It also lacked classic Neanderthal features such as the distinctive occipital "chignon" - a bulge at the rear of the skull and shaped like a bun.
And he said it's not impossible that we might find Homo sapiens fossils of similar age to the Moroccan remains in Europe or Asia at around the same time.
Nearly all human-origin specialists agree that modern humans evolved somewhere in Africa.
This is more than just a quirk of history - it puts a new, unexpected constraint on the "Out of Africa" theory, the dominant model of early migration of anatomically modern humans (Homo sapiens).
Last year United States scientists reported the discovery of a jawbone in Israel that was the oldest known human remains found outside of Africa. The second skull, which retains a face, was studied the most and identified as Neanderthal, according to The Guardian.
The research team ended up creating virtual reconstructions of parts of the skull and used a radiometric dating method - one that analyses the decay of uranium to determine the age.More news: England beat Australia to reach Cricket World Cup final
"It shows that the early dispersal of Homo sapiens out of Africa not only occurred earlier, before 200,000 years ago, but also reached further geographically, all the way to Europe", Katerina Harvati, a palaeoanthropologist at the Eberhard Karls University of Tuebingen, Germany, told AFP.
The group says the finding proves that modern humans left the African continent tens of thousands of years earlier than believed until now, and crossed paths with Neanderthals and other human species.
"The specimen is more than 150,000 older than the oldest modern human specimens known from Europe until now".
At the time, the discovery in Morocco was something of a shock, because the DNA evidence suggested that all humans alive today outside of Africa can trace their ancestry back to a major migration event out of the continent that happened between 70,000 and 50,000 years ago.
The results confirmed that Apidima 2 belonged to a Neanderthal who lived about 170,000 years ago.
Hominins - a subset of great apes that includes Homo sapiens and Neanderthals - are believed to have emerged in Africa more than six million years ago.
But these earliest Homo sapiens voyagers died out while local Neanderthal populations persisted, she said. "I would suspect (that) small populations made it all the way to Greece - smaller than the source populations in Israel or in Africa".More news: Federer, Nadal braced for Wimbledon epic
The fossilised and Neanderthal skulls were discovered in southern Greece in the late 1970s but they had not been described in detail.
Initially, scientists thought them to be Neanderthal.
By comparing it with recent human skulls the analysis identified the individual as an early member of H. sapiens.
Lead researcher Professor Katerina Harvati, from the University of Tubingen, added: "Our results suggest that at least two groups of people lived in the Middle Pleistocene in what is now southern Greece: an early population of Homo sapiens and, later, a group of Neanderthals".
The breccia was dated to between 100,000 and 190,000 years old at the time. Arsuaga was part of a 2017 study that dated Apidima 2 to approximately 160,000 years ago. The cranial analyses indicate that the latter were later displaced by newly arrived anatomically modern humans.
From here the species developed into modern humans in several places at once.More news: Duane 'Dog' Chapman Tearfully Shares Beth Chapman's Final Moments