A team of archaeologists has found a stone tool in a cave in Tuyen Quang province, in vietnam, which is supposed to be a 4,000-year-old early calendar.
The stone tool, with 23 parallel lines carved, it would appear to be an instrument by which the Moon's calendarcommented Professor Chung Trinh Nang of the Vietnam Archeology Institute.
A similar tool It was found in Na Cooc cave, north of Thai Nguyen’s province, Phu Luong district, in 1985. Similar items have been found in various parts of the world such as China, Israel or UK, which suggests that 5,000 years ago people knew how to calculate the lunar calendar and carved it into stones.
This stone tool was found in a tomb marked with 14 large stones. The bones were found under the stones, but the skull could not be found, so Chung believes that more must have been buried due to the humidity of the cave. Along with the corpse, a variety of stone tools also appeared, the expert added.
The excavation was carried out in a total area of 20 square meters, unearthing about 400 objects in a depth that reached 1.20 meters, and belonging to two different cultural layers: Late Neolithic (4,000 - 4,200 years), and at the Age of metals (approx. 3,000 - 3,500 years).
The deepest layer (late Neolithic), it was one meter thick and they found very well polished axes and other stone tools, while in the next layer (Age of metals), only 20 centimeters thick, were found tools with shafts and ceramic parts.
They also found a large number of animal teeth and shells, believing that they are remains of food left in the place by the ancient settlers. Scientists also found charcoal remains in both layers.
This cave was discovered in May of last year, but in the same province other excavations have been carried out where remains of human populations dating from 7,000-8,000 years old.
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