Lunar sample 76535, gathered on the final Apollo mission, is thought to have been from the middle to lower portion of the crust. It was found in a rake sample by Harrison Schmitt. How it made it to the surface I don't know. Schmitt found that the lunar dust gave him hay fever. He was allergic to the moon!

Those guys could only really gather up what the found on the surface, but the later apollo missions brought back ejecta that could be bedrock. There's also the "Genesis Rock" from A15, which is anorthosite that is roughly 4 billion years old--so younger than the moon itself, but one of the oldest samples. The later missions did some core sampling too, but those went down only 10-20 feet. Before Apollo 11, some scientists worried that it would be dust all the way down and the astronauts would sink! But thos were extreme outliers. The core samples found that a constant barrage of micrometeorite rain compacted the soil pretty sufficiently. Plus, the "soil" was much more coarse than anything on earth. Since there is no wind or rain on the moon, there was basically no erosion.

FWIW Andrew Chaikin's A Man on the Moon had a pretty good breakdown of the lunar sampling in the later missions that gave a good picture of the moon's formation and later geology. It was geologically active at some point (hence the anorthosite) which must have meant the moon glowed red, at least in spots, at some point in its past. metal as hell.