This 1 inch long scat is from a snake. There is a white tip that looks to be painted on (but wasn't). When you try and break it up with a stick, the white does not break away easily. If it did, this would be lizard scat. There are many species of snake in this area and I do not know which type it is.
Transect 23 near wildlife tunnel in mixed chaparral. Seen during wildlife survey of the area.