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The fossil record is one of the most important data sets that establishes
evolution as a scientific fact. Although incomplete, our knowledge
of past life is far better than it was in 1859 when Darwin remarked
in the Origin of Species, “[t]hat our paleontological
collections are very imperfect…”. Fossils collected
since Darwin’s time have confirmed many of his predictions
and have helped to clarify the historical path that life has taken
over the past 3.5 billion years. For this year’s Darwin Day,
we will take up the topic of the fossil record and focus on the
earliest animal fossils known to scientists, those of the Ediacaran
and Cambrian periods. We will examine how fossils are formed, how
they are studied by paleontologists, and learn what they can tell
us about the earliest history of animal life.
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