José María Melgar y Serrano reported finding a gigantic carved stone head near Tres Zapotes (Veracruz), an early documented clue that later helped define Olmec monumental sculpture as a distinct archaeological phenomenon.
Frans Blom and Oliver La Farge (Tulane-sponsored) produced the first detailed descriptions of La Venta, an important step toward systematic documentation of Olmec sites before large-scale excavation began.
Matthew (and Marion) Stirling began focused fieldwork at Tres Zapotes, launching a sustained Smithsonian/National Geographic research program that helped establish the Olmec as an early Gulf Coast civilization.
During 1939 fieldwork at Tres Zapotes, Stirling’s team uncovered Stela C (notably its Long Count date) and advanced systematic excavation and documentation at the site, accelerating scholarly attention to Olmec chronology.
Stirling and Philip Drucker began the first major excavations at La Venta (Tabasco) under Smithsonian and National Geographic sponsorship, producing foundational stratigraphic data and site plans for the Olmec heartland.
The initial 1940–1943 research program at La Venta wrapped up, setting the stage for subsequent syntheses and later, more targeted excavations of Complex A and associated offerings.
A colossal head at San Lorenzo was discovered and partially excavated by Stirling, helping bring San Lorenzo Tenochtitlán into the core set of intensively studied Olmec centers.
A joint Smithsonian–National Geographic expedition carried out extensive 1946 fieldwork near San Lorenzo; contemporary reporting emphasized the site’s scale and the significance of its monumental sculpture in defining “La Venta culture” research trajectories.
Philip Drucker published major Smithsonian/Bureau of American Ethnology monographic reports on La Venta work, formalizing the early excavation results for broader scholarly use and comparative chronologies.
Stirling popularized the name “San Lorenzo Tenochtitlán” for the clustered sites near the modern villages, a nomenclatural step that helped consolidate research and publication under a shared site designation.
A later Smithsonian/BAE field program at La Venta (1955) was published as a substantial technical report by Drucker, Heizer, and Squier, expanding the site’s excavated sample and standard reference documentation.
Ann Cyphers began directing the long-running Proyecto Arqueológico San Lorenzo Tenochtitlán in the early 1990s, marking a shift toward large-scale, interdisciplinary excavation, coring, and settlement-pattern research at the site.
During the 1990s San Lorenzo research program, a tenth colossal head was reported as discovered (May 1994), adding to the site’s monumental corpus and informing interpretations of dynastic display and monument placement.
Artifacts from near La Venta at San Andrés (including a cylinder seal and greenstone plaque with glyphs) were published in Science, reframing research agendas on Olmec literacy, elite practice, and the broader investigation context around La Venta.
Archaeological excavations and research history of Olmec sites (late 19th century–present)
