Vincent Massey Junior High School

Unit 4: Planet Earth

Topic 1

Minerals

Topic 2

Rocks

Topic 3

Erosion and landforms

Topic 6

Volcanoes

Topic 5

Earthquakes

Topic 7

Mountains

Topic 4

Moving Crust

Topic 8

Fossils

Why study fossils?

Topic 9

Geologic Time

Topic 10

Fossil Fuels and Geology of Calgary

Topic 8: Fossils

 

Trilobite

Dates to Remember

April 30: Video - Fossils by Bill Nye. Topic 4 review due. Look at some fossils.

May 1: Make A Lasting Impression Activity Page 421. Bring in small objects and margarine pots.

May 2: Activity - paleogeography hand out. Topic 7 review page 422 .

 

New words:

Fossil: the remains or trace of a once living organism.

Petrified: replacement of calcium carbonate (soluble in water) with silica (quartz) making a bone or plant into a hard rock-like substance.

Carbonaceous film: the outline of an organism outlined by a thin covering of carbon residue.

Trace fossils: evidence of animal activity,e.g. footprints, worm burrows, snail trails.

Unknown tracks - any ideas?

Unknown animal footprints

Mould: the cavity left by the dissolving of the original organism.

Cast: the shape of the organism that is made by the filling in of a mold with other sediments.

 

 

Resources: Text Book pages 418-422

 

 

 

Coprolite (dinosaur poo!)

Stromatolite - ancient bacterial build up. layers were produced as calcium carbonate precipitated over the growing mat of bacterial filaments, 3.8 to 2.5 billion years ago.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Five Principal Applications of Fossils

Telling time...Biostratigraphy

Paleontologists use fossils for relative dating of rocks throughout the world. Organisms that are abundant, evolve quickly, have a wide distribution and are relatively tolerant of a wide range of environments make the best time indicators.

Understanding ancient environments...Paleoecology

The appearance and disappearance of different fossils through time tells a story of changing environmental conditions. One of the main objectives for study of sedimentary rocks is the reconstruction of the environment in which the sediments that form the rocks were deposited.

Understanding the History of Life on Earth

Without the study of fossils, we would know nothing about the history of life on earth.

Understanding continental movements...Paleobiogeography

Unusual patterns in the distribution of fossils were one of the reasons taht scientists began to suspect that the continents had not always been in the same position.

Understaning the relationship of life to planet Earth...Paleobiogeochemistry

Knowledge of the history of life provides important imformation for the understanding of processes that have taken place and are still taking place on the Earth's surface. The existance of life has affected the chemistry of the oceans and the atmosphere over the past 3 500 million years.

 

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© Diane Nowlan, April 2002

jdnowlan@cbe.ab.ca

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 


 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

All contents copyright © 2002, Diane Nowlan
Revised:January, 2002
Author: Diane Nowlan
jdnowlan@cbe.ab.ca