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Hilda mega-bonebed
The Hilda mega-bonebed is a complex of fourteen distinct ''Centrosaurus apertus'' bonebeds discovered near the town of Hilda in Alberta, Canada. The Hilda mega-bonebed was first described in the scientific literature by David Eberth, Donald Brinkman, and Vaia Barkas in 2010 after more than ten years of research. The Hilda mega-bonebed is significant because the behavior of the preserved dinosaur themselves was the dominant cause of its existence, rather than the stratum's geological history like most bonebeds.〔 The Hilda mega-bonebed is also Canada's largest bonebed.〔
==History of research==
In 1959 Wann Langston, Jr. recorded evidence of a ''Centrosaurus'' bonebed near Hilda, Alberta. Later, between 1964 and 1966 Don Taylor of the Provincial Museum of Alberta (now called the Royal Alberta Museum) oversaw the collection of fossils from yet another bonebed in the same region.〔 These prospective bonebeds attracted the attention of scientists working for the Royal Tyrell Museum in the 1990s. The researchers sought to examine these potential bonebeds because they expected fewer breaks in continuity than the bonebeds have at Dinosaur Provincial Park. Geologically, this could be attributed to greater sediment accumulation since the Hilda site was closer to the Western Interior Seaway during the Cretaceous. The geography of the Hilda area also added to its promise because its general absence of badlands removed yet another potential source of discontinuity in the beds from consideration.〔 This stands in contrast with the rough terrain of Dinosaur Provincial Park, home to previously-studied ''Centrosaurus'' bonebeds, which made it difficult to tell if some of its own bonebeds were deposited separately or if singular events formed several simultaneously.〔 The ''Centrosaurus'' accumulations themselves could also potentially provide science with more information about the size of ceratopsid herds and therefore dinosaur social behavior.〔
In 1996, the Royal Tyrell Museum performed a preliminary survey of the bonebeds previously reported by Langston and Taylor.〔 While on site, even more centrosaur specimens and even entire bonebeds were discovered in the area.〔 The next year, in 1997, research at Hilda began in earnest.〔 After spending two days surveying the site, researchers discovered 14 separate bonebeds in one mudstone bed that extended for at least 7 km, with 3.7 km worth of visible outcrops in the valley walls.〔 By the conclusion of the research program, the scientists mapped the bonebeds and excavated the bonebed cataloged as H97-04.〔 They concluded that the Hilda bonebeds formed simultaneously when a herd consisting of thousands of ''Centrosaurus apertus'' drowned in a flood.〔 The researchers further speculated that some of the 17 ''Centrosaurus'' bonebeds of Dinosaur Provincial Park likely formed simultaneously in a manner analogous to the formation of the Hilda bonebeds, which the researchers estimated to be spread over 2.3 km.〔 The researchers only collected fossils and taphonomic data from the bonebed H97-04, although all the others were also examined to check the quality and number of preserved bones.〔 The research at Hilda was so complex that over ten years passed from the start of the project until David A. Eberth, Donald B. Brinkman, and Vaia Barkas published a formal description in the scientific literature.〔〔
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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