Table 1.

Estimated parameters for each of the four successive terrestrial vegetative phases. The average height is a simple metric of differences in biomass and the rhizosphere depth. In addition, it is used to give a basic impression of the potential impact of changes associated with each of the successive floras

Vegetation phaseOrigination (Ma)Average height (cm)Rhizosphere depth (cm)
Lignophytes375–3855×10210–102
Tracheophytes423–42620.1
Thalloid Bryophytes513–5232×10−10.0
Microbial Mats2200–10001×10−10.0