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Ladd Formation
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Ladd Formation : ウィキペディア英語版
Ladd Formation

The Ladd Formation is a Mesozoic geologic formation located in Orange County, California.
==Paleofauna==
Dinosaur remains (mainly hadrosaurid fragments) are among the fossils that have been recovered from the formation, although none have yet been referred to a specific genus.〔Weishampel, et al. (2004). "Dinosaur distribution." Pp. 517-607.〕 In 1927 Bernard Nettleton Moore found a hadrosaur maxilla with teeth while searching for ammonites in the formation. In 1950 Marlon V. Kirk found a plesiosaur centrum (spool of the vertebra). In 1978 Robert Drachuk, also while searching for ammonites, collected a hadrosaur cranial fragment from a limestone concretion. In 1992 Robert D. Hansen found the distal tibia of a hadrosaur.〔Hilton (2003), pp. 233-34, 241.〕

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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