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109 EAS MIDTERM 2006 (Please circle which day this is (not necessarily your normal lecture day) Age (Ga) Eon 0 Age (Ma) Era Period Quaternary 0 0 Neogene Paleogene 0 65 144 Part I. Please answer your choice of five of the following, indicating the most nearly appropriate time using the boldface numbers 0-13,700 on the time scale, as in the example below. (10 points, two for each). Ample allowance will be made where close calls are a possibility. No indications to the contrary, the first five you answer will be the ones counted. x. Cretaceous-Tertiary boundary a. Earliest known forests b. Earliest known vertebrates c. Earliest known predatory vertebrates d. Earliest known terrestrial vertebrates e. Earliest known sauropsids ( reptiles) f. Earliest known saurischians g. Earliest known ornithischians h. Earliest sauropods known most nearly ______ most nearly ______ most nearly ______ most nearly ______ most nearly ______ most nearly ______ most nearly ______ most nearly ______ most nearly ______ 543 100 Cretaceous Jurassic 1 200 Triassic Permian 300 Pennsylvanian Mississippian 202 251 285 358 405 Devonian 2 Silurian Ordovician 2500 Cambrian 505 543 3 1 Ma = 1 million years 1 Ga = 1 billion years i. Earliest known birds most nearly ______ ---------------------------------- Limit for Wednesday (a i) ------j. The "Big Bang" most nearly ______ k. Earliest known evidence of life most nearly ______ --------------------------------- Limit for Thursday (a k) ---l. Earliest known chordates most nearly ______ m. Earth's formation most nearly ______ ---4 4000 pre-Hadean 13,700 -- 4570

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