Assertion: mastodon's bone | /r/HasProperty | tested by one of the authors
Facets:
Source sentences:
text: Arguably, one of the most precise methods of obtaining dates for artifacts from the past seventy thousand or so years is carbon-14 (C-14), or radiocarbon, dating; however, for various reasons, many if not most of the bones and teeth tested by one of the authors (Miller) lack sufficient collagen (an animal protein useful in C-14 dating) for this process.