Question

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The phrase, "The present is the key to the past," refers to the doctrine of What is the name of a Phanerozoic era that represents the age of mammals? Fossils used for matching rocks of the same age are called Dinosaurs lived during the The remains or traces of prehistoric life are called In an un-deformed sequence of sedimentary rocks, each bed is older than the one above and younger than the one below. The preceding is a statement of the law of 83. 84. 85. 86. 87. 88. era 89 dating occurs when events are placed in their proper sequence or order without knowing their numerical ages. 90. "This igneous dike is 10 million years old." The preceding statement is an example of a (n) 91. The principle of_ 92. 93. 94. age or date. Use the terms that you have been learning in class! states that fossil organisms succeed one another in a definite and determinable order and that a time period can be recognized by its fossil content. A series of intersecting dikes or faults may be placed in proper sequence or order by using the principle of: An unconformity in which tilted or folded strata are overlain by more flat-laying layers is known as a (n) When one rock mass contains fragments of an adjacent rock mass, we know the adjacent rock mass must be older. The fragments used for relative dating in this situation are generally known as What term denotes a buried erosional surface between a mass of granite and the overlying sedimentary rocks? An unconformity in which the strata on either side are essentially parallel is termed a (n) What is the mass number for the radioactive isotope Thorium-230? 95. 96. 97. 98. 99. 100. 01. What is the atomic number of Potassium-40? Give the mass number of the naturally produced, radioactive carbon isotope. What is the atomic number of Uranium-235 (U-235)? Fossil A Ranges in Age from the Pennsylvanian to the Silurian, Fossil B Ranges in age from the Ordovician to the Devonian, and Fossil C ranges in age from the Ordovician to the Silurian. In what period did all three fossils exist at the same time?

Answer 1

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