Robuta

https://www.usgs.gov/media/images/trench-stratigraphy-dated-using-tree-rings-saltcedar-rio-puerco Trench stratigraphy dated using tree rings of saltcedar, Rio Puerco | U.S. Geological Survey Trench stratigraphy dated using tree rings of buried saltcedar, Rio Puerco near Highway 6, New Mexico (Friedman et al. 2005, 2015) tree ringsgeological surveytrenchstratigraphydated