毒条砂岩间坐落着东尼尸骨层(Tony's Bone Bed)—一个恐龙骨骼的主要集中产地。在此处被发觉之前仅得知可能的蜥结龙遗迹、一些在毒条带发现的兽脚类与蜥脚类的单独骨头。[11]直到1998年,丹佛自然史博物馆的志工们在距离毒条顶部之下3.75米处发现了东尼尸骨层。[12]东尼尸骨层中保存的化石质量呈现大幅落差,其中许多化石状态代表这些沉积物是逐渐积累而成的,许多骨头似乎在掩埋前受到踩踏,某些骨头末端遗失可能由食腐者所移除。没有任何骨头是彼此关节连接保存下来的。所有证据都显示这些动物从死亡到最终掩埋距离很长一段时间。东尼尸骨层可能是河道在旱季水位较低时随时间演进而累积起来的。[13]
雪松山组是几个主要的北美恐龙地层中最晚才被研究的。虽然早在1990年以前这里就发现过零星的化石碎片,但直到那年才首度获得深入研究。自当时起一些机构展开采集恐龙化石的野外考察活动,主要有奥克拉荷马自然史博物馆、丹佛自然科学博物馆、犹他州立大学东部分校、犹他地质调查局、杨百翰大学、恐龙国家纪念区(Dinosaur National Monument)等。这些研究显示雪松山组至少存在两个、甚至三个恐龙群集。
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