Alleged cnidarian Sphenothallus in the Late Ordovician of Baltica, its mineral composition and microstructure

• Autorzy: Vinn O. , Kirsimae K.
• Języki publikacji: EN

Abstrakty

EN

Sphenothallus is a problematic fossil with possible cnidarian affinities. Two species of Sphenothallus, S. aff. longissimus and S. kukersianus, occur in the normal marine sediments of the Late Ordovician of Estonia. S. longissimus is more common than S. kukersianus and has a range from early Sandbian to middle Katian. Sphenothallus had a wide paleo-biogeographic distribution in the Late Ordovician. The tubes of Sphenothallus are composed of lamellae with a homogeneous microstructure. The homogeneous microstructure could represent a diagenetic fabric, based on the similarity to diagenetic structures in Torellella (Cnidaria?, Hyolithelminthes). Tubes of Sphenothallus have an apatitic composition, but one tube contains lamellae of diagenetic calcite within the apatitic structure. Sphenothallus presumably had originally biomineralized apatitic tubes. Different lattice parameters of the apatite indicate that biomineralization systems of phosphatic cnidarians Sphenothallus and Conularia sp. may have been different.

Słowa kluczowe

EN

alleged cnidarian; cnidarian; Sphenothallus; Late Ordovician; Ordovician; Sandbian; Katian; mineral composition; microstructure; Estonia

• Wydawca: -
• Czasopismo: Acta Palaeontologica Polonica
• Rocznik: 2015
• Tom: 60
• Numer: 4
• Opis fizyczny: p.1001-1008,fig.,ref.

Twórcy

autor

Vinn O.

• Department of Geology, University of Tartu, Ravila 14A, 50411 Tartu, Estonia

autor

Kirsimae K.

• Department of Geology, University of Tartu, Ravila 14A, 50411 Tartu, Estonia

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