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Gurmeet Singh posted an Question
December 13, 2020 • 16:25 pm 30 points
  • IIT JAM
  • Geology (GG)

28. a sedimentary rock included fossils of twoo species that are known to have lived between 480-430 and 450-250 million years ago. what acould be the age of th

28. A sedimentary rock included fossils of twoo species that are known to have lived between 480-430 and 450-250 million years ago. What Acould be the age of the rock? A. 445 million years B. 480 million years C. 250 million years D. 410 million years (DU-2015)

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  • Gurmeet singh

    but sir why we are not choosing as oldest fossil as best indicator of age of rock. means why interval, if we have more older data i.e. 480 Byrs

    eduncle-logo-app

    because both the fossil are present in the stata and we take the common age....480 we don't take because that is the range of Fossil not the rock... we are considering both Fossil range common part to know the range.

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    Rahul kumar best-answer

    Answer (a) 445 million years If the sedimentary rocks contain two fossils of different age range then that sedimentary rocks must had formed when both the fossils survived. By looking at the given age ranges it can be found that both fossils simultaneously lived during 450 - 430 million years ago. So, the sedimentary rocks should be of age between 450 - 430 million years. There is only one option (445 million years) lies in this range, so the correct answer should be 445 million years.

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