My search for scholarly articles about an early peopling of America struck gold today. I came across a post on a blog that was structured like a research paper, which is a nice detail. It was written by Riley Rogerson, and its title is Multi-Level Hominin Migration and Denisovan Presence in the Americas posted on 2025/07/09. It even includes bibliographic references. Well done!
You can read the post at Rogerson's blog, the white letters against a black background make it hard on the eyes (by the way, I also dislike the beige background I chose for my blog, but now it is too late to change it!). Below I summarize the main points and include links to any post I may have written about a specific item.
Abstract: "This theory proposes that Denisovans, an archaic hominin group closely related to Neanderthals, may have been the earliest hominin migrants to the Americas. A 130,000-year-old archaeological site in California suggests hominin activity long before anatomically modern humans are known to have left Africa. During this period, Denisovans inhabited Siberia and may have crossed the Beringia land bridge, establishing ephemeral populations in North America. These groups likely died out without descendants but left behind physical traces. Later, modern humans who interbred with Denisovans in Eurasia crossed into the Americas in intermittent migration waves taking place possibly as early as 37,000 years ago. Genetic findings in a 1,500-year-old skeleton from Uruguay confirm persistent Denisovan ancestry in Indigenous populations, supporting the idea of earlier, layered migrations. This model complicates the standard peopling narrative and opens new avenues for understanding pre-Clovis human history in the Americas."
The article looks into Monte Verde site in Chile (clearly Pre-Clovis, despite current arguments that it is much more recent), the 130 ky old mastodon bones from the Cerutti site in California, the Hartley site (37 ky) in New Mexico, and the 23 ky old footsteps from White Sands.
It correctly argues in favor of an Older Land Bridge between Asia and America: "During periods of low sea level, including Marine Isotope Stage 5e (~130,000 years ago), the Bering land bridge connected northeastern Asia to Alaska, providing a viable (though harsh) migration route for Pleistocene megafauna and, potentially, archaic hominins such as the Denisovans."
I found the comment of admixture within America (Denisovans and modern humans) extremely interesting; it explains the "...elevated Denisovan signature. First, it might indicate a major admixture event occurring in ancestral populations prior to entry into the Americas, resulting in sustained higher levels of Denisovan ancestry in certain lineages. It could alternatively reflect more complex regional population dynamics, such as secondary admixture events occurring within the Americas, potentially involving remnant populations carrying substantial Denisovan ancestry from earlier migrations. This hypothesis implies that Denisovan genetic influence in the Americas may not have been uniformly diluted over time but instead persisted regionally or was periodically refreshed by contacts with isolated groups."
The author argues that "Recent archaeological findings further complicate the picture. Several controversial sites in eastern Beringia, including Old Crow Basin, Chandalar River, and the deeper strata of Bluefish Caves, have produced lithic tools and faunal remains that some researchers interpret as evidence of hominin activity dating from approximately 80,000 to 100,000 years ago. These dates precede the known arrival of anatomically modern humans in northeast Asia, raising the possibility that these occupations reflect short-lived incursions by Denisovan groups during glacial periods when the Bering Land Bridge was exposed. While the artifact status of some materials is debated, the timing and geography align with what is known about Denisovan range and climate-accessible corridors."
The paper suggests some potential avenues for further research, including genetics: "high-resolution mapping of archaic DNA segments in Indigenous populations, may help distinguish between Denisovan ancestry acquired in Asia and ancestry potentially inherited from archaic populations present in the Americas. Third, paleoenvironmental reconstructions of Beringia during MIS 5e and related periods can refine our understanding of when and how migrations might have occurred."
The article is well structured and presents the evidence in a straightforward manner. No controversy, just facts. Well done!
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