Scientists have identified a new geological time scale called the “Megala era” – a period that began 4,200 years ago and experienced sudden droughts and cooling on a global scale.
Sediments collected by international research teams, including sediment from a cave stalagmite in Meghalaya, helped determine the smallest climate events in Earth’s history.
The agriculture-based society that developed in several areas after the last ice age was severely affected by 200 years of climate events, leading to civilizations in Egypt, Greece, Syria, Palestine, Mesopotamia, and the Indus. The collapse of human migration in the valley and the Yangtze River basin.
Evidence of 4,200 climate events has been found on all seven continents. After years of research, the late Holocene Megalarian era was approved as the latest unit of geological time scale.
The other two eras: the age of the Northern Holocene and the early Holocene Greenland era were defined in climate events of approximately 8,300 and 11,700 years ago.
These three eras include the Holocene era, which represents the time since the end of the last ice age.
Stanley Finney, professor and secretary general of Long Beach State University in the United States, said that the Megalarian era is unique in many intervals on the geological time scale because its beginning coincides with global cultural events generated by global climate events. The International Union of Geological Sciences (IUGS) is in France.
The International Stratigraphic Committee responsible for standardizing geological time-scales approved the definition of the beginning of the youngest unit of geological time-scale based on the time of the event.
The committee then forwarded the proposals to their parent organization, IUGS, for consideration, and the IUGS Executive Committee voted unanimously to approve the proposals.
The geological time-scale units are based on sedimentary formations that accumulate over time, including sediment types, fossils and chemical isotopes, recording the passage of time and the physical and biological events that produce them.
The three new eras of the Holocene era are represented by a large number of sediments that are found throughout the seabed, lake bottoms, glaciers, and calcite layers in stalactites and stalagmites.
The age-based separation of the sedimentary strata is called the stage, and the three new stages of the hierarchy together form the Holocene series.
The specific levels of the Greenland ice nucleus and the Greenland ice nucleus define the lower bounds of Greenland and Northern Gripping. The lower boundary of the Meghalayan stage defines a specific level in a cave of stalagmites in northeastern India.
Ice cores and stalagmites are now identified as international geological standards and placed in protected archives for further study.
The decision to identify these new phases of the Holocene series and the three new corresponding ages of the Holocene era allows for the renewal of the International Age Stratigraphic Map, which depicts a timeline of the Earth’s complete geological history.