Refer to the Figure, Which Shows an Imaginary Name Scheme

question 23

Multiple Choice

Refer to the figure, which shows an imaginary name scheme for an undisturbed site with distinct fossil assemblages in the top five layers of strata. Your research team is excited to find (through comparison with other sites around the globe) that these assemblages correspond to some of the known historical periods on Earth.Specifically, the "Leverett" assemblage contains only microscopic life forms, while the "Hadley" stratum contains diverse marine invertebrate animals but no evidence of terrestrial life.Based on this information, which eon in Earth's history contains the "Hadley" stratum?

• A) Phanerozoic
• B) Hadean
• C) Archaean
• D) Proterozoic
• E) Precambrian

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Definitions:

Transparent Outer Membrane

Refers typically to the cornea, the clear, dome-shaped surface that covers the front of the eye and contributes to the eye's focusing power.

Focus

Concentration or attention directed towards a specific object, task, or thought.

Depressed Spot

A concave area or indentation on a surface, which can be physical like on the skin or structural in other materials.

Retina

A layer at the back of the eyeball containing cells that are sensitive to light and that trigger nerve impulses that pass via the optic nerve to the brain, resulting in visual perception.