Dogon people
The Dogon people with whom French anthropologists Griaule and Germaine Dieterlen worked during the 1930s and 1940s had a system of signs which ran into the thousands, including "their own systems of astronomy and calendrical measurements, methods of calculation and extensive anatomical and physiological knowledge, as well as a systematic pharmacopoeia". The religion embraced many aspects of nature which are found in other traditional African religions.