As for the "rock people," the Noah narrative mentions "nephilim," typically conceived as giants. They weren't good guys, though. They were the bastard children of spirits who raped women.
I heard a sermon on the nephilim the other day. The offspring of the "sons of God" or angels that fell with Satan, who lusted after the "daughters of men" according to Genesis 6:4
"The Nephilim were on the earth in those days—and also afterward—when the sons of God went to the daughters of humans and had children by them. They were the heroes of old, men of renown." (In other words super humans or demigods admired by humans
) And it was this super human race of beings that many Bible scholars believe is what took the peoples eyes off God and onto their new heroes these demigods. Sounds a bit like Greek mythology, don't it? And the human race went down hill from there.
5 The Lord saw how great the wickedness of the human race had become on the earth, and that every inclination of the thoughts of the human heart was only evil all the time. 6 The Lord regretted that he had made human beings on the earth, and his heart was deeply troubled. 7 So the Lord said, “I will wipe from the face of the earth the human race I have created—and with them the animals, the birds and the creatures that move along the ground—for I regret that I have made them.” 8 But Noah found favor in the eyes of the Lord.