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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. Fossils indicate that many organisms that lived long ago are extinct.

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Teachers should note that the stratigraphic information provided for the second part of the activity is purely hypothetical; however, this is still a valuable exercise since its successful completion will allow teachers to initiate a discussion on the Law of Superposition and index pop dating website without overwhelming students with too many details.

For example, students should discuss which fossils are making their first appearance in a particular segment and which fossils have disappeared.

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The activity helps students to understand that long spans of geologic time can be broken down into more manageable segments by using relative ages. Primitive armored fish; extinct NAME: Carnivore; air-breathing aquatic animal; extinct. Scientific measurements such as radiometric dating use the natural radioactivity of certain elements found in rocks to help determine their age.


Comments about Including the Science and Engineering Practice In this activity, students are tasked with constructing a timeline using fossils. Explore this link for additional information on the topics covered in this lesson: By matching partial sequences, the truly oldest layers with fossils can be worked out.

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The first card in the sequence has "Card 1, Set A" in the lower left-hand corner and represents the bottom of the sequence. Comments about Including the Disciplinary Core Idea In this activity, students construct their fossil timeline simply by identifying overlapping fossils in the pieces; it is only after students construct their records that teachers are instructed to provide Figure 2-B which illustrates a hypothetical section of rocks with fossils.

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The fossils represented by the letters on this card are "younger" than the "T" or "C" fossils on the "TC" card which represents fossils in the oldest rock layer. It should be noted that teachers may have to edit the introductory materials provided to labs activity relative dating answers, since the readings may be too difficult for younger middle school students.

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To bring this activity more in line with the Disciplinary Core Idea, teachers may wish to redesign the materials provided the students by cutting up FIgure 2-B and instructing students to organize these pieces instead. This resource is explicitly designed to build towards this science and engineering practice. Shelled, amoeba-like organism NAME: Again, this exercise is only hypothetical but the experience provided to students can be transferred to actual rock data. If certain fossils are typically found only in a particular rock unit and are found in many places worldwide, they may be useful as index or guide fossils in determining the age of undated strata.