more information about this aspect of geology with the lesson called Relative Dating with Fossils: This lesson will help you: Understand how relative dating sheds light on a geological time scale Explain how scientists make the story of our history more complete Identify who the first person was to understand the principle of fossil succession Appreciate how an index fossil can act as a missing link.
You are viewing lesson Lesson 8 in chapter 2 of the course:.
Review of Relative Dating
Earth Science 24 chapters lessons 16 flashcard sets. Earth's Spheres and Internal Rock Deformation and Mountain Water Balance on Earth. Once students begin to grasp "relative" dating, they can extend their knowledge of geologic time by exploring radiometric dating and developing a timeline of Earth's history. These major concepts are part of the Denver Earth Science Project's "Paleontology and Dinosaurs" module written for students in grades The module is an integrated unit which addresses the following National Science Education Standards: Fossils indicate that many organisms that lived long ago are extinct.
Extinction of species is common; most of the species that have lived on the earth no longer exist. Fossils provide important evidence of how life and environmental conditions have changed.
Dating Fossils – How Are Fossils Dated?
The complete "Paleontology and Dinosaurs" module takes approximately four weeks to teach. The "Who's On First? Scientific measurements such as radiometric dating use the natural radioactivity of certain elements found in rocks to help determine their age. Scientists also use direct evidence from observations of the rock layers themselves to help determine the relative age of rock layers.
Specific rock formations are indicative of a particular type of environment existing when the rock was being formed. For example, most limestones represent marine environments, whereas, sandstones with ripple marks might indicate a shoreline habitat or a riverbed. Return to top The study and comparison of exposed rock layers or strata in various parts of the earth led scientists in the early 19th century to propose that the rock layers could be correlated from place to place.
Locally, physical characteristics of rocks can be compared and correlated. On a larger scale, even between continents, fossil evidence can help in correlating rock layers. The Law of Superposition, which states that in an undisturbed horizontal sequence of rocks, the oldest rock layers will be on the bottom, with successively younger rocks on top of these, helps geologists correlate rock layers around the world.
This also means that fossils found in the lowest levels in a sequence of layered rocks represent the oldest record of life there. By matching partial sequences, the truly oldest layers with fossils can be worked out. By correlating fossils from various parts of the world, scientists are able to give relative ages to particular strata. This is called relative dating. Relative dating tells scientists if a rock layer is "older" or "younger" than another. This would also mean that fossils found in the deepest layer of rocks in an area would represent the oldest forms of life in that particular rock formation.
In reading earth history, these layers would be "read" from bottom to top or oldest to most recent. If certain fossils are typically found only in a particular rock unit and are found in many places worldwide, they may be useful as index or guide fossils in determining the age of undated strata. By using this information from rock formations in various parts of the world and correlating the studies, scientists have been able to establish the geologic time scale. This relative time scale divides the vast amount of earth history into various sections based on geological events sea encroachments, mountain-building, and depositional events , and notable biological events appearance, relative abundance, or extinction of certain life forms.
When you complete this activity, you will be able to: The first card in the sequence has "Card 1, Set A" in the lower left-hand corner and represents the bottom of the sequence.
Law of Superposition
If the letters "T" and "C" represent fossils in the oldest rock layer, they are the oldest fossils, or the first fossils formed in the past for this sequence of rock layers. Now, look for a card that has either a "T" or "C" written on it. Since this card has a common letter with the first card, it must go on top of the "TC" card. The fossils represented by the letters on this card are "younger" than the "T" or "C" fossils on the "TC" card which represents fossils in the oldest rock layer.
Sequence the remaining cards by using the same process. When you finish, you should have a vertical stack of cards with the top card representing the youngest fossils of this rock sequence and the "TC" card at the bottom of the stack representing the oldest fossils.
WHO'S ON FIRST? A RELATIVE DATING ACTIVITY
Starting with the top card, the letters should be in order from youngest to oldest. Return to top Procedure Set B: Each card represents a particular rock layer with a collection of fossils that are found in that particular rock stratum. All of the fossils represented would be found in sedimentary rocks of marine origin.