Similarities in lithic (stone tool) production between Solutrean and Clovis artifacts, including bifacial points made with overshot flaking techniques, as well as other shared traits, such as caching behaviors and tool forms, are cited as evidence for this theory. We can also point to certain genetic markers, notably mtDNA haplogroup X2a, found in some Native American populations, common in eastern North America, which they suggest could indicate a pre-Columbian western Eurasian contribution, potentially filling chronological gaps left by pre-Clovis sites like Meadowcroft Rockshelter or Cactus Hill. While some see this theory as βfringeβ, it's only thought of as such because it would undermine the narrative that White Europeans donβt belong on the North American continent and βstoleβ the land from the Amerindian βNativesβ.