A new trace fossil, Feoichnus martini new ichnospecies, from the Two Medicine Formation is here described. This ichnotaxon is reported from the upper Campanian deposits of the Egg Mountain locality (Montana) and consists of a hemispherical to hemiellipsoidal structure with a truncated upper edge, and a regular, rounded lower edge marked by a lined border composed of stained layers. The trace maker likely impregnated the border using organic fluids. The simple lined wall observed in F. martini n. isp. suggests that the structure was produced by an invertebrate soil-dwelling organism, likely an insect. Specimens are preserved as casts in calcitic Inseptisols alongside an abundant vertebrate fossil record composed by dinosaurian and nondinosaurian fossil remains, dinosaur eggs and nest structures, and pervasive insect bioturbation. Feoichnus martini n. isp. represents an additional, minor component of the impoverished Celliforma ichnofacies reported at Egg Mountain and expands the paleogeographical distribution of the ichnogenus Feoichnus Krause et al., 2008 to the Upper Cretaceous deposits of Montana, USA.UUID: http://zoobank.org/7c1a5026-7f27-4f12-a9fb-1eb8daa93baf

中文翻译：

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一种新的陆地痕迹化石 Feoichnus martini n。ISP。来自上白垩纪二药组（美国）

一种新的痕迹化石，马提尼马提尼此处描述了来自二药组的新鱼种。据报道，该 ichnotaxon 来自 Egg Mountain 地区（蒙大拿州）的上坎帕尼亚沉积物，由半球形至半椭球体结构组成，具有截断的上边缘和规则的圆形下边缘，由染色层组成的内衬边界标记。痕迹制造者可能使用有机液体浸渍边界。观察到的简单的内衬墙F.马提尼n. ISP。表明该结构是由一种居住在土壤中的无脊椎动物产生的，可能是一种昆虫。标本被保存在钙质 Inseptisol 中，与由恐龙和非恐龙化石残骸、恐龙蛋和巢穴结构以及普遍的昆虫生物扰动组成的丰富的脊椎动物化石记录一起保存。马提尼马提尼n. ISP。代表贫困人口的额外的、次要的组成部分蜂窝状在蛋山报告的 ichnofacies 并扩大了 ichnogenus 的古地理分布费奥希努斯Krause 等人，2008 年对美国蒙大拿州上白垩统沉积物。UUID：http://zoobank.org/7c1a5026-7f27-4f12-a9fb-1eb8daa93baf