For the Green River sites, the large number of temperate and sub-tropical taxa suggest that the region received ample rainfall, perhaps seasonally, and that temperatures were relatively mild. Although most of the plant fossils are leaves, there are also fruits and seeds known. Equisetum winchesteri - a horsetail.
Horsetails are among the most recognizeable plant fossils.
They are known from as early as the Carboniferous and there are still many species alive today. Stems of these plants usually are rough to the touch because of tiny silica crystals in the tissues. Lygodium kaulfussi - a climbing fern. Species of Lygodium exist today in temperate Asia and eastern North America. They are often vine-like.