That sounds very familiar. I love in the big plain down the middle of California our "black dirt" goes down 6-7ft then there is gravel weirdness. You have to check the dirt before deep ripping to make sure you don't get rocks and the dirt is still good. We get seasonal workers from Mexico and we had to dig holes to prove that was true. They just have the same soil all the way down.
That sounds very familiar. I love in the big plain down the middle of California our "black dirt" goes down 6-7ft then there is gravel weirdness. You have to check the dirt before deep ripping to make sure you don't get rocks and the dirt is still good. We get seasonal workers from Mexico and we had to dig holes to prove that was true. They just have the same soil all the way down.