A lava flow radiometrically dated at 300 million years lies just below sedimentary layer A and just above sedimentary layer B. What can be said of the ages of beds A and B?
[Ques. 2] Wood from an ancient stump has a ratio of carbon-14 to carbon-12 that is one-eighth that of new wood. About how old is the stump? (Carbon-14's half-life is 5730 years.)
[Ques. 3] Sedimentary layer A lies above sedimentary layer B. Fault C cuts through B but does not affect A. Arrange A, B, and C in order of oldest first to youngest last.
[Ques. 4] A dike that intrudes a bed of sedimentary rock is ______________ than the sedimentary rock.
Fill in the blank(s) with correct word
[Ques. 5] Layers of sediment, lava, and ash are originally laid down in a(n) ______________ position.
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[Ques. 6] Sea lilies are more scientifically called ______________.
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[Ques. 7] The Cenozoic era consists of the Tertiary and ______________ periods.
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[Ques. 8] The Eocene is a geologic______________.
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[Ques. 9] The K-T event occurred about ______________ million years ago.
Fill in the blank(s) with correct word
[Ques. 10] The finding of an abnormally high concentration of the element named ______________ was the first clue to the probable cause of the K-T event.
Fill in the blank(s) with correct word
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