Primordial (adjective)

1. Existing at or from the beginning of time; original.
2. Belonging to the earliest stage of development.
3. Of or relating to primeval matter or the universe before the formation of the elements.

Origin:

Late 16th century: from latin primordialis, from primordium 'origin, first beginning'.

Examples:

1. The museum displayed many of the primordial species that once roamed the earth.
2. The study of the universe's primordial moments has long been a source of fascination.
3. The discovery of primordial gas clouds marked a major advance in our understanding of the early universe.
4. The primordial soup theory suggests that life originated from simple organic compounds.
5. The primordial landscape was dotted with volcanic cones, rivers and lakes.