Hi Bill,
I know both Jorge and Austin, and I agree with their comments. It seems you’ve found some fossil whale bone, but unfortunately it also seems to be pretty heavily weathered. I cannot confirm which bone(s) you have or the species.
Cetaceans are known from the Towsley Formation. A skull was described in a paper by Barnes in 1977, “Outline of Eastern North Pacific Fossil Cetacean Assemblages”
Best,
Victor