Fossils in the United
States
The United States is rich
in fossils. Most of them are found in s y rocks, which originate
from sediment pressed down from the weight of the upper layers, and a few of
them are found in ice. There are fossils of leaves, and s s. Dents left in t ls by moving c s can be fossils too. The
oldest fossils are m c
traces b a left over
4 million years ago. The oldest animal fossils are the remains of
invertebrates, which are 700 million years old. The oldest v e are 500-million-year-old fossil
fish. It is e ed
that only a fraction of a vast number of all the life that lived on the earth remains
as fossils. Thomas Jefferson was one of the first American p s. He wrote one of the
oldest scientific research papers on a fossil of a v e. It was about 3
large fossil c s
found in western Virginia. He kept a fossil collection in the White House and
sent a fossil collecting e n to Kentucky as a sitting president.
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