Integrated Biostratigraphic Standard of Reference for the Lower Devonian (Lochkovian) Using Conodonts and Graptolite Lineages

这项研究将继续研究，寻求建立一个 下白垩统综合生物地层学参考标准 北美西部的泥盆纪动物群 牙形石和笔石内部变异的定量研究 谱系，并将介形虫动物群添加到合成中。 一个 综合和详细的参考标准是必要的， 了解古生物学的地理学问题， 生物相和演化模式。 还要求解决 地层和构造问题需要高度的 分辨率 这样的研究在文献中很少见，因为 成功的必要因素很少同时存在， 遇到的。 以前的定量研究较低 内华达州中部的泥盆纪已经证明了 进行牙形石谱系的统计研究， 目的. 这些研究的副产品表明， 此外，还发现了重要的下泥盆统牙形石谱系 全部或部分地在几个已知的部分或延伸部分中， 他们 这些部分位于Toquima山脉， 辛普森公园山脉、莫尼特山脉和罗伯茨山脉 并形成了目前已知的主要数据库 牙形石和笔石生物地层的研究 列在该地区。 对几个谱系的研究表明， 以及这些研究在实现 稳定的分类。 两者都是必要的成分， 详细而稳定的生物地层学参考标准。

The research will continue studies that seek to establish an integrated biostratigraphic standard of reference for Lower Devonian faunas of western North America Cordillera based on quantitative studies of variation within conodont and graptolite lineages and will add ostracode faunas to the synthesis. An integrated and detailed standard of reference is necessary to an understanding of paleobiological problems of biogeography, biofacies and patterns of evolution. It is also required to solve stratigraphic and structural problems requiring a high degree of resolution. Such studies are rare in the literature because the concurrence of the factors necessary for success is rarely encountered. Previous quantitative studies of the lower Lower Devonian in central Nevada have demonstrated the utility of conducting statistical studies of conodont lineages for this purpose. By-products of these studies indicate that a number of additional important Lower Devonian conodont lineages are present entirely or in part in several known sections or extensions of them. These sections are located in the Toquima Range, the Simpson Park Range, the Monitor Range and the Roberts Mountains and have formed the primary data base for what is presently known of conodont and graptolite biostratigraphy of this part of the column in the region. Study of several lineages has shown the enhancement of correlation that can be attained and the utility of such studies in attaining a stable classification. Both are ingredients necessary to a detailed and stable biostratigraphic standard of reference.