|Phyotoliths extracted from soil samples from the
site (b, e, and f) and from modern comparative collections (a, c, and d). Plants produce distinct
types of these tiny cells. The Hinojosa phytoliths included tall grasses, short grasses, and, most
intriguingly, several genera of the Pooideae subfamily of grasses. Pooideae grasses are cool season
grasses that thrive in relatively moist conditions. Their presence suggests that the prevailing
climate was somewhat wetter and possibly cooler than today. Black 1986:Fig 16.
See detailed caption.