Las Tortugas: A Clovis Site in the Gran Desierto

Las Tortugas is a recently identified Clovis site amongst the sand dunes of the Gran Desierto of Sonora, Mexico – many kilometers from known Clovis sites and the nearest sources of fresh water. Named for its abundant tortoise fossils, it provides new information on the extent of Clovis presence and terminal Pleistocene paleoclimate and vegetation in what is now the arid core of the Sonoran Desert.

Photo credit: BTW

The site’s Clovis point and associated typical Clovis artifacts suggest it was inhabited by people sometime between 13,400 and 12,700 years ago. This date range is supported by radiocarbon dating of the mammoth and camel molars. Fossils of the site are on the surface and record the presence of extinct late Pleistocene megafauna including mammoth, Pleistocene western camel, dwarf pronghorn, two size classes of tortoise, as well as coyote, peccary, mustelids, and abundant lagomorph remains.

The site is limited in spatial extent and is located at a low point where a paleo playa formed, which explains the concentration of artifacts and faunal remains. The playa is interpreted to have been seasonally (or longer) filled with water during the terminal Pleistocene. Investigations have revealed that the site is deflated and does not allow stratigraphic interpretation or dating, all faunal and cultural elements are on a single surface horizon.

Evidence of human presence at this paleo playa, the faunal assemblage, and abundances suggest this area may have supported more of a grassland habitat at the terminal Pleistocene. Such a habitat has not been reported for this portion of the paleo Sonoran Desert, hinting at the nature of the vast lowlands at the head of the Gulf of California thousands of years ago.

Collaborative research is ongoing with this team of project members:

  • Benjamin T. Wilder, project co-lead
  • Verlon M. Jose, Chairman Tohono O’odham Nation
  • Guadalupe Sánchez, project co-lead
  • John Carpenter, project co-lead (1957–2024)
  • Jay Quade, project co-lead
  • Jonathan Mabry, archaeologist
  • Kayla Beth Worthey, paleontologist
  • Robert A. Villa, naturalist
  • Trica Oshant Hawkins
  • Erin C. Riordan
  • Benjamin M. Johnson, artist
From left to right, Kayla Beth Worthey, Guadalupe Sánchez, Jay Quade, John Carpenter, Jonathan Mabry, Ben Wilder, Astrid Avilés, Adolfo León.