Upon What Basis Were the Upper and Lower Boundaries of the Mesozoic

question 114

Multiple Choice

Upon what basis were the upper and lower boundaries of the Mesozoic Era defined?

• A) dramatic changes in the color of the rocks from green to tan
• B) major episodes of mountain building
• C) abrupt changes in the types of fossils, representing mass extinctions
• D) the discovery that a meteoroid impact may have killed the dinosaurs

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