Ironwood Plant Fossil
Magnoliophyta, Class Magnoliopsida, Order Fabales, Family Mimosoideae
Time: Miocene, 16 million years ago
frond is 57 mm in length by 68 mm in width on a 16 x 9 cm plate
Central Nevada has a host of Miocene fossil leaf sites. The leaves
from this one are preserved in paper shales and exhibit the best
plant preservation I have ever encountered. Some of these shales
are incredibly fragile, nearly as thin as a sheet of paper.
state once had a much wetter and more temperate climate back in
the Miocene. There were many more lakes in what is now the driest
state in the USA. The Sierra uplift dramatically changed the climate
and rainfall in the state.