Were Mastodons Butchered at the 100,000 Year-Old Cerrutti Site Near San Diego, CA?

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Were cobbles used intentionally to break mastodon bones at Cerutti Mastodon? If so, were hominins inhabiting the New World much earlier than previously thought?

Dig Labs Collaborative ResearchHelp us investigate these questions further. Review the current state of research surrounding this topic, suggest new sources, or share your expertise. Every contribution helps.
Dig Labs Collaborative ResearchHelp us investigate these questions further. Review the current state of research surrounding this topic, suggest new sources, or share your expertise. Every contribution helps.
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Introduction

Broken mastodon bones were found in 2017 near San Diego, California, at the paleontological and possibly archaeological site now known as the Cerutti Mastodon site. There were no known Pleistocene carnivores capable of breaking fresh proboscidean femora at mid-shaft, but these bones showed marks of wear-and-tear, and lay next to cobbles supposedly used as hammerstones and anvils.

Were these cobbles used intentionally by hominins to break the mastodon bones? If true, does this mean hominins were inhabiting the New World much earlier than previously thought?