Lecture_19_Cretaceous_Warmth

Lecture_19_Cretaceous_Warmth - 1 1 Housekeeping Honor code...

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Unformatted text preview: 1 1 Housekeeping Honor code Midterm Exam 2 Mean: 73 Standard dev: 13 Extra credit assignment Final Exam 2 2 3 Evidence for Mid-Cretaceous (100 mya) Warmth 1) Land Fossils: Ferns and Crocodiles in Siberia, dinosaurs from Alaska - north of Arctic circle 2) Distribution of coal and evaporite deposits 3) High sea level- may reect small or non-existent glaciers. 3) Oxygen isotope ratios in carbonate shells 4 T>14C, Freezing is rare Crocodilians above Arctic Circle 3 5 6 4 7 8 5 9 Which of the following statements about the Cretaceous is not evident from the rock record 1. It was warmer than today near the poles 2. It was warmer than today at temperate latitudes 3. The tropics were much warmer than today 4. Warm fauna and flora were found at higher latitudes than today 10 6 11 High sea-level 12 Completely melting Greenland and Antarctica raises sea level by 70 m 7 13 14 Cretaceous 8 15 16 9 17 18 Planktonic foraminifera 10 19 Benthic foraminifera 20 Cold, dense water sinks at high latitudes, filling the deep ocean 11 21 18 O .4 %, 16 O 99.6 % When shells form they discriminate against the 18 O....
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Lecture_19_Cretaceous_Warmth - 1 1 Housekeeping Honor code...

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