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The Adobe Flash Player is required in order to view this content. You can get it here: K-T boundaryOne entry found. Main Entry: K–T boundary Function: noun Etymology: K (alternative for C as abbreviation for Cretaceous) + Tertiary Date: 1983 : the transition between the Cretaceous and Tertiary periods of geologic time characterized by a mass extinction of many forms of life including the dinosaurs; also : a geologic stratum marking this boundary 
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