Problematic Receptaculitid Fossils from Western Utah and Eastern Nevada
Problematic Receptaculitid Fossils from Western Utah and Eastern Nevada
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发表时间：
2009
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通讯作者：
S. Church
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作者：
S. Church
摘要犹他州西部和内华达州东部早中奥陶世碳酸盐岩在孤立的生境中保存了有问题的容器状化石，并作为广泛的奥陶系浅层碳酸盐陆架上生物礁和海绵-微生物礁建造的共同成分。在整个碳酸盐陆架中，广泛分布着石灰石和石灰石。犹他州和内华达州的花托是几何美学的，表现出独特的螺旋体表面图案，由在所有花托中发现的单个Merom结构元件构建。从圆锥形、圆柱形和不完整的盘状形状到完整的开放的杯状形状，陆架碳酸盐中出现了一系列的容器状体形。尽管古生物学家在190多年的研究中做出了坚定的努力，但在王国水平上对受器类的分类关系仍然不清楚。然而，犹他州西部海鞘的穿孔形态表明，早期的海鞘功能类似于悬浮食性生物，可能与滤食性孔虫有亲缘关系。
Abstract Early to Middle Ordovician carbonate rocks in western Utah and eastern Nevada preserve problematic receptaculitid fossils in solitary habitats and as common constituents of biohermal and sponge-microbialite reef buildups on a broad Ordovician shallow carbonate shelf. Both calathid and ischadid receptaculitids are widely distributed throughout the carbonate shelf. Utah and Nevada receptaculitids are geometrically aesthetic, exhibiting distinctive helicospiral surface patterns constructed by the individual merom structural elements found in all receptaculitids. An array of receptaculitid body shapes occur in the shelfal carbonates ranging from conical, cylindrical, and incomplete discoidal forms to complete, open cupshaped forms. Despite the determined efforts of paleontologists in conducting studies spanning over one hundred-ninety years, taxonomic affiliations for receptaculitids at the kingdom level remain unclear. The perforate morphology of calathid receptaculitids from western Utah, however, implies early receptaculitid functionality analogous to suspension-feeding organisms and probable relationship to the filter-feeding poriferans.