Paisley Caves

Paisley Caves
BLM photo · Public domain · source
Name	Paisley Caves
Location	Lake County, Oregon, United States
Region	Summer Lake Basin
Type	Cave complex
Epochs	Late Pleistocene, Early Holocene
Cultures	Western Stemmed Tradition, Numic-speaking peoples
Excavations	1938, 1958–1969, 2002–2009
Archaeologists	Luther Cressman, Dennis Jenkins

Paisley Caves are a complex of dry caves and rock shelters in the Summer Lake Basin near the Fort Rock, eastern Oregon, notable for early human occupation claims and ancient organic remains. The site has produced controversial radiocarbon dates, human coprolites, Western Stemmed Tradition artifacts, and archaeological debates involving North American colonization models. Research at the caves has intersected institutions and figures from University of Oregon to the Smithsonian Institution and has informed discussions tied to the Clovis culture, Pre-Clovis hypothesis, and migration routes such as the Kelp Highway hypothesis and inland corridor theories.

Geography and Geology

The caves lie in high desert terrain of the Summer Lake Wildlife Area within Lake County, Oregon, near Paisley, Oregon and adjacent to the Fort Rock Basin. Geologically, the cavities are developed in Pleistocene tuffaceous and sedimentary sequences related to eruptions from the Newberry Volcano and regionally correlated with deposits in the Columbia River Basalt Group, influenced by late Pleistocene lacustrine cycles of Lake Chewaucan. Stratigraphy at the site demonstrates alternating aeolian silts, fluvial sands, and organic-rich paleosols that correlate with stadial and interstadial phases during the Younger Dryas and last glacial maximum. Nearby geomorphic features include the Fort Rock tuff ring, Summer Lake, and playa remnants tied to hydrological variability across the Great Basin and Columbia Plateau.

Archaeological Discoveries

Initial surface finds by Luther Cressman in the 1930s preceded systematic investigations by projects sponsored by the University of Oregon and later teams led by Dennis Jenkins. Excavations yielded lithic assemblages characterized by stemmed points attributed to the Western Stemmed Tradition, microblade fragments comparable to materials found at Gault Site, and chipped stone debitage consistent with obsidian procurement linked to sources such as the Obsidian Cliff quarries of Yellowstone National Park and local knapping locales near Hart Mountain. Organic finds included human coprolites examined by comparative analysts from the Smithsonian Institution and paleobotanical samples with macrobotanical remains analogous to assemblages from Marmes Rockshelter and Columbia River basin sites. Faunal remains include lagomorph bones similar to taxa recorded at Hudson-Meng Bison Bonebed and fish vertebrae paralleling remains from Fort Rock Basin wetland contexts. Stratified cultural horizons revealed hearth features and bone-working evidence comparable to Early Holocene components at Cove-Redwoods and Oregon archaeological sites.

Chronology and Dating Evidence

Radiocarbon assays performed at multiple laboratories produced pre-12,000 BP dates for coprolites and associated materials, prompting reassessment of the timing of human presence relative to the Clovis culture chronology anchored at ~13,000 BP. Accelerator Mass Spectrometry dates were central to debates paralleling chronometric controversies at Monte Verde, Meadowcroft Rockshelter, and Cactus Hill. Bayesian modeling incorporating stratigraphic constraints and radiocarbon offsets was applied akin to approaches used in analyses of the Channel Islands sea-level chronology and Koster Site sequences. Thermoluminescence and optically stimulated luminescence dating of sedimentary units have been used to corroborate radiocarbon results, in dialogue with regional chronostratigraphic frameworks from Lake Bonneville desiccation events and Sluiceway deposits.

Paleoenvironment and Subsistence

Paleoenvironmental reconstructions from pollen, phytoliths, and macroremains place occupations within a mosaic of marsh, riparian, and semi-arid sagebrush steppe settings analogous to paleoecological interpretations from Willamette Valley and Deschutes River corridors. Stable isotope studies on coprolites and faunal collagen invoked comparative datasets from Dust Cave and Blackwater Draw to infer diets dominated by marsh plants, camas-like geophytes paralleled in ethnobotanical records of Klamath and Paiute groups, and consumption of small mammals and freshwater fish reminiscent of subsistence at Channel Islands and Gulf Coastal sites. Evidence for resource scheduling and seasonal occupation aligns with settlement-subsistence models used to interpret seasonal rounds among Numic speakers and coastal-forager analogies posited in the Kelp Highway hypothesis.

Human Occupation and Cultural Implications

Claims of pre-Clovis human presence at the caves have major implications for models of peopling of Americas that include inland ice-free corridor migrations and coastal dispersals via the Pacific coast. The lithic and organic assemblages have been discussed in relation to cultural taxonomies such as Western Stemmed Tradition versus Clovis culture, comparative techno-typology work like that at Blackwater Draw and Gault Site, and behavioral interpretations involving early postglacial mobility comparable to data from Bull Brook and Monte Verde. The site has also intersected legal and ethical dialogues involving Native American Graves Protection and Repatriation Act consultations and collaborations with descendant communities including Confederated Tribes of Warm Springs and Burns Paiute Tribe.

Excavation History and Research Methods

Major fieldwork episodes began under Luther Cressman in 1938, followed by stratigraphic excavations and flotation sampling by teams from University of Oregon and later multidisciplinary campaigns led by Dennis Jenkins in the 2000s, incorporating specialists from the Smithsonian Institution, Oregon State University, and the University of California. Methods employed include controlled stratigraphic excavation, AMS radiocarbon sampling, micromorphology, palynology, zooarchaeology, and ancient DNA screening paralleling protocols refined at Anzick site and Rancholabrean bonebeds. Experimental archaeology studies replicated stemmed point manufacture drawing on comparative sequences from Gault Site and obsidian sourcing using X-ray fluorescence techniques similar to those applied at Obsidian Cliff studies. Ongoing research integrates GIS-based spatial analyses, Bayesian chronological modeling, and collaborative curation with museums such as the Museums of Natural and Cultural History.

Category:Archaeological sites in Oregon