It's important to note that the specific fossil you're thinking of might be a bit more specific than just a *Hesperornis* skull. There are many *Hesperornis* fossils found in that area, and without further context, it's difficult to pinpoint exactly which one you're referencing.
To narrow down the search, consider these points:
* Specific species: Was it *Hesperornis regalis*, *Hesperornis crassipes*, or another species?
* Unique features: Did the skull have any unusual characteristics?
* Context: Was the discovery part of a larger dig, or a lone find?
Knowing more about the fossil you're interested in will help to give you a more precise answer.