A Standard Biostratigraphic Sequence for the Devonian of Western North America

约翰逊对美国西部泥盆纪的研究包括 奋进的六个方面。 1.腕足动物分类学;三个新的 将描述和说明腕足动物属。 2. 腕足动物为主的群落;已知的群落超过30个 在内华达州的泥盆纪将进行分析， 在已建立的时间-岩石框架中的相对位置。 这 将是过去25年收集的数据的综合。 3. Eifelian、Frasnian晚期和Famennian早期牙形刺， 腕足动物序列将通过详细的采样， 尤里卡县北方羚羊山脉的测量剖面， 内华达州。 4.吉韦期和晚期的沉积历史 北方羚羊区弗拉斯期-早法门期岩石序列 范围将通过研究岩石解释在一些 牙形刺的年代测定。 吉韦蒂安人 事件的顺序就像是 加拿大 上弗拉斯期石灰岩中的石英砂属于西 推导 5. 它的目的是分析地质沿着 根据收集的数据， 在过去的12年里。 6. 将编写一份审查文件， 美国西部的古生代。

Johnson's research in the Devonian of the western U.S. involves six areas of endeavor. 1. Brachiopod systematics; three new brachiopod genera will be described and illustrated. 2. Brachiopod-dominated communities; more than 30 communities known in the Devonian of Nevada will be analyzed in terms of their relative positions in an established time-rock framework. This will be a synthesis of data collected during the last 25 years. 3. The Eifelian, late Frasnian, and early Famennian conodont and brachiopod sequences will be made known by detailed sampling of measured sections in the northern Antelope Range, Eureka County, Nevada. 4. The depositional history of Givetian and late Frasnian-early Famennian rock sequences in he northern Antelope Range will be interpreted by study of rocks in a number of measured sections that are well dated by conodonts. The Givetian sequence of events is like that of the Keg River barrier of Canada. Quartz sand in upper Frasnian limestones is of western derivation. 5. It is intended to analyze geology along the frontal margin of the Roberts Mountains thrust from data gathered during the last 12 years. 6. A review paper will be prepared on the Paleozoic of the Western United States.