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To explain:
The site out of x, y, and z, which would be added to refine the boundary, between Silurian period and Ordovician period on the map given below.
Given:
Table 1 given below shows the ratio between the 206Pb and 238U and the estimated age of the sites given.
Introduction:
According to the data given in tables and radioactive isotope dating, the sites formed during the Ordovician and Silurian periods of the geological timescale are given as below:
Site 1, 2, 4, 5, 8, 9, and 10 were formed during the Ordovician period of the Palaeozoic era having estimated age from 443.7 to 488.3 million years ago
Site 3 and 6 were formed during the Silurian period of the Palaeozoic era having estimated age from 416 to 443 million years ago.
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Chapter 24 Solutions
EBK LIFE: THE SCIENCE OF BIOLOGY
- Which item is best dated using the potassium-argon (K-Ar) method? Group of answer choices A: Cave layers in South Africa B: stone tools C: Ancient dinosaur bones D: organic materials E: Lava flows found in the Olduvai Gorgearrow_forwardA fossil is found to contain the radioactive parent and daughter isotopes uranium 235U, and lead 207Pb, in the ratio 12.5% to 87.5%. Assuming that no 207Pb was present when the fossil first formed, estimate the age of this sample.Please show some thought process and a therefore statement. Thank you very much, have a great day!arrow_forwardSuppose a scientist finds a rock with an interesting fossil. Curious to know the age of the fossil, she takes the rock to a lab. The lab determines the amount of rubidium (Rb) and strontium (Sr) in the rock. The scientist is familiar with radiometric dating and knows that she can now calculate the age of the rock, 1, using an isochron. The Rb-Sr isochron equation is 87. Rb. [edr – 1] 86 °Sr. 87 87 Sro 86 Sro 86 Sr. 87. Rb 3.807 and 89.60. In a published table, she finds that Using the lab's values, she calculates the isotope ratios as 86 Sr. 87 = 0.7129. She also finds that the decay constant, 86 the ratio of strontium-87 to strontium-86 at the formation of the rock was Sro 2, for rubidium-87 is 1.42 x 10-11. Use the equation and provided data to calculate t. Put your answer in scientific notation and round to the nearest tenth. years x10 What is the approximate age of the rock in billions of years? Round to the nearest tenth. billions of years t =arrow_forward
- Radiometric dating uses the decay of to to determine how old fossils of biological material are using the rate of decay. Group of answer choices 14C, 12C 14N, 12C 12C, 14N 14C, 14Narrow_forwardA paleontologist estimates that when a particular rock formed, it contained 12 mg of the radioactive isotope potassium-40. The rock now contains 3 mg of potassium-40. The half-life of potassium-40 is 1.3 billion years. From this information, you can conclude that the rock is approximately ______________ billion years old.arrow_forwardGive two lines of evidence supporting the asteroid impact hypothesis for the Cretaceous extinctions.arrow_forward
- Which parent isotope is most useful for dating samples that are greater than 100 million years old? a potassium-40 b lead-206 c argon-40 d uranium-238arrow_forwardGive 1 reason from the reading that shows that there are no life forms on Venus.arrow_forwardList several significant events in the history of life on earth that are associated with the K-T Boundary.arrow_forward
- Match the reliable age range of the right with the appropriate technique on the left. Thermoluminescence [ Choose] Choose] Ages greater than 1,000 years ago. Ages between 1,000 years ago and 600 kya. Ages greater than 100 kya Ages between 300 BP and 300 kya. Ages between 0- 50 kya. [Choose ] Uranium-Thorium K-Ar (Potassium-Argon) Fission Track [ Choose ] Radiocarbon (14C) [Choose ]arrow_forwardPart 1. Stratigraphic Dating: A Café Scene Relative dating methods establish the date of something as older or younger than something else rather than anchoring its age to an absolute, scaled timeline, as in absolute dating. So, we determine the sequence of at least two things (two events, two deposits, etc.) and establish what happened first, what happened next, and so on. In archaeology, relative dating relies on stratigraphy—what material is located above or below something else. The Law of Superposition tells us that material positioned underneath something else is usually older and material overlying a deposit is younger than the deposit, unless the layers have been disturbed. The photos that you will be shown depict a collection of items on a table: a cup, saucer, newspaper, and tickets. Imagine that these items are part of a single context such as a layer in an excavation and you want to determine whether they were deposited all at once as a single event or one after the other…arrow_forwardVolcanic ash can be used to date fossil finds because each time it is expelled by an eruption it has the same relative proportions of radioactive isotopes. True or Falsearrow_forward
- Biology Today and Tomorrow without Physiology (Mi...BiologyISBN:9781305117396Author:Cecie Starr, Christine Evers, Lisa StarrPublisher:Cengage Learning
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