The Ginkgophyta probably originated about the same time as the Cycads
during the late Paleozoic, with fossils found in North America until
the Miocene. The fan-shaped leaves of most members are quite distinctive.
This one is atypical, with deeply dissected leaves with 4 lobes
that are further divided, making the derivation of the specific
name obvious. Gingko biloba is the only extant member. The flora
was dominated by conifers farther away from the lake, and elm, birch,
beech, and alder near to the lakeshore.
plaque displays a fine example of a tree from the lacustrine deposits
of the McAbee Flora of the Eocene of British Columbia, Canada with
fine preservational details. The region was dominated by a shallow
lake. Plant matter which fell into the water was covered with a
fine layer of silt which built up over the years as a result of
deposition of diatoms which bloomed in the lake each spring and
died in the summer. This is a fine example of the preservation for
which this biota is known.
see: Living Fossils
Plant Fossils Ginkgo