Scientific research in the alluvial plain, particularly on United Fruit Company properties, began in the 1940s with the work of Doris Zemurray Stone and Samuel Lothrop.
Lothrop's work focused on excavation at a handful of sites, one being Farm 4.
His work aimed to document all archaeological sites containing "in situ" stone spheres, to record the number of spheres and their dimensions, and to make detailed maps illustrating both their arrangement and alignments.

After the work of Lothrop and Stone, research in the area took a hiatus for nearly fifty years.
 In the 1990s, Claude Baudez and a team of researchers set out to establish a ceramic chronology of the region by observing the change in ceramic styles over time.
This was accomplished by examining the drainage ditches that were cut into the landscape by the UFCO.
Research carried out by Ifigenia Quintanilla, under the direction of the MNCR from 1991–1996 was performed in the region under the project titled "Man and Environment in Sierpe-Terraba" focusing on settlement patterns, occupational sequences, and resources utilized in the region.

Francisco Corrales and Adrian Badilla, archaeologists with the Museo Nacional de Costa Rica, have performed continuous research in the region since 2002.
 Their research began in 2002 and focused on four archaeological sites in the region containing stone spheres and of which comprise a "circuit".
These sites include Grijalba, Batambal, El Silencio, and "Farm 6".
The purpose of the project was to assess the cultural significance of the sites, to protect the cultural heritage, in addition to beginning research and studies at the sites.
Corrales and Badilla produced a booklet entitled El Paisaje Cultural del Delta del Diquís which provides a quick overview on the history of the Diquís Delta, the history of banana plantations and the UFCO, the natural environment, archaeological sites in the region, and the importance of the Diquís region as an UNESCO World Heritage Site.
 Research has continued in the region by Corrales and Badilla focusing on the archaeology and the Precolumbian political structure in the Diquís Delta.
Research emphasis was on chiefdoms and their associated archaeological indicators.
Their objectives were to study the archaeological sites containing stone spheres in the Diquís Subregion to gain an understanding of community configuration, activity areas, sequences of occupation, and the recording of monumental architecture.
Scientific research in the alluvial plain, particularly on United Fruit Company properties, began in the 1940s with the work of Doris Zemurray Stone and Samuel Lothrop. Lothrop's work focused on excavation at a handful of sites, one being Farm 4. His work aimed to document all archaeological sites containing "in situ" stone spheres, to record the number of spheres and their dimensions, and to make detailed maps illustrating both their arrangement and alignments.
After the work of Lothrop and Stone, research in the area took a hiatus for nearly fifty years.  In the 1990s, Claude Baudez and a team of researchers set out to establish a ceramic chronology of the region by observing the change in ceramic styles over time. This was accomplished by examining the drainage ditches that were cut into the landscape by the UFCO. Research carried out by Ifigenia Quintanilla, under the direction of the MNCR from 1991–1996 was performed in the region under the project titled "Man and Environment in Sierpe-Terraba" focusing on settlement patterns, occupational sequences, and resources utilized in the region.
Francisco Corrales and Adrian Badilla, archaeologists with the Museo Nacional de Costa Rica, have performed continuous research in the region since 2002.  Their research began in 2002 and focused on four archaeological sites in the region containing stone spheres and of which comprise a "circuit". These sites include Grijalba, Batambal, El Silencio, and "Farm 6". The purpose of the project was to assess the cultural significance of the sites, to protect the cultural heritage, in addition to beginning research and studies at the sites. Corrales and Badilla produced a booklet entitled El Paisaje Cultural del Delta del Diquís which provides a quick overview on the history of the Diquís Delta, the history of banana plantations and the UFCO, the natural environment, archaeological sites in the region, and the importance of the Diquís region as an UNESCO World Heritage Site.  Research has continued in the region by Corrales and Badilla focusing on the archaeology and the Precolumbian political structure in the Diquís Delta. Research emphasis was on chiefdoms and their associated archaeological indicators. Their objectives were to study the archaeological sites containing stone spheres in the Diquís Subregion to gain an understanding of community configuration, activity areas, sequences of occupation, and the recording of monumental architecture.
Stone spheres of Costa Rica