Assertion: plesiosaur's jaw | /r/HasProperty | hasegawa
Facets:
Source sentences:
text: -- At the existing degree of decomposition, a plesiosaur would probably have retained its upper jaws and teeth (Hasegawa and Uyeno 1978, p 63), but no teeth were reported in the specimen carcass (Obata and Tomoda 1978, p 48).