Please help.. What kind of fungus is this?

Hi there. We were walking some trails near our home today with our dogs and stumbled upon what looks like someones large size mushroom growing operation. The only private property was a mile away with 4x4 trails that go to this location. We are wondering what kind of mushrooms they are planting out in the forest.

Here's a few pictures:

They look like oyster mushrooms

I agree with Burra. They look like blue oyster mushrooms to me.

Thank you guys. They sure do! I searched all over the internet last night lol and that's what we figured too.  

The weird thing is we don't see the bags hanging from trees anywhere around where the crates of spawn bags are, or piles of the sawdust spawn on the grounds anywhere. Yet there are tons of empty bags they are piling up so wouldn't that mean they must be emptying the contents in some sort of organized fashion where the mushrooms can grow?  After reading some info about it I was under the impression people just hang those bags after putting some holes in them.
Did we perhaps not see where they are putting all of the contents of the bags?

Definitely oysters,  very cool discovery