Notes on verification

Widely supported by encyclopedic and museum sources that the Maya developed and extensively used the Long Count calendar, but academic/archaeological evidence suggests earlier Olmec or Epi-Olmec origins, with the earliest inscriptions predating confirmed Maya use by centuries. The claim holds in the popular sense but omits this nuance. [cascade flags: aggregator_dropped_primary_exists,wikipedia_dropped_other_sources_exist | tier=silver indep_score=0.833 clusters=3 claim_tier=notable | framework convergence=partial (upstreams: J. Eric S. Thompson's chronological work, Goodman-Martinez-Thompson (GMT) correlation, Archaeological stela dating (Tres Zapotes, Chiapa de Corzo, Tikal)) — publishers independent, evidence may not be | kind=empirical eligibility=medium (extractor: empirical/high)]