Recent paleoenvironmental reconstructions suggest that the earliest members of the hominin lineage evolved in woodlands along both rivers and lakes.
A fossil index is a piece of paleontological or archaeological evidence that can be used to roughly date the stratigraphic unit in which it was discovered because it is unique or indicative of a certain time in geological history, the Prehistoric period, or a particular paleoenvironment.
Generally speaking, the species or cultural modes that gave rise to the guide fossils had a very brief lifetime on a geological or historical scale, which means that their presence is restricted to extremely specific temporal or cultural coordinates, in the case of prehistoric societies. In other words, if a guide fossil is found in a strata, that stratum may be precisely dated.
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