The database holds 862 samples, mostly from France and Spain. Most date to 20,000-11,700 years ago (Solutrean and Magdalenian), yet the system was used identically for nearly 30,000 years. Researchers coined "RBS" (Relative to Bonason) for the spring-based interval calendar. Y marks correlate with birthing seasons, while unmarked numbers track mating seasons for aurochs, bison, horse, mammoth, and fish.
Animal mating and birthing seasons match tally mark patterns in cave art across 30,000 years
Key facts
- Database contains 862 samples: 60 without Y symbol, 256 with Y symbol, largely from France and Spain but also further east
- Most samples date to the late Upper Paleolithic, approximately 20,000 to 11,700 years ago (Solutrean and Magdalenian periods)
- System was used identically across nearly 30,000 years from the Aurignacian to Magdalenian
- Researchers coined term RBS (Relative to Bonason) to describe the relative interval-based calendar starting from spring thaw
- Y symbol correlates with animal birthing seasons; marks without Y correlate with mating seasons, particularly for aurochs, bison, horse, mammoth, and fish
Sources
BSOM Planning Calendars | Office of Medical Education | ECUmedicine.ecu.edu
BSOM Planning Calendars. Class of 2026 · Class of 2027 · Class of 2028 · Class of 2029 · Class of 2030. East Carolina University Office of Medical Education.
Calendar - Roaring Brook School - Avon Public Schoolsrbs.avon.k12.ct.us
The current school year calendar is available on the District Calendar webpage. 30 Old Wheeler Road, Avon, CT 06001 | Phone 860-404-4810 | Fax 860-404-4813
Calendar - RBS Solutionsrbssolutions.com
All weekday classes begin at 8AM and end at 5PM. All weekend classes are 5PM – 9PM Friday and are 8AM – 6PM Saturday & Sunday.
Calendar - RBS Belgrade international business schoolrbs.mba
Calendar ; 24-26 Mar 2028 · The future of business & Disruptive Innovation ; 25-27 Feb 2028 · Leadership ; 21-23 Jan 2028 · Personal development ; 3-5 Dec 2027.
Academic Calendar & Catalog | Bon Secoursbsmcon.edu
BSN Summer 2026: 8 Weeks ; May 22, Friday, Tuition and fees for the summer term are due by 12 noon ; May 25, Monday, Memorial Day - No Classes - College Closed.
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