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Chapter 5 Geologic Time Crossword

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Across
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The most recent 541 million years of geologic time, including the present, represented by rocks that contain evident and abundant fossils
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Atoms of the same element that have different numbers of neutrons
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A type of conformity in which layered sedimentary rocks lie on an erosion surface cut into ingeous or metamorphic rock
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A thin, widespread, easily recognized sedimentary layer that can be used for correlation because it was deposited rapidly and simultaneously over a wide area
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A term describing sedimentary layers that were deposited continuously, without detectable interruption
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An unconformity in which younger sediments or sedimentary rocks rest on the eroded surface of tilted or folded older rocks
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The longest unit of geologic time that is divided into eras
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The process of establishing the age relationship of rocks or geologic features from different locations on Earth, this can be done by comparing sedimentary characteristics of the layers or the types of fossils found in them
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The age of a geologic event based on the number of years ago it occurred
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An approach to determining the timing of geologic events based on the order in which they occurred, rather than on the absolute number of years ago in which they occurred
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A geologic time unit that is divided into periods
Down
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Referring to the absence of oxygen
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Sheet-like body of plutonic igneous rock that forms when magma flows into a rock fracture
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A type of unconformity in which the sedimentary layers above and below the unconformity are parallel
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A chronological arrangement of geologic time subdivided into eons, eras, periods, epochs, and ages
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The process of measuring the absolute age of rocks, minerals, and fossils by measuring the concentrations of radioactive isotopes and their decay products
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A fossil that dates the layers where it is found because it came from an organism that is abundantly preserved in rocks, was widespread geographically, and existed as a species or genus for only a relatively short time.
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A term referring to all of geologic time before the Paleozoic era, encompassing approximately the first 4 billion years, or roughly 90%, of Earth's history; also refers to all rocks formed during that time
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A geologic time unit that is divided into ages
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A boundary between layers of sediment or sedimentary rocks that represents an interruption that involves partial erosion of the older layer.
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The rocks that currently exist on Earth and contain the record of its history.
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The time it takes for half of the atoms of a radioactive isotope in a sample to decay
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A geologice time unit that is divided into epochs
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The shortest unit of geological time