Relative dating of rocks activities
You get to the same file if you click on the blue link that says fossil cards.
For example, most limestones represent marine environments, whereas, sandstones with ripple marks might indicate a shoreline habitat or a riverbed.Once they are able to manipulate the cards into the correct sequence, they are asked to do a similar sequencing activity using fossil pictures printed on "rock layer" cards.Sequencing the rock layers will show students how paleontologists use fossils to give relative dates to rock strata.This also means that fossils found in the lowest levels in a sequence of layered rocks represent the oldest record of life there.By matching partial sequences, the truly oldest layers with fossils can be worked out.Information about one of the rock layers will appear – drag the hammer and drop it onto the layer you think is being described. This layer formed on top of earlier rocks after they were tilted and eroded away.
Carry on and place all the hammers on the correct layers.
Return to top The study and comparison of exposed rock layers or strata in various parts of the earth led scientists in the early 19th century to propose that the rock layers could be correlated from place to place.
Locally, physical characteristics of rocks can be compared and correlated.
It looks as though one group of layers was tilted and eroded away before new rocks were formed on top.
Move your mouse over one of the geologist’s hammers. This was the last layer to be formed before the rocks tilted.
To close this lesson I distribute the superposition assessment, and ask students to complete it before leaving the classroom.