Driving Behavioral Change for Information Management through Data-Driven Gree...
Geological time scale
1. I. What is the Geologic Time
Scale?
a. Based on their interpretations of the
rock record, geologists have divided
Earth’s 4.56-billion-year history into units
that represent specific amounts of
time. Taken together, these time spans
make up the geologic time scale.
2.
3. I. What is The Geologic Time
Scale
b. The geologic time scale is divided into
sections based on fossil evidence.
c. Organisms have become more
complex over time.
d. Geologic time divisions represent
changes in the fossil evidence.
7. II.Measuring Geologic Time
A. Eras (largest divisions)
1. Precambrian – earliest,
4 billion years
2. Paleozoic – 345 million years
3. Mesozoic – 160 million years
4. Cenozoic – current, so far
65 million years
8. B. Eras are divided into
periods (except for
Precambrian)
C. Cenozoic periods are divided
into epochs
9.
10. III. Geologic Eras
A. Precambrian
1. Earth forms including
seas & mountains
2. Few fossils of jellyfish,
worms, bacteria, algae,
& fungi
11. Extra
How do you date rocks that
don’t have organisms in it?
URANIUM’s-Lead’s Half-Life
Any rock/fossil that is over
50,000 years!
12. B. Paleozoic – 6 periods
1. Invertebrates most common
a. Trilobites
b. Brachiopods
2. Vertebrates – fish and
amphibians
3. Plants – ferns and trees in
swampy areas
