What is "eburonian"

The Eburonian ( or Eburonium), or, much less commonly, the Eburonian Stage, is a glacial complex in the Calabrian stage of the Pleistocene epoch and lies between the Tegelen and the Waalian interglacial. The transition from the Tegelen to the Eburonian started about 1.78 million years ago, lasted 480,000 years (to 1.3 million years ago), its base marking the boundary between the Neogene and Quaternary deposits of the Netherlands.