Carver AP Biology Monday 2/6 Homework

NOTE: BRING BOOK TO CLASS TUESDAY.

On the clock diagram given out in class, mark the following events taken (mostly) from the Timeline of Natural History pages.  Write small and use a sharp pencil.  When events are too closely-spaced to fit, write in the margin and at least show the approximate location and the chronological order of events.

1. 4,450mya earliest crust, surface cool enough for oceans
2. 3,920-3,850mya  late heavy bombardment of moon (& prob earth)
3. 3,850mya C enrichment of rock characteristic of  photosynthetic life
4. 3,800mya oldest banded iron formations
5. 3,500mya fossils resembling cyanobacteria
6. 2,700mya biomarkers of cyanobacteria & steranes associated with eukaryotes; chemical evidence of small rise in atmospheric O2
7. 2,500mya  banded irons form
8. 2,400mya  Huronian Glaciation begins
9. 2,200mya  iron content of fossils shows O2 building up to 5-18% of modern levels
10. 2,100mya  Huronian glaciation ends; earliest eukaryote fossils, earliest multicell organisms
11. 850mya-635635mya  “Snowball Earth” 3 times
12. 575mya Ediacaran fossils
13. 555mya first possible mollusks
14. 550mya first jellies, sponges, corals, anemones
15. 544mya  “small shelly fauna”
16. 505mya  Cambrian “Explosion” recorded in Burgess Shale
17. 444  Mass Extinction “#1”
18. 420mya  first (small) vascular land plants, first land animals (millipedes, scorpions)
19. 400mya  first insects
20. 395mya  first tetrapods, other modern groups
21. 370mya  trees, forests
22. 365mya  Mass Extinction “#2” (?)
23. 315mya  first reptiles
24. 251mya  Great Permian Extinction (Mass Extinction “#3”)
25. 200mya  End Triassic Extinction  (Mass Extinction “#4”)
26. 155mya  first birds
27. 130mya  first flowering plants; Laurasia & Gondwana begin to split
28. 65mya  Cretaceous-Tertiary (K-T) Extinction  (Mass Extinction “#5”)
29. 60mya  first primates and miacids (small weasel-like arboreal mammals)
30. 55mya  “island” Indian collides with Asia, raising Tibetan Plateau, Everest
31. 50mya  primates radiate, Africa collides with Eurasia, 49mya  whale ancestors return to water
32. 35mya  first grasslands
33. 5.4mya-6.3mya  subtribe Hominina
34. 2.5mya  first species of genus Homo
35. Today: Mass Extinction  “#6” ???