| It is biogeochemistry that lends substance to the hypothesis that Ediacaran and Cambrian faunas are separated by mass extinction. |
| With the specific exception of river margin faunas, the more fussy hygrophilous species are well represented in Ireland. |
| Floras and faunas from these beds have been discussed, but the remains of small vertebrates have received little attention. |
| Furthermore, trilobite faunas in the Early Cambrian were already differentiated biogeographically. |
| Perhaps the reason is that social bees, which are largely opportunistic, dominate pollinator faunas in northern regions. |
| The Ordovician faunas described herein represent both the Midcontinent and Atlantic faunal realms. |
