Abstract The ichnospecies Nummipera eocenica occurs in thick-bedded, tabular bioclastic massive sandstone of the upper Eocene San Jacinto Formation in the San Jacinto Fold Belt Basin, Colombia. Nummipera eocenica is a vertical to oblique burrow locally displaying a conical shape. The lining structure of the specimens studied consists of uniformly distributed lepidocyclinids and operculinids, with tests typically dipping towards the burrow wall, and well-compacted lining. The burrow infill is identical to the host rock, a bioclastic sandstone with abundant bivalve fragments. The diagnosis of Nummipera is emended to include as components of burrow lining all representatives of the Subclass Rotaliana characterized by being lenticular to discoidal in shape. In the San Jacinto Formation, Nummipera eocenica is present in the transition between deltaic mouth-bar and carbonate platform deposits.

中文翻译：

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来自哥伦比亚上始新世圣哈辛托组的装甲洞穴 Nummipera eocenica：形态和古环境影响

摘要 ichnospecies Numipera eocenica 出现在哥伦比亚圣哈辛托褶皱带盆地始新世圣哈辛托组上部的厚层、板状生物碎屑块状砂岩中。Numipera eocenica 是一个垂直到倾斜的洞穴，局部呈圆锥形。所研究的标本的衬砌结构由均匀分布的鳞环科动物和鳃科动物组成，测试通常向洞穴壁倾斜，并且衬砌良好。洞穴填充物与主岩相同，主岩是一种具有丰富双壳类碎片的生物碎屑砂岩。Numipera 的诊断被修正为包括作为洞穴衬里的组成部分的所有 Rotaliana 亚纲的代表，其特征是透镜状到盘状。在圣哈辛托组中，