assignment
| Students: fill in the yellow boxes. | ||||||
| 1. | Age (years ago) | Right coiling Neogloboquadrina pachyderma | Left coiling Neogloboquadrina pachyderma | Total number Neogloboquadrina pachyderma | % Right coiling Neogloboquadrina pachyderma | % Left coiling Neogloboquadrina pachyderma |
| 230 | 50 | 280 | 82% | 18% | ||
| 10,000 | 220 | 75 | 295 | 75% | 25% | |
| 20,000 | 70 | 230 | 300 | 23% | 77% | |
| 30,000 | 45 | 300 | 345 | 13% | 87% | |
| 40,000 | 50 | 302 | 352 | 14% | 86% | |
| 50,000 | 65 | 389 | 454 | 14% | 86% | |
| 60,000 | 20 | 140 | 160 | 13% | 88% | |
| 70,000 | 56 | 287 | 343 | 16% | 84% | |
| 80,000 | 63 | 267 | 330 | 19% | 81% | |
| 90,000 | 212 | 56 | 268 | 79% | 21% | |
| 100,000 | 120 | 23 | 143 | 84% | 16% | |
| 110,000 | 87 | 45 | 132 | 66% | 34% | |
| 120,000 | 203 | 66 | 269 | 75% | 25% | |
| 130,000 | 56 | 205 | 261 | 21% | 79% | |
| 140,000 | 45 | 332 | 377 | 12% | 88% | |
| 150,000 | 89 | 135 | 224 | 40% | 60% | |
| 160,000 | 123 | 166 | 289 | 43% | 57% | |
| Table:1 | ||||||
2. Holucene epoch
3. According to the coiling direction of the sampled forums, the temperature was warmer in 110000 and cooler in 145000.
