Fossils recovered from a cave in Casablanca, Morocco, may sit near the very root of the human family tree, according to researchers who date the remains to about 773,000 years ago. The bones, described in a study published in Nature, show a mix of ancient and more modern features and are interpreted as belonging to an African population close to the last common ancestor of modern humans, Neanderthals, and Denisovans. The find fills a stubborn gap in the African fossil record.
Why the discovery matters
Human-origins research has long been hampered by a scarcity of fossils from a critical window. There is a relatively good record of African hominins up to about a million years ago, and again from roughly 500,000 years ago onward, but the stretch in between is nearly blank. That gap sits right where scientists expect the lineages leading to Homo sapiens, Neanderthals, and Denisovans to have branched apart, which makes any fossil from the interval unusually valuable.
The Moroccan remains land inside that gap. Researchers say the bones and teeth fill part of the African fossil record for the human evolutionary lineage from roughly one million to 600,000 years ago, a period that had been documented by almost nothing. In practical terms, that means the fossils offer a rare physical checkpoint for a chapter of human evolution that has mostly been inferred from genetics and from fossils on either side of the void.
The interpretation being advanced, that these individuals represent a population near the last common ancestor of three later human groups, is a strong claim precisely because it addresses that missing chapter. If it holds, the fossils would help anchor when and where the split occurred.
How the fossils were found and dated
The remains come from a cave known as the Grotte à Hominidés, within the Thomas Quarry complex in Casablanca. According to reporting on the discovery, the excavation yielded three jawbones, including one from a child, along with teeth, vertebrae, and a femur. That combination of skeletal elements from more than one individual gives researchers more than isolated teeth to work with, which strengthens anatomical comparisons.
The dating rests on a well-established geological marker. The team reports that the fossil-bearing layer coincides with the Matuyama-Brunhes transition, the most recent major reversal of Earth’s magnetic field, which is dated to about 773,000 years ago. Because that reversal is recorded worldwide and independently calibrated, tying the fossil layer to it provides an age estimate that does not depend solely on the bones themselves.
The anatomical argument comes from the fossils’ blend of traits. Researchers describe a mixture of primitive and more modern human characteristics, the kind of mosaic that would be expected in a population sitting near a branching point rather than firmly within any one later lineage. That mosaic is central to the claim that the group was basal, or close to the base, of the Homo sapiens line.
What is established and what is still open
Some elements of this find are firmer than others. The location, the roster of recovered bones, and the age tied to the Matuyama-Brunhes transition are concrete, sourced details. The interpretation that the population sits near the last common ancestor of Homo sapiens, Neanderthals, and Denisovans is the researchers’ reading of the anatomy, and claims of this kind in paleoanthropology are routinely tested and sometimes revised as other specialists weigh in.
Readers should therefore treat the “root of the family tree” framing as a hypothesis grounded in real fossils rather than a settled fact. The available coverage does not report a full species assignment beyond placing the fossils basal to the Homo sapiens lineage, and it does not detail how many individuals the remains represent in total. Those are the kinds of specifics that typically get sharpened through follow-up analysis and independent commentary.
What to watch next is how the wider research community responds to the Nature publication, and whether additional material emerges from the same cave. A single site that has already produced multiple jawbones and postcranial bones is the sort of place that can yield more, and each new fossil either reinforces or complicates the current interpretation. For now, the Moroccan cave has done something concrete regardless of how the debate settles: it has put physical evidence into one of the emptiest and most important stretches of the human fossil record.
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*This article was researched with the help of AI, with human editors creating the final content.
