Session #3: Lines of Evidence for Past Change
This session begins with a look at the nature of science,
a review of energy transfer, transportation and deposition, and
then explores stratigraphy, fossil evidence of past life, and evolution.
Jump to: Nature of Science
| Reviewing Energy Transfer, Transportation
and Deposition | Stratigraphy |Stories
from the Fossil Record | The Importance
of Variation | Looking at the Big Ideas
| Additional Resources
Stressing the Nature of Science
Reviewing Energy Transfer, Transportation
Erosion is the process through which surfaces of rocks and soil
are loosened and then transported elsewhere. But where does all
of that sediment go? This series of slides illustrates the nature
of San Francisco Bay as a depositional basin.
The San Fransisco Bay as an Energy
Stratigraphy - Timing Events in the
Geologists determine the sequence of geological events by
using certain basic principles and assumptions. These slides
discuss horizontality and superposition, cross-cutting relationships,
inclusions, unconformities, and correlation in order to determine
the sequence of events.
Timing Events in the Past
Stories from the Fossil Record
The fossil record provides concrete evidence of the history of
life and the processes through which it has evolved. The clues are
numerous and can be interpreted by comparing an entire assemblage
of fossils, a single fossil, or even the traces left by past life.
The Importance of Variation
Variation exists among individuals within species. Variation leads
to different "survival" rates, which leads to changes in frequencies
in a population, which is evolution.
Looking at the Big Ideas
Geologic Time: This web-based module introduces students
to geologic time, the evidence for events in Earth's history, relative
and absolute dating techniques, and the significance of the geologic
Into the Fossil Record:
This web-based module helps students gain a basic understanding
of what a fossil is and how a fossil forms.
the Fossil Record: This web-based module provides students
with a basic understanding of how fossils can be used to interpret
the past. There are four different pathways to explore: biodiversity,
geologic time, paleoecology and past lives.
Big is a Billion? Most people have a difficult time comprehending
the enormity of the numbers involved in discussions of geologic
time. These exercises help students to better understand what "a
billion" really means.
Updated January 5, 2003
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