Based on research by Edward Hitchcock two or three basins can be identified based on a larger number of interconnected terraces in the Passumpsic River Valley.
He published papers on fossilized tracks in the Connecticut Valley, including Eubrontes and Otozoum, that were later associated with dinosaurs, though he believed, with a certain prescience, that they were made by gigantic ancient birds.
The name was originally used by Edward Hitchcock as a higher group name rather than a specific ichnogenera, and thus the name does not have priority over specific ichnogenera names even if they were first identified as Ornithichnites.
In the 1840s, Hitchcock suspected laminated sediment in North America could be seasonal, and in 1884 Warren Upham postulated that light-dark laminated couplets represented a single year's deposition.
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