The first card in the sequence has "Card 1, Set A" in the lower left-hand corner and represents the bottom of the sequence. Specific rock formations are indicative of a particular type of environment what up a relative dating activity answers when the rock was being formed. Find a rock layer that has at least one of the fossils you found in the oldest rock layer. Cartilage fish; many living species.
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Teaching about Earth's history is a challenge for all teachers. Time factors of millions and billions of years is difficult even for adults to comprehend. However, "relative" dating or time can be an easy concept for students to learn. 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.