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Didelphis virginiana
Jaw bone (about 4 inches) and piece of a brain case. Found with fish jaw and vertebrae in a cache in a ravine.
Forested area near a small pond and fields in rural area.
The last image has jaw bones from a raccoon above and a mountain cottontail below, both found in Utah, for reference.
Ok, yes, looking now, I think you are correct about the opossum ID. The second picture does show the angular process is inflected as it should be for a marsupial, but it is worn or broken off...cool find!
I uploaded more photos, but comparing it to other jaws I'm thinking Virginia opossum, maybe a juvenile.
Looks like a rabbit jaw? Possible to get a look at the outside (labial) of the jaw?