Wiktionary
n. The oceans of the earth at a time early in its history. The term generally implies either the time before or during the development of multi-cellular life forms (i.e., during the Precambrian), or alternatively before the development of the first land-based life forms (i.e. during the early Paleozoic).
Usage examples of "primordial sea".
Except that Chiisai, like some primordial sea creature, was aware of those screams.
They used the great beasts of the primordial sea for their own purposes, controlling fantastic monsters known to mankind only through legend.
He sat on top of a sensor housing and gazed in awe at the primordial sea of a primitive planet.
The primordial sea, turbulent with the secret forces beneath, a sea wave growing bigger, curling in on itself, until, with an rush energy, it embraced them in a cataclysm, a rush of fiery lava meeting water with explosive steam in sparkling droplets of red and green and gold.
It was evening, with the sun almost completely set, and the towers looked like strange, unnatural rock formations, jutting from a primordial sea.
We blazed Lip together, bright as stars in the summer night, and then sank back burnt and limbless, ashes dissolved in a primordial sea of warm salt, stirring with the nascent throbbings of life.
Centered in the crystal-clear water, like a miniature volcano emerging from a primordial sea, stood a peaked island with a real waterfall flowing down one side.
One-celled life, striving fiercely upward in the primordial sea toward the light.