A relative age dating activity answer key

The study of fossils and the exploration of what they tell scientists about past climates and environments on Earth can be an interesting study for students of all ages.Teaching about Earth's history is a challenge for all teachers.Sequencing the rock layers will show students how paleontologists use fossils to give relative dates to rock strata.

This ourcrop is a natural geologic cross section of rock layers, analogous to the cake 1.

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PALEONTOLOGY, AND in particular the study of dinosaurs, is an exciting topic to people of all ages.

Although most attention in today's world focuses on dinosaurs and why they became extinct, the world of paleontology includes many other interesting organisms which tell us about Earth's past history.

For example, most limestones represent marine environments, whereas, sandstones with ripple marks might indicate a shoreline habitat or a riverbed.

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.In this activity, students begin a sequencing activity with familiar items — letters written on cards.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.Label each arrow (contact) to show its relative age from 1 (the time when the first contact was creatod; the oldest contact) to "n" (the number corresponding to the last time a contact was created; the youngest contact). The picture below is an outcrop about 5 meters thick near Sedona, Arizona. The brown layer in which grass is rooted is modern soil. Using a pen, draw a line on the picture that marks the exact position of: a. Notice that clasts (broken pieces) of the lava Hlow are included in the brown soil. The blocky brown-gray rock with wide fractures (cracks) is an ancient lava low (basalt, a volcanic rock). the conract between the red ancient soil and the lava flow. the exact contact between the top of the lava flow and the base of the darker brown modern soil in which grass is growing. Notice the fractures (cracks) that cut across the lava flow layer. Using a pen, draw lines on the layer cake to mark all of the contacts between layers.