The Yogyakarta Archeology Center team revealed Homo erectus bumiayuensis in 2019. The fossil appeared as the oldest ancient human on the island of Java, even the archipelago. The ages range from 1.7 to 1.8 million years, based on the reconstruction of the lower part of the Kaliglagah Formation.
When was the first landing of this ancient man in the archipelago? To answer this case, it is necessary to use the dating results based on stratigraphic analysis, and absolute dating tests through radiometric analysis.
"We have continued to do this from the stratigraphic correlation for each river there. All the rivers have been correlated. However, what we convey is interpretation," said Harry Widianto, Principal Researcher at the Yogyakarta Archeology Center. "What we need now is absolute dating, where this fossil must be radiometrically stripped."
His team found that Homo erectus bumiayuensis's research was colored with various updates such as the migration process of fauna. This finding also provides the geographical distribution of ancient humans to new areas, namely to West Java. This finding is spectacular because so far the information that is known only occupies the eastern part of Central Java and East Java.
Earlier archeologists argued that humans were interpreted to have been present 1.5 million years ago at Sangiran. However, Bumiayu's findings disprove this notion. It turns out humans have been wandering since 1.7-1.8 million years ago.
This finding also questions the Out of Africa theory. Because, the age of Homo erectus bumiayuensis shows ancient humans have migrated from Africa much older than expected.
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Homo erectus bumiayuensis was first discovered by a fossil conservationist named Karsono. He found two femoral head (femoral head) and one bone fragment in the brown diaphysis section of Kali Bodas in early 2019.
Kali Bodas is located about three kilometers west of Bumiayu City. Precisely in Bledong Hamlet, Bumiayu Village, Bumiayu District. The river flows intermenen, which is a watery river only during the rainy season.
Then the research team from the Yogyakarta Archaeological Center identified Karsono's findings to determine the relative dating.
Based on a team survey, two bone stumps are in two different locations. However, the discovery was on the surface of the river which was composed by lithology of the Kaliglagah Formation.
At the same event, Agus Tri Hascaryo, Geoarcheologist of the Yogyakarta Archaeological Center revealed the geological aspects of the finding site. "In Bumiayu there are tertiary and quarterly rocks. There are Kaliglagah Formations, Kaligintung Formations and river sediment terraces," he said. "Geologically, the fossil was found on the surface of the river. This is where we can do tracking later."
Homo erectus has a long, fairy-faced skull structure. The skull can reach three centimeters thick, and has a small brain volume. Harry continued that there was a possibility of the discovery of Homo Erectus outside of Java - such as in Kalimantan and Sumatra. Because at that time the two mainland was still united as Sundanese exposure.
Why is this fossil preserved in Java? This island is more "beneficial" for archeologists because the land has volcanic deposits. The intended advantage is that land in Java tends to preserve bone. On the contrary, Kalimantan has more swamp that is malignant with bones. The marsh will destroy bones for a period of five to ten years.
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