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What is the Fossil Record?
What are some drawbacks to the fossil record?
This Day in History
• The first US Fraternity formed (1776)
• The Gold Rush started (1848)
• First electric car built (1893)
• Albert Einstein comes to America (1932)
• 21st Amendment Ratified
Fossil Record
Biogeography
• Study of past and present geographical
distribution of species
– Continental Drift
– Geographic Isolation
Geographic Isolation
• members of the same
species can no longer
mate due to geography,
and the result is two
isolated gene pools that
evolve over time to
become two separate
species.
Continental Drift
• implies that as the super continent Pangea
split to form separate continents, members of
the same species were separated by water
and over time became separate species.
Questions
• Did continental drift lead to geographic
isolation?
• What are some other land features that could
lead to geographic isolation?