Abstract Multiple well-preserved molds of a fossil stalk-like structure are in erect positions in marine limestone beds in the upper part of the upper Albian Fort Lancaster Limestone exposed in West Texas. The Albian molds have a seven-sided cross section and seven vertical ribs that are separated by shallow furrows; the ribs bear closely spaced rings surrounding shallow depressions. The Fort Lancaster Limestone is the uppermost Albian cyclical carbonate unit deposited on the Barremian–early Cenomanian Comanche Shelf and is about 104 Ma to 100 Ma in age. These molds represent Coliculus septimus gen. et sp. nov., which, in cross section, is analogous to that of the horsetail Equisetum L., and occupies a shallow marine environment as do modern large rooted alga and marine grasses. Discovery of molds of a plant stem in strata at about 100 Ma extends the geologic range of marine plants other than algae. These molds are named and described so that they may be recognized in other Cretaceous strata.

中文翻译：

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下白垩纪（上阿尔比安）神秘的植物状柱状结构，得克萨斯州科曼奇海陆架

摘要 在西德克萨斯州出露的上阿尔比安兰开斯特堡石灰岩上部的海相石灰岩层中，多个保存完好的化石茎状结构模具直立。Albian 模具具有七边形横截面和七个由浅沟隔开的垂直肋；肋骨带有围绕浅凹陷的紧密间隔的环。Fort Lancaster Limestone 是沉积在 Barremian-Early Cenomanian Comanche 陆架上的最上面的阿尔比循环碳酸盐单元，年龄约为 104 Ma 至 100 Ma。这些模具代表 Coliculus septimus gen。等 sp. 11 月，其横截面类似于木贼木的横截面，并且与现代大型有根藻类和海草一样占据浅海环境。在约 100 Ma 地层中发现植物茎的霉菌，扩展了海藻以外的海洋植物的地质范围。这些模具被命名和描述，以便它们可以在其他白垩纪地层中被识别。