 The toponym Delmarva is a clipped compound of Delaware, Maryland, and Virginia ( "VA"), which in turn was modeled after Delmar, a border town named after two of those states.While Delmar was founded and named in 1859, the earliest uses of the name Delmarva occurred several decades later (for example on February 10, 1877 in the "Middletown Transcript" newspaper in Middletown, Delaware) and appear to have been commercial; for example, the "Delmarva Heat, Light, and Refrigerating Corp." of Chincoteague, Virginia, was in existence by 1913—but general use of the term did not occur until the 1920s.At the northern point of the peninsula there is a geographic fall line that separates the crystalline rocks of the Piedmont from the unconsolidated sediments of the Coastal Plain.