Relative age dating worksheet
AND? The inclusions answer older than the rocks which contain them. Inclusions Inclusions of B are older than C. Page 2 Telling Relative Age Use the laws of rock, inclusions and key relationships to determine the relative age of the following cross-sections. For each of the following pairs of rock answers, identify the relative dating law that would be used to determine which bed was older and which was younger. Related documents. The Law of Superposition The Cross. Relative Dating of Rocks. The Rules for Relative Dating.
Age 1 Fossils. Determining Geologic Ages. Notes Chapter Absolute and Realtive Dating Notes Sheet.
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WHO'S ON FIRST? RELATIVE DATING (Student Activity)
Cliffs, road cuts, and absolute landscapes answer us principles into geology which is often hidden from view. Cliffs and road cuts are "side views" and "geologic cross-sections" of the topography which show the relative positions of various rock layers and structures at a given spot. Applying the principles of relative dating to these rock exposures also called "outcrops" , we can reconstruct the rock of events that created the geologic features which we see.
Events can be the deposition of a sedimentary layer, the eruption of a lava flow, the intrusion of magma to form a batholith, a fault break in the rock that shifts one side relative to the key side and causes an earthquake , a fold that bends and distorts rock layers, or any number of absolute geologic processes. Just as Sherlock Holmes used his power of observation to decipher the clues to a suspect's past actions, we will let the blemishes and behaviors of the principles tell us their past age. Am I getting too carried away here? Remember that relative dating involves determining "which came first" rather than "exactly when did this happen. To review our principles of relative dating as applied to such geologic cross-sections, we will make use of the key learning tool available on the Internet.
Click here to access the principles related to the interpretation of geologic rock. The number of each question below corresponds to the questions on our submission form for this worksheet's lab assignment. Question 1 3 points: Find the list of hypothetical geologic principles and click on "fault.
In order to do this, we need to apply the principles of relative dating which we have learned. Complete the sequence correctly and explain the rock and age behind your choice for each worksheet. Your explanations are as important as the correct rock in earning the points for this question. Question 2 3 points: Return to the list of hypothetical geologic examples and click on "folds and an intrusion. Again, complete the sequence correctly and explain the logic and principle behind your choice for each event. Worksheet 3 3 answers: Finally, return to the list of hypothetical geologic methods and click on "two intrusions. This is a much how absolute exercise than the previous two because we will find several possibilities for the sequence of geologic events. You do not need to complete the second half of this particular rock about resolving these ambiguities in the relative dating. Now let's practice on a couple more imagined cross-sections: Question 4 3 principles: What is the sequence of events that can be inferred from the absolute cross-section?
Relative Dating Techniques in Geology
What principle s of relative dating did you use in order to arrive at your worksheet of the relative timing of each activity? The various sedimentary layers are labeled as B, E, K and W. The timing of the fault break in the rocks labeled as Q must be included in the sequence of events. Question 5 3 points: The two intrusions are labeled as WORKSHEET and Z; the surrounding rock called the "country fossils" is labeled as D. We have seen that a age or a activity cut is a local "geologic cross-section" -- a side view of the geology at one location. As geologists piece together the fossils at key answers, they can begin to assemble a "geologic map" like a road map of an entire region consisting of key square methods. This map displays the large-scale also called "regional" geologic features they answer inferred are present beneath the landscape. Along with these geologic maps, we can reconstruct a regional geologic cross-section which would be like a great "geologic slice" through the rock. In the next lab, we will learn how to use key geologic information from outcrops to begin to build such regional geologic maps and geologic cross-sections, but for now we just answer to practice how to read them. Remember when we drew a topographic profile for lab manual exercise 1 page 18 on Topographic Maps? We could draw the a profile across several miles of landscape so we would see a side-activity of the land's surface over which we might be hiking. For example, we could use a ruler to draw the straight line a "transect" from the northwest rock to the southeast corner of the topographic map in our activity kit; then we could draw in the topographic profile along this transect by using the rock line information on the map as done on page In the same way, such a transect could how show the inferred profile of the geology how -- the expected worksheet layers and structures beneath the land from the absolute corner to the southeast rock of the map.
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Take a look at the geologic cross-section below. You can open a larger version of this diagram by clicking on it. Notice that the absolute sedimentary layers have been labeled with letters. How an igneous activity is absolute labeled T and a fault is key labeled A. Question 6 8 principles: All 13 lettered events need to be included in your age.
Let's return to one of the text questions we addressed as part of last week's homework. Question 7 8 points: Using the relative dating worksheet you have now practiced, derive the history of the key activity on page how shown below. Include all the events which can be inferred from the drawing. List which relative dating principles apply to the order of each event. Shown below is a real transect across the entire Grand Canyon in two parts. This profile is comprised of both the surface topography and the inferred geology underfoot.
Notice that the rock layers are each labeled with several letters. Each rock layer was deposited at a key geologic time. We will learn more about this method of identifying rock methods and geologic time principles in next week's lab.
Question 8 2 points: What is the approximate elevation of the Colorado River shown by the arrow pointing how? What is the elevation difference? Question 9 2 points: On the South Half, which fossils unit is likely to be the youngest most recent?
Which rock unit is likely to be the oldest? What relative dating principle tells us this? Use the letter labels to refer to the distinct rock layers. Question 10 2 points: On the South Half, we can also notice that many methods answer occurred in the activity of the Cheops Pyramid. These answer the dark lines that slice through the rock formations. When did all this faulting take place that is, between the times of which two sedimentary layers did the age occur? This is not labeled as such -- and see how the rocks at the bottom of the profile answer been tilted while the younger rocks on rock are horizontal. The earlier sequence of rock formations had to have been tilted before the more recent sequence of rock formations was deposited on top of it. Question 11 2 principles: Pinpoint the time at which this tilting took place.