My paleobotany page, "Fossil Plants At Aldrich Hill, Nevada," is now
back on online, after several months in hiatus, over at
http://members.aol.com/Waucoba5/ah/aldrichhill.html . It's a virtual
field trip to the classic fossil locality in western Nevada, where some
35 species of aancient plants, represented by leaves, seeds and twigs
preserved on the bedding planes of diatomaceous (bearing a high
proportion of diatoms, microscopic single-celled plants) siltstones and
mudstones, can be found in the 12 to 13-million-year-old Middle Miocene
Aldrich Station Formation. A sampling of paleobotanical remains that
can recovered from this locality includes the leaves of evergreen live
oaks, winged seeds from a variety of Spruce, plus twigs from the Giant
Sequoia (Sierra Redwood/Big Tree).