Geologists have collected some 35 species of ancient plant life from the Middle Miocene Aldrich Station Formation; a geologic rock unit dated roughly 13 to 12.5 million years old. Among the many fossil plant remains found at Aldrich Hill, are complete carbonized leaves from an Evergreen live Oak, in addition to many conifer winged seeds and even giant sequoia foliage. All of the fossil p

If a microscope if is available, you can find remains of an especially prolific fossil type, the diatom. This microscopic single celled plant lived in the rocks of the middle to late Miocene age, roughly 17 to 5 million yeas ago. The scientific extraction of diatoms for paleobotanical study is a dangerous operation, involving powerful acids. Most diatoms form Aldrich Hill resembles minute boxcars and discs.

lants are exposed on the north side of the rock unit. Out stations of this plant bearing strata can be examined along the main wash, which trends generally east to west across the open side. Other exposures can be also found in the minor erosion gullies that jut out through the north side.

Based on the known climate requirements of present day plant life fauna, the Aldrich Hill plant life had quite a different environmen

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