primordial soup

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A liquid containing organic compounds and providing favorable conditions for the emergence and growth of life forms, from which life on Earth is thought to have arisen.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun informal The state of the Earth's oceans at a very early time in the planet's history, during the early development of multicellular organisms.