Chapter 14 Rex Chert member of the permian phosphoria formation: Composition, with emphasis on elements of environmental concern

Hein, James R.; McIntyre, Brandie R.; Perkins, Robert B.; Piper, David Z.; Evans, Jonathan

doi:10.1016/s1874-2734(04)80016-0

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“…Kametaka et al. (2005) discussed similarities in age, lithology and geochemistry between the Gufeng Formation and the Phosphoria Formation in northwestern USA, the latter of which consists of phosphorite‐bearing mudstone and black spiculitic chert (Hein et al. 2004).…”

Section: Discussionmentioning

confidence: 99%

“…Kametaka et al (2005) concluded that the Gufeng Formation was deposited on the outer shelf of the Yangtze platform in the eastern Paleotethys. Kametaka et al (2005) discussed similarities in age, lithology and geochemistry between the Gufeng Formation and the Phosphoria Formation in northwestern USA, the latter of which consists of phosphorite-bearing mudstone and black spiculitic chert (Hein et al 2004).…”

Section: Suggestion For Facies: Sedimentary Environmentsmentioning

confidence: 99%

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Middle Permian radiolarians from Anmenkou, Chaohu, Northeastern Yangtze platform, China

et al. 2009

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The biostratigraphy of the Middle Permian Gufeng Formation in the northeastern Yangtze platform is examined based on radiolarians. This study is concentrated on the Anmenkou section in the Chaohu area of Anhui Province, China. The Gufeng Formation is divided into the Phosphate Nodule‐bearing Mudstone Member (PNMM) and the Siliceous Rock Member (SRM) in ascending order. The former primarily consists of mudstone including abundant phosphate nodules, and the latter consists mainly of alternating beds of chert, siliceous mudstone and mudstone, with intercalations of porous chert. Ammonoids in the mudstone of the lower PNMM are Wordian. Chert, siliceous mudstone and mudstone of the SRM include abundant radiolarians with sponge spicule assemblages suggestive of the Wordian–Capitanian. Albaillellaria are predominant in the lower SRM, while Entactinaria and Spumellaria are predominant in the middle and upper SRM. These radiolarians correspond to three radiolarian assemblage zones: Pseudoalbaillella longtanensis–Pseudoalbaillella fusiformis, Follicucullus monacanthus, and Follicucullus scholasticus–Ruzhencevispongus uralicus. The assemblage of radiolarians and sponge spicule fauna suggests a depositional depth of 150–500 m. The radiolarian fauna of the Gufeng Formation is considered to be representative of the relatively shallow, tropical radiolarian fauna of the Middle Permian eastern Paleotethys.

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Section: Discussionmentioning

confidence: 99%