"Flat plateau" refers to a large area of land that is completely level, with no steep slopes or hills. It is like a flat surface on top of a mountain or a hill. Full definition
The skulls do share traits with some other fossils in east Asia dating from 600,000 to 100,000 years ago that also defy easy classification, says paleoanthropologist Rick Potts of the Smithsonian National Museum of Natural History in Washington, D.C. Those features include a broad cranial base where the skull sits atop the spinal column and a low, flat plateau along the top of the skull. (sciencemag.org)
Interglacial trends over the past 400,000 years exhibit steep warming onsets, slower cooling rates and nearly flat plateaus. (co2coalition.org)
This is considered as one of the best dive sites in Bunaken Marine Park, as here you can find two walls meeting and a large flat plateau that drops to around 30 metres. (siladen.com)