The Olmec Writing is Unique. The Signs are similar to the writing used by the Vai people of West Africa. The Olmecs spoke and aspect of the Manding (Malinke-Bambara) language spoken in West Africa.
If you don’t know Mande people are found in the United Sates as well, they are known as the Gullah Geechee
Both the Olmec and epi-Olmec had hieroglyphic writing systems. Olmec is a syllabic writing system used in the Olmec heartland from 900 BC- AD 450.
Rafinesque (1832) published an important paper on the Mayan writing that helped in the decipherment of the Olmec Writing. In this paper he discussed the fact that when the Mayan glyphs were broken down into their constituent parts, they were analogous to the ancient Libyco-Berber writing.
The Libyco-Berber writing can not be read in either Berber or Taurag, even though these people use an alphabetic script similar to the Libyco-Berber script which is syllabic CV and CVC in structure.
Constantine Samuel Rafinesque: A Voice in the American Wilderness
By Leonard Warren
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