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The Newark Supergroup includes the lithologically and structurally related continental clastic rocks and interbedded basalt flows of Triassic and Jurassic age that are exposed in discrete elongate basins parallel to the Appalachian orogen in the Piedmont of eastern North America. A brief review of the origin and characteristics of the early Mesozoic basins and summaries of the history, location, and structure of each of the basins provide background for understanding the development of the stratigraphic nomenclature of the basins. The lexicon consists of summaries of papers containing definitions and revisions of the more than 100 formal and informal names used to identify Newark Supergroup rocks. The papers were selected from the literature of the last 135 years. For each unit, the occurrence, lithology, areal distribution, age, and relation to other units are described. Problems in the nomenclature are noted.

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