The rock record shows a change to a modern style of mountain building and plate tectonics. We see the first evidence of life on Earth. The Cambrian Explosion. The Burgess Shale. The Ediacaran fauna.
Precambrian rock can be complexly deformed.
Precambian rock is commonly metamorphozed. It is a captured planetismal. It was once a planet, and got knocked out of orbit and was captured by Earth's gravitational field. It is a remnant of the planet that once existed between Mars and Jupiter. It was formed by the collision of the Earth with a Mars-sized planetismal.