Taphonomy of Isisfordia duncani specimens from the Lower Cretaceous (upper Albian) portion of the Winton Formation, Isisford, central-west Queensland

Taphonomic analysis of fossil material can benefit from including the results of actualistic decay experiments. This is crucial in determining the autochthony or allochthony of fossils of juvenile and adult Isisfordia duncani, a basal eusuchian from the Lower Cretaceous (upper Albian) distal-fluvial-deltaic lower Winton Formation near Isisford. The taphonomic characteristics of the I. duncani fossils were documented using a combination of traditional taphonomic analysis alongside already published actualistic decay data from juvenile Crocodylus porosus carcasses. We found that the I. duncani holotype, paratypes, and referred specimens show little signs of weathering and no signs of abrasion. Disarticulated skeletal elements are often found in close proximity to the rest of the otherwise articulated skeleton. The isolated and disarticulated skeletal elements identified, commonly cranial, maxillary, and mandibular elements, are typical of lag deposits. The holotype QM F36211 and paratype ...化石材料的埋藏学分析若纳入现实腐解实验的结果，将可获得显著增益。这对于确定产自伊西斯福德附近下白垩统（阿尔布阶上部）远端河流-三角洲相温顿组下段的基底真鳄类——邓氏伊西斯鳄（Isisfordia duncani）的幼体与成体化石的原地埋藏（autochthony）或异地埋藏（allochthony）属性至关重要。本研究结合传统埋藏学分析方法与已发表的幼年湾鳄（Crocodylus porosus）尸体的现实腐解实验数据，对邓氏伊西斯鳄化石的埋藏学特征进行了记录。研究发现，邓氏伊西斯鳄的正模标本、副模标本以及归入标本几乎未出现风化痕迹，亦无磨蚀迹象。脱节的骨骼元素常与其余保持关节连接的骨架近距离伴生。本次识别出的孤立且脱节的骨骼元素多为颅骨、上颌骨与下颌骨构件，典型呈现滞留沉积的特征。正模标本QM F36211与副模……