(1) Many of the plants are endangered species, including the dove tree and the ginkgo .

(2) The scientists analysed fossils of gingkoes and ferns that were growing at the time to estimate the amount of carbon dioxide that was in the air.

(3) Plant life consisted mainly of ferns and seed-ferns, with new plants like conifers and ginkgos coming into prominence.

(4) On land, the vegetation generally consisted of conifers, cycads, ginkgos , ferns and horsetails.

(5) Investigators have suggested that these fossils represent new growth from cycads, deciduous trees, ginkgos and, most commonly, conifer trees.