Taphonomy of a monodominant <i>Gryposaurus</i> sp. bonebed from the Oldman Formation (Campanian) of Alberta, Canada
Taphonomy of a monodominant <i>Gryposaurus</i> sp. bonebed from the Oldman Formation (Campanian) of Alberta, Canada
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单显性<i>Gryposaurus</i> sp.的埋藏学。
DOI：
10.1139/cjes-2020-0200
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发表时间：
2022
影响因子：
1.4
通讯作者：
Ryan Michael J.
中科院分区：
文献类型：
--
作者：
Scott Evan E.;Chiba Kentaro;Fanti Federico;Saylor Beverly Z.;Evans David C.;Ryan Michael J.
单一优势的 Gryposaurussp。位于艾伯塔省南部坎帕尼亚奥德曼地层下部的骨床是该省有记录的最古老的鸭嘴龙骨床，也是第一个从该地层中描述的骨床。当地的沉积学和鸭嘴龙科物质的埋藏学表明，骨床代表了幼年体型个体的集合体，这些个体可能只是从死亡地点运输到了最终沉积并保存在河岸序列内的细粒泥岩中的很短距离。对六个肢体元素的组织学检查证实，所有个体都是青少年，有两个年龄组（死亡时年龄<1 岁和<2 岁），很可能死于同一事件。骨骼微观结构数据表明，格里波龙在记录的 2 年寿命中经历了快速生长，相当于北美的其他晚白垩世鸭嘴龙科动物。骨床的准本土性质，以及缺乏小型新生儿（新生儿）材料和几乎完全缺乏大型成年材料，表明骨床代表了一群隔离的幼年动物。这群不成熟的个体可能是一个自治单位，将自己从更大的社会群体中分离出来，可能是为了提高他们的生存能力。
A monodominantGryposaurussp. bonebed in the lower unit of the Campanian Oldman Formation of southern Alberta is the oldest hadrosauroid bonebed documented in the province and the first described from the formation. The sedimentology of the locality and the taphonomy of the hadrosaurid material indicates that the bonebed represents an assemblage of juvenile-sized individuals that were probably transported only a short distance from where they died to where they were finally deposited and preserved in a fine-grained mudstone within an overbank sequence. Histological examination of six limb elements confirms that all individuals are juveniles, with two age classes (<1 and <2 years of age at the time of death) that likely died in the same event. Bone microstructure data indicate thatGryposaurusexperienced rapid growth over the 2-year life spans documented, equivalent to other Late Cretaceous hadrosaurids in North America. The parautochthonous nature of the bonebed, and the lack of small neonate (newborn) material and almost complete lack of large adult material, suggests that the bonebed represents a segregated group of juveniles. This group of immature individuals may have been an autonomous unit that had separated itself from a larger social grouping, possibly in an effort to increase their survivability.