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.
WHO'S ON FIRST? RELATIVE DATING (Student Activity)
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? State the law of superposition.
How does this activity relate to the law of superposition? Relative dating is occasionally more difficult because rock layers have been disturbed. What forces could cause a disturbance of rock layers? Examine the fossil samples. What were these fossilized organisms? The Earth is about 4. My presentations Profile Feedback Log out.
Lab 8--Relative Dating
Auth with social network: Registration Forgot your password? Download ppt "Geologic time Relative dating". Determining Relative Age Chapter 8. Age of the Earth Objective: This mindset was based on biblical references. About project SlidePlayer Terms of Service. 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.
Geologic time Relative dating - ppt video online download
All of the fossils represented would be found in sedimentary rocks of marine origin. Figure 2-A gives some background information on the individual fossils. The letters on the other cards have no significance to the sequencing procedure and should be ignored at this time. 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 in the rock stratum.
Keep in mind that extinction is forever. Once an organism disappears from the sequence it cannot reappear later.
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Use this information to sequence the cards in a vertical stack of fossils in rock strata. Arrange them from oldest to youngest with the oldest layer on the bottom and the youngest on top. This will enable your teacher to quickly check whether you have the correct sequence.
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Three-lobed body; burrowing, crawling, and swimming forms; extinct NAME: Many were large a few rare species were 5 feet in length ; crawling and swimming forms; extinct NAME: Primitive form of chordate; floating form with branched stalks; extinct NAME: Jellyfish relative with stony Cnidaria calcareous exoskeleton found in reef environments; extinct NAME: Multibranched relative of starfish; lives attached to the ocean bottom; some living species "sea lilies" NAME: Primitive armored fish; extinct NAME: Shelled, amoeba-like organism NAME: Snails and relatives; many living species NAME: Clams and oysters; many living species NAME: 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.
Explore this link for additional information on the topics covered in this lesson: Although most attention in today's world focuses on dinosaurs and why they became extinct, the world of paleontology includes many other interesting organisms which tell us about Earth's past history. The study of fossils and the exploration of what they tell scientists about past climates and environments on Earth can be an interesting study for students of all ages.