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.
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