In geology, bedrock is solid rock that lies under loose material (regolith) within the crust of Earth or another terrestrial planet.
And he shall not look to the altars, the work of his hands, neither shall respect that which his fingers have made, either the groves, or the images. Book of Isaiah 17:8 KJV
The various kinds of broken and weathered rock material, such as soil and subsoil, that may overlie the bedrock are known as regolith.