A Standard Biostratigraphic Sequence for the Devonian of Western North America

约翰逊在美国西部泥盆纪的研究涉及六个领域。1. Brachiopod分类学;将描述和说明三个新的腕足动物属。2. Brachiopod-dominated社区;在内华达州泥盆纪已知的30多个群落将根据它们在既定时间-岩石框架中的相对位置进行分析。这将是对过去25年收集的数据的综合。3. 通过对内华达州尤里卡县北部羚羊山脉的测量剖面进行详细采样，将了解埃弗勒纪、弗拉斯纪晚期和法门纪早期的牙形石和腕足动物序列。Antelope山脉北部的Givetian和frasian晚期- Famennian早期岩石序列的沉积历史将通过对大量测量剖面的岩石研究来解释，这些测量剖面通过牙形刺确定了年代。吉田的事件序列类似于加拿大的桶河屏障。上弗拉斯纪灰岩中的石英砂是西源性的。5. 它的目的是根据过去12年收集的数据，分析罗伯茨山脉前缘的地质情况。6. 将编写一篇关于美国西部古生代的综述论文。

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.