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Toyonishi Group
The Toyonishi Group is a Group (stratigraphy), group of Mesozoic rock stratum, strata in Japan, and was originally named by Tatsuro Matsumoto in 1949.Matsumoto, T., 1949, The Late Mesozoic geological history in the Nagato Province, southwest Japan, ''Japan. Jour. Geol. Geogr.'', 21, pp. 235-243. It distributes in the southern half of Shimonoseki, Shimonoseki City, Yamaguchi Prefecture, southwest Japan, and deposited during the Uppermost Jurassic-Lower Cretaceous along the East Asian continental margin. Kawamura, H., 2010, Stratigraphic revision of the Jurassic Toyora Group of the southern part of the Tabe basin, Yamaguchi Prefecture, southwest Japan. ''Jour. Geol. Soc. Japan'', 116, pp. 27-44. (''in Japanese with English abstract'') Geology The Toyonishi Group is approximately 300–900 m thick, lies with a disconformity or a locally angular unconformity on the Jurassic Toyora Group, and is overlain with an unconformity by the Early Cretaceous Kanmon Group. It has been divide ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Group (stratigraphy)
In geology, a group is a lithostratigraphy, lithostratigraphic Stratigraphic unit, unit consisting of a series of related Geological formation, formations that have been classified together to form a group. Formations are the fundamental unit of stratigraphy. Groups may sometimes be combined into Supergroup (geology), supergroups. Groups are useful for showing relationships between formations, and they are also useful for small-scale mapping or for studying the stratigraphy of large regions. Geologists exploring a new area have sometimes defined groups when they believe the strata within the groups can be divided into formations during subsequent investigations of the area. It is possible for only some of the strata making up a group to be divided into formations. An example of a group is the Glen Canyon Group, which includes (in ascending order) the Wingate Sandstone, the Moenave Formation, the Kayenta Formation, and the Navajo Sandstone. Each of the formations can be distingui ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
