Welcome to the Board, #1.
I'm sorry to hear about your father and understand your need to know what the rock "treasures" are that he collected.
I hope we can be of some help.
But I have to tell you, good pictures of the rock cobble, but I don't think you could find a more complicated rock to begin with.
Look at all the different things going on in that rock! Probably 10-15 different minerals.
It looks like an igneous breccia. You can look that up to start with but then you just start trying to identify each
individual piece in the mix. What are the white spots? the green spots? and so on.
It would be hard to tell when and how it was formed without know "where" it came from.
If you know where it came fom then it is much easier to find out what it is by looking up the USGS information on the area.
And locals may have a real easy name for it already, " Oh yeah, that's that Black Mixed-Up Granite stuff."
And maybe someone will recognize the material and chime in.
Same goes for your other pics of the large rocks.
Very cool looking rocks and it will be very interesting to figure out what they are made of and how they were formed.
To do that we need to know where they are. Northern California?
Any information about the source of these rocks is pretty critical.

Thanks for the pics,
Joe

Yes that helps a lot, #1.
Sounds like your Dad, like the typical rockhound, got around to all the hot rock spots out there. Good for him!
And, just so you understand a little about rockhounds, they also typically pick up and bring home for closer inspection
rocks that are just plain weird and defy all explanation.

Anyway, I'm going to guess the cobble rock is a volcanic breccia from the Napa Valley area.
And I've seen something similar and will try and post some pics of a rock where the green clasts are jade.
Here's links to a couple pages for you to read while I look at eastern southern California about 2000 feet up.

http://mathsci.solano.edu/users/mfeighne/vol1.page3.htm

https://en.wikipedia.org/wiki/Sonoma_Volcanics