Table 3.
χ2 analysis of frequency counts of extinct genera, by NALMA and by the number of species within genera
| One species recognized | Two+ species recognized | Total | |
| Rancholabrean to the end of the Pleistocene | 5 (2.072) | 1 (−2.072) | 6 |
| Irvingtonian to the end of the Pleistocene | 7 (0.814) | 6 (−0.814) | 13 |
| Blancan to the end of the Pleistocene | 5 (−2.283) | 14 (2.283) | 19 |
| Total | 17 | 21 | 38 |
Calculated adjusted residuals are in parentheses, significant values are in bold (data from Table 2). χ2 = 6.659, df = 2, P = 0.036.