Realative dating

After the uplift of the land, the forces of erosion attacked the highlands and the eroded rock debris was transported and redeposited in the lowlands.

During the same interval of time in another part of the world, the land surface subsided and was covered by the seas.

This activity has students working as archaeologists.

They will excavate a hypothetical archaeological site from their school yard, make observations, and write an interpretation of the history of the area based on the evidence they will excavate.

From the results of studies on the origins of the various kinds of rocks (petrology), coupled with studies of rock layering (stratigraphy) and the fossils they contain (paleontology), geologists have associated layers of rocks with sequence of events thought to have occurred over hundreds of millions of years.

For example, it is believed that during a particular episode the land surface was raised in one part of the world to form high plateaus and mountain ranges.

With the sinking of the land surface, sediments were deposited on the ocean floor.

Each year a tree adds a layer of wood to its trunk and branches thus creating the annual rings we see when viewing a cross section.Relative dating is a dating method that used to determine determine the relative ages of geologic strata, artifacts, historical events, etc.This technique does not give specific ages to items.To facilitate the activity, the teacher will provide some introduction to absolute dating principles through the Half Life of M&M Worksheet.Then in Phase 2 of the project, the teacher will provide the students with plastic bins each representing a different stratum of the archaeological site.

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Concept 3, PO 1: Interpret data that show a variety of possible relationships Concept 4, PO 2: Produce graphs that communicate data Concept 4, PO 3: Communicate results clearly and logically Concept 4, PO 4: Support conclusions with logical scientific arguments Strand 6: Earth and Space Science Concept 3, PO 4: Interpret a geologic time scale.

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