You can not trust dates on tombstones since they were often put up years after the death by relatives who are not sure of the dates so just estimate them.
Angels Camp and Altaville are basically the same town. At one time they were separated but have merged with locals still calling the one area Altaville. The cemeteries are all in Altaville, with a Protestant, Catholic and a Serbian cemetery all next to one another.
I will look for a newspaper obituary when I am at the county archives next week and will let you know what I come up with.