Relative Dating Lab
9 Lessons in Chapter Geologic Time & Relative Dating The geologic time scale is an essential tool for understanding the history of Earth and the evolution . radiometric dating (DE pgs. ) geologic time scale (DE pgs. Earth Science Lab: Relative Dating - lukonin.info 3/16 Make a list of the. the geologic time scale. • Explain how relative and absolute dating together form the basis of our modern understanding of Earth history. • Discuss how the vast.
Any geologic feature that cuts across another geologic feature is younger.
Relative and absolute ages in the histories of Earth and the Moon: The Geologic Time Scale
Unit 5 or Unit 6? Which is older, the fault or volcanic layer? Volcanic layer fault Which is younger, the dike or country rock? Which is younger, the dike or country rock? Can you identify the inclusions found in this Sierra Nevada Mountain batholitic material?
Geologic Time Deciphering Earth History and Time Scale.
Older Younger 21 II this geology class. Explain the concept of relative dating. Draw a diagram, and explain each of the following dating principles: Units B and C because of original horizontality B.
Units E and F because of cross-cutting relations C. Units E and F because of inclusions principle D. Units B and A because of cross-cutting relations A. Units B and A because of cross-cutting relations 23 Ok — given the principles, what is wrong with this stratigraphic section? Active erosional processes shaping the surface A period of erosion creating the unconformity Continued deposition burying the erosional surface to create an angular unconformity 27 Grand Canyon Stratigraphy Types of Unconformities 28 II this geology class.
Geologic Time Deciphering Earth History and Time Scale. - ppt download
I will get an A on my exams and quizzes 5. Describe an unconformity and what what it represents regarding geologic what it represents regarding geologic history. Most organisms composed of soft parts. Organisms with hard parts and within a sedimentary environment are favored.
Very rare to see vast array of other life forms How do fossils help scientists relatively date layers of rock strata? Give 2 reasons why many organisms are not fossilized. Explain the law of fossil succession and how this law allows dating of strata. How has fossil succession helped geologists unravel earth history? Fossils discovered in lower sections of rock layers are younger than fossils above.
Most fossil soft parts are preserved. The age of fossils is marked by the preservation of all hard parts.
Fossils can be dated by using the principle of superposition. The principle of fossil succession states: Radiometric dating — applying a number radioactive atoms isotopes decay at a constant rate over time Review of the atom: U Pb Decays 37 Isotopes decay at a fixed rate.
Decay rate is measureable. Isotope decay is not influenced by weathering. One isotope will decay into another isotope. Radio active decay U Pb Alpha emission Mass reduced by 4 Atomic reduced by 2 Beta emission Mass remains unchanged Atomic increases by 1 38 How does radiometric dating work, and where does the age number come from? Define the following absolute dating terms: This would also mean that fossils found in the deepest layer of rocks would represent the oldest forms of life.
If certain fossils are found only in particular layers of rock, they may be useful as index fossils in determining the age of unknown rock layers.
By using the information from rock formations in various parts of the world and correlating the studies, scientists have been able to construct the geologic time scale. This time scale divides the vast amount of Earth history into sections based on geologic events such as mountain building and biologic events such as extinction. Spread the cards on the table. Let the cards represent rock layers and the letters represent fossils.
March 10 to 20 - Relative Dating and Geologic Change - Bright in Science
Determine the next card by comparing letters that overlap. Sequence the remaining cards by using the same process. Card set A analysis 1. List the cards from oldest to youngest without repeating letters. Examine the second set of cards with sketches of fossils. Each card represents a particular rock layer with a collection of fossils in that particular rock layer. The letters on the other cards have no significance and should not be used in sequencing.
Find a rock layer that has at least one of the fossils you found in the oldest rock layer. This rock layer would be younger as indicated by the appearance of new fossils. Card set B analysis 1. Use the letters to sequence the cards from oldest to youngest.
Which fossil organisms could possibly be used as index fossils? Which fossil organisms would probably not be used as index fossils?