Kurgans were used in the Ukrainian and Russian steppes, their use spreading with migration into eastern, central, and northern Europe in the 3rd millennium BC.
The monuments of these cultures coincide with Scythian-Saka-Siberian monuments.
The 4th millennium BC spans the years 4000 through 3000 BC.
Some of the major changes in human culture during this time included the beginning of the Bronze Age and the invention of writing, which played a major role in starting recorded history.
"It likely flourished in the nutrient-rich dump sites of prehistoric hunters and gatherers," Warf wrote in his study.
Burned cannabis seeds have also been found in kurgan burial mounds in Siberia dating back to 3,000 B.
[11 Odd Facts About Marijuana] A second psychoactive species of the plant, , was named in 1924 by Russian botanist D. The history of cannabis use goes back as far as 12,000 years, which places the plant among humanity's oldest cultivated crops, according to information in the book "Marihuana: The First Twelve Thousand Years" (Springer, 1980).From the sites where prehistoric hunters and gatherers lived, to ancient China and Viking ships, cannabis has been used across the world for ages, and a new report presents the drug's colorful history.In the report, author Barney Warf describes how cannabis use originated thousands of years ago in Asia, and has since found its way to many regions of the world, eventually spreading to the Americas and the United States.In the case of Europe, one of the still unsolved enigmas is the origin and diversification of the Proto-Indo-European (PIE) language, considered the source of the majority of languages spoken today in Europe, Asia and America.In contrast to the Anatolian hypothesis, which defends that the diversification of PIE occurred some 8,500 years ago, when the first farmers from the Near East (currently Turkey) brought it to Europe, there is the Kurgan hypothesis, which proposes that the language was spread by nomadic herders of the steppes found to the north of the Black and Caspian Sea, and that their language spread throughout Europe after the invention of wheeled vehicles, from 6,000 to 5,000 years ago.The earliest kurgans date to the 4th millennium BC in the Caucasus, Kurgans were built in the Eneolithic, Bronze, Iron, Antiquity and Middle Ages, with ancient traditions still active in Southern Siberia and Central Asia.