Download Chapter 23 Earth Science

Chapter 23
Earth Science
Alex Newell
4/4/10
The Paleozoic Era
•
•
•
•
Continental setting
Changes in sea level
Life moves to land
The Late Paleozoic
Paleogeography
• What
geologists refer
to the ancient
geographic
setting of an
area
Passive margin
• The edge of a
continent is
called a margin;
when there is no
tectonic activity,
along as a margin
Transgression
• Occurs when sea
level rises and the
shoreline moves
further inland
Regression
• Occurs when sea
level falls and
causes the
shoreline to move
seaward
Mass extinction
• When an unusually large number of organisms
become extinct over a relatively short period
of geologic time
Amniote egg
• Reptiles that
evolved from
the early
amphibians
developed a
new type of
egg