Dinosaur remains diagnostic to the genus level are among the fossils that have been recovered from the formation.

It contains the most extensive Campanian-aged dinosaur fauna from New Jersey and Delaware.

[1][2] The famous Ellisdale Fossil Site, a konzentrat-lagerstätten which contains one of the most diverse Cretaceous vertebrate assemblages (likely rapidly buried in a massive flood event) known from eastern North America/former Appalachia, is an exposure of this formation.

[3] The Marshalltown Formation stretches across southern New Jersey to northern Delaware, and is largely composed of marine sediments deposited off the eastern shore of Appalachia, although the Ellisdale site represents a fluvio-deltaic or tidal-estuarine environment reminiscent of the modern Albemarle Sound, and thus has more of a terrestrial influence.

This article about a specific stratigraphic formation in the United States is a stub.