The Grund assemblage comprises 45 vertebrate species from marine and terrestrial ecosystems. A whale, sharks, rays, bony fishes, and sea-birds hint at marine conditions, whereas a salamander, a pheasant bird, turtles, snakes and land-mammals indicate various terrestrial paleoenvironments. Biostratigraphically the upper part of MN5 (mammals) and the upper part of the Lower Lagenidae Zone (foraminifers) are indicated. The assemblage of Grund therefore serves as a reference point for the continental/marine correlation in the Central Paratethys.