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QUICK FACTS
Milestone: Fossil “Lucy” found
When: Nov. 24, 1974
The place: Hadar, Ethiopia
Who: Anthropologists Donald Johanson and Tom Grey
Greater than 50 years in the past, two anthropologists had been digging in Hadar, Ethiopia, once they noticed one thing glinting in a gully. What they discovered would rework the story of human evolution.
Later that night time, the staff excitedly mentioned the discover because the Beatles track “Lucy within the Sky with Diamonds” performed within the background. Crew member Pamela Alderman prompt the fossil be named “Lucy.”
“And it simply grew to become iconic,” Johanson informed Dwell Science in 2024. “A moniker that everyone knew.”
Over the following a number of weeks, the staff would dig up components of the cranium, rib cage, pelvis and limb bones of a 3.2 million-year-old human ancestor — on the time, the oldest and most full skeleton of a human ancestor ever discovered. It could turn out to be generally known as Australopithecus afarensis — and would rework our data of human evolution.
“Lucy” was so full that you could possibly nearly see her staring out at you throughout the eons. We have realized a lot about her life over time: that she had huge leg muscle mass for strolling and climbing bushes; that she would have been a foul runner as a consequence of in another way formed tendons and muscle mass in her calf; and that she possible used instruments.
“Lucy” additionally settled a debate that had been brewing within the subject. Lucy lived on the “midway level” in human evolution — about equidistant in time from each apes and trendy Homo sapiens. On the time, many anthropologists thought massive brains advanced earlier than upright strolling. However the diminutive, small-headed “Lucy” was clearly tailored to strolling on two legs. Most anthropologists now suppose A. afarensis represents a direct human ancestor.
Lucy’s discovery set the stage for the identification of even older archaic hominins, together with the well-known Ardipithecus ramidus fossil generally known as “Ardi.”
“The invention of Lucy actually hit the beginning button for wanting in older and older sediments in Africa,” John Kappelman, a paleoanthropologist on the College of Texas at Austin, beforehand informed Dwell Science.
Over time, scientists have unearthed greater than 500 A. afarensis fossils spanning one million years of evolutionary historical past, from websites in Tanzania, Kenya and Ethiopia. And we’ve got realized lots about how Lucy herself lived and died, and may even re-create her final day on Earth.
We now have additionally found that Lucy’s form lived in a world teeming with different human ancestors and relations. To date, anthropologists have recognized a number of Australopithecus species, in addition to different associated genera.
Because of fossils like Lucy and her relations, anthropologists are actually realizing that human evolutionary historical past is extra like a braided stream than a household tree.
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