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Using Fossils in Relative Dating
Answer the Following Questions:
1.) Which fossils would you expect to find in a rock that is 405 million years old?
Suppose you find a rock with a goniatite fossil and another rock with an ammonite fossil? 2.)Which rock
is older? How do you know?
3.)Which organism would make the best index fossil? Why?
4.)If you find a rock that has both a nautilus and a goniatite fossil, about how old is the rock? How do you
know?
5.)If you find a rock that has a belemnite fossil in it, how old is the rock
rock that can help you answer Instructions: Study the images and then answer the questions that follow
Ammonite, lived 205-66 million years ago (mya) Belemnite, lived 205-66 mya
Ceratites, lived 205-138 mya Nautilus, lived 410 mya to present
Teuthids, lived 410 mya to present Goniatite, lived 360 to 290 my

Sagot :

kimtae103737

Answer:

  1. The Ammonite would be best for a fossil index because it is the youngest and the most common to find, therefore will be easier to explore and examine the timeline/life of the once live fossil.
  2. To establish the age of a rock or a fossil, researchers use some type of clock to determine the date it was formed. Geologists commonly use radiometric dating methods, based on the natural radioactive decay of certain elements such as potassium and carbon, as reliable clocks to date ancient events.
  3. A good index fossil is one with four characteristics: it is distinctive, widespread, abundant, and limited in geologic time. Because most fossil-bearing rocks formed in the ocean, the major index fossils are marine organisms.
  4. The rock will be old between 360 and 290 million years . Explanation: if we have fossils from both Nautilus and goniatite in the same rock layers ,then we can look at the periods in which these two animals lived as a clue about the ages of the rocks ,thus the animals themselves as well.

Explanation:

sorry I don't know the answer of question no. 5..

alexanderorangeguy

Answer:

Look in explaination

Explanation:

1) You would expect to find a Nautilus fossil or a Thethids fossil. This is because they are the oldest and come before 405 million years ago. None of the other come before this date.

2) The Goniatite fossil will be the oldest. This is beacuse the creature went extinct 290 mya. The Ammonite wasn't even a species at this point.

3) A Goniatite will have the best index. This is beacuse it had a short lifetime. Only 70 million years, which compared to the others, isn't long.

4)You will know the rock is 360 to 290 million years old. This is because Nautilis were born before Goniatite and are still around today. Goniatite on the other hand, only lived from 360 - 290 mya.

5) You will know that it is within 205-66 million years ago. This is because this is when the species was around. To get a more acturate result, you may want to use carbon dating to determine a precise age.

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