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The problem with that idea is that well-preserved human remains were purposely buried; many (if not most) fossils of extinct forms are found in death assemblages, such as the 10000 dino-critters discovered in Montana by Jack Horner et al.

Early Volcano Victims Discovered
BBC News
Monday, May 3, 1999
Whole communities of ape-like creatures may have been killed in East Africa 18 million years ago by the once active volcano Kisingiri. Proconsul lived in a semi-arid environment close to the mountain and the research suggests they may have been caught by a pyroclastic flow. The abundance of the hominoid fossils may represent "death assemblages" - whole populations wiped out simultaneously by "glowing cloud" eruptions. The fossils of the Rusinga Formation form a crucial link between the early primates of the forest habitats, and human forerunners of the more open-country habitat, who lived in drier conditions than had been supposed, on a landscape that experienced repeated volcanic eruption.