Some of them look like Vacor. The blue and yellow ones left of center look Vacor ... or Asian. Modern and foreign anyway.
The ones to the right of that look mostly vintage. Not exciting though.
I'm not seeing a reason for a four hour trip.
I have no clue. Marble King made some bright UV marbles which were nearly clearies in modern times, but they didn't look like that.
All I can do is bump the thread.
Here is a video of an eaglet flying out of its nest tree for the first time. Happened last night. Now it is a fledgling.
It's part of the Decorah family of eagles. https://www.raptorresource.org/birdcams/decorah-eagles/
As to value, I'd think as a general rule knowing it's dug could lower monetary value. But I think the lines are probably blurred. If a marble is only known from the digs, and if not that many of them are known, then different rules would apply.
I don't know how to answer that. Probably a lot of dug ones you wouldn't be able to tell. But those colors are like a "spotted leopard" ... but without the spots. The spotted leopard is a fairly well known dug marble. http://marbleconnection.com/topic/9425-dug-leopard/
Here's an earlier dug marble example Lizzy posted with somewhat similar coloring, which was ID-ed as a spotted leopard.