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Q1. A sequence of rocks consists of the stratigraphic layer A at the bottom, layer B...

Q1. A sequence of rocks consists of the stratigraphic layer A at the bottom, layer B above it, and layer C at the top.

a.Layer A has been dated on the basis of having 1/2 of the original U-235 (the rest being converted to Lead-207 through radioactive decay) to be ________________ Ma old. (hint: Ma - millions of years)

b. Layer C has been dated on the bases of fossils to be early Cambrian in age. How old is it in Ma __________? (hint: use geologic time scale)

c. What is the age range of layer B in Ma: from ____________ Ma to _____________ Ma

d. What Principle of Stratigraphy were you mainly applying in answering Q3 ________________________

science   Earth-Sciences   
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Answer #1

Answer:

a. The answer is: 700. Explanation: The half life of U-235 is 700 million years.

b. The answer is: 543. Explanation: Cambrian period started from 543 Ma and till 520 Ma, it was Early Cambrian.

c. The answer is: 543, 520. Explanation: Cambrian period started from 543 Ma and till 520 Ma, it was Early Cambrian.

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