GEOLOGY
PALEONTOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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younger
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older
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Either A or B
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None of the above
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Detailed explanation-1: -Stromatolites are the oldest known fossils, representing the beginning of life on Earth.
Detailed explanation-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.
Detailed explanation-3: -Since the rock formation contains both types of fossils the ago of the rock formation must be in the overlapping date range of 415 to 420 million years. Studying the layers of rock or strata can also be useful. Layers of rock are deposited sequentially.
Detailed explanation-4: -The bottom layer of rock forms first, which means it is oldest. Each layer above that is younger, and the top layer is youngest of all. This ordering is relative because you cannot be sure exactly when each layer formed, only that each layer is younger then the one below it.