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UT Arlington GEOL 1425 - Overview of Geologic time
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GEOL 1425 1st Edition Lecture 11Outline of Last LectureI. FaultsII. DomesOutline of Current Lecture I. Geologic timeII. Dating the earthCurrent Lecture• Absolute age: number of years elapsed from an event to now.• Relative ages: only if one can tell if one event is older than another• Stratigraphy: study of layers(strata) in rocks.• Unconformity: boundary at which two existing formations meet.• The geologic time scale divides Earths early history into intervals marked by distinct sets of fossils, and it places the boundaries of those intervals at times when those fossils change abruptly. Basic division of this into eras• Each area is divided into periods: usually named for the locality in which the formationwas best described.• Isotopic dating: use of naturally occurring radioactive elements to determine the age of rocks.• Earth is 4.56 billion years old. • Many major boundaries in the geologic scale represent mass extinctions• The isotopic age of a rock corresponds to the times since the isotopic clock was reset, when the isotopic minerals were locked into the rock• This locking usually occurs when a mineral crystalizes from as magma or metamorphism• Initial number of daughter atoms must be taken into account when calculating isotopicages.• Paleo- magnetic stratigraphy has recently become one of the main ways fro measuring sedimentation rates along the continental margins and in the deep sea. These notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a


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UT Arlington GEOL 1425 - Overview of Geologic time

Type: Lecture Note
Pages: 2
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