First Sentence:
A geologic time scale (geochronologic scale) is composed of standard stratigraphic divisions based on rock sequences and calibrated in years.
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Key Phrases - Statistically Improbable Phrases (SIPs):
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chron interpolation, chronostratic scale, chronostratic divisions, chronostratic error, scanning age, date date error, magnetic anomaly scale, glauconite dates, dated magnetic anomalies, magnetic anomaly sequence, magnetized intervals, polarity bias superchrons, chronometric scale, time scale calibration, geochronologic scales, isotopic database, chronometric calibration, polarity reversal scale, reversal time scale, database plotted, isotopic dates, chron age, polarity intervals, boundary stratotype, definitive scale
Key Phrases - Capitalized Phrases (CAPs):
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North America, Van Couvering, National Grid, Sum Tie-point C-gram, Cretaceous Period, Geological Society of London, British Isles, New Zealand, United States, Carboniferous Period, Cenozoic Era, Lower Cambrian, Precambrian Subcommission, Ellesmere Island, Old Red Sandstone, Paris Basin, Scythian Epoch, Sinian Era, Solar System, South Wales, British Columbia, Early Permian, John Day, Late Jurassic, Mid Ordovician
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