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Based on principles laid out by William Smith almost a hundred years before the publication of Charles Darwin 's theory of evolutionthe principles of succession were developed independently of evolutionary thought. Multibranched relative of starfish; lives attached to the ocean bottom; some living species "sea lilies" NAME: Using the principle of faunal succession, if an unidentified fossil is found in the same rock layer as an index fossil, the two species must have existed during the same period of time Figure 4. Armstrong, F. Main article: New York: These changes typically occur so slowly that they are barely detectable over the span of a human life, yet even at this instant, the Earth's surface is moving and changing.

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Fossil species that are used to distinguish one layer from another are called index fossils. The Earth's magnetic field has reversed many times during its history. In addition, because they are trapped at high pressures many melt inclusions also provide important information about the contents of volatile elements such as H 2 O, CO 2S and Cl that drive explosive volcanic eruptions. Scientists also use direct evidence from observations of the rock layers themselves to help determine the relative age of rock layers. Because of this, magnetic minerals in rocks are excellent recorders of the orientation, or polarityof the Earth's magnetic field.

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Interval of time when the earth's magnetic field is oriented so that the magnetic north pole is approximately in the same position as the geographic north pole neutrons:

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Dating Rocks and Fossils Using Geologic Methods

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. Negatively charged subatomic particles with very little mass; found outside the atomic nucleus electron spin resonance: Multibranched relative of starfish; lives attached to the ocean bottom; some living species "sea lilies" NAME: These major concepts are part of the Denver Earth Science Project's "Paleontology and Dinosaurs" module written for students in grades As a result, rocks that are otherwise similar, but are now separated by a valley or other erosional feature, can be assumed to be originally continuous.

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8.2 Relative Dating Methods

Geologists can measure the paleomagnetism of rocks at a site to reveal its record of ancient magnetic reversals. Reversed polarity is when the magnetic "north" is near the geographic south pole. Chemical substances that cannot be split into a simpler substances fault: Oxford University Press Molecular clock. Just as the magnetic needle in a compass will point toward magnetic north, small magnetic minerals that occur naturally in rocks point toward magnetic north, approximately parallel to the Earth's magnetic field.

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