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Joli Fou Formation
The Joli Fou Formation is a allostratigraphy, allostratigraphical unit of middle Albian Geochronology, age in the Western Canadian Sedimentary Basin. It takes the name from the Joli Fou Rapids on the Athabasca River, and was first described in an outcrop along the river, downstream from Joli Fou Rapids, by RTD Wickenden in 1949.Wickenden, R.T.D., 1949. Some Cretaceous sections along the Athabasca River from the mouth of Calling River to below Grand Rapids, Alberta (Report and Figure); Geological Survey of Canada, Paper 49-15, 31 p. and Figure 1, Sketch map of area along Athabasca River in Alberta, showing positions of bedrock outcrops and geological sections examined, Scale: 1 Inch to 4 Miles Lithology The Joli Fou Formation is composed of shale with minor sandstone lenses. The shale is non-calcareous, dark grey, while the sandstone lenses are fine to minor medium grained, quartzose or micaceous. In central Saskatchewan, the unit contains glauconite, glauconitic sandstone and mud ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geological Formation
A geological formation, or simply formation, is a body of rock having a consistent set of physical characteristics ( lithology) that distinguishes it from adjacent bodies of rock, and which occupies a particular position in the layers of rock exposed in a geographical region (the stratigraphic column). It is the fundamental unit of lithostratigraphy, the study of strata or rock layers. A formation must be large enough that it can be mapped at the surface or traced in the subsurface. Formations are otherwise not defined by the thickness of their rock strata, which can vary widely. They are usually, but not universally, tabular in form. They may consist of a single lithology (rock type), or of alternating beds of two or more lithologies, or even a heterogeneous mixture of lithologies, so long as this distinguishes them from adjacent bodies of rock. The concept of a geologic formation goes back to the beginnings of modern scientific geology. The term was used by Abraham Gottlob Wer ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
