A crustoid graptolite lithoimmured inside a Middle Ordovician nautiloid conch from northern Estonia

• Autorzy: Vinn Olev , Wilson Mark A. , Toom Ursula

Identyfikatory

DOI

10.14241/asgp.2019.17

• Języki publikacji: EN

Abstrakty

EN

A light grey nautiloid conch has a dark brown colony attached to its internal surface. This colonial fossil resembles hederellids and bryozoans, but is in fact a crustoid graptolite (Hormograptus? sp.). The colony has been lithoimmured inside this nautiloid conch by early cementation. Crustoid graptolites were a part of the encrusting communities in the Middle Ordovician of Baltica, but their abundance among encrusters of biogenic substrates reached a peak in the middle Sandbian. The cryptic mode of life appeared very early in the evolution of the crus- toids. The discovery of this crustoid graptolite in a nautiloid conch indicates that the Baltic Middle Ordovician cryptic communities were taxonomically more diverse than was known previously. The nautiloid conch studied is sparsely encrusted with an encrustation density that is similar to those of other Middle Ordovician cryptic surfaces described from Estonia.

Słowa kluczowe

EN

Encrustation; graptolites; nautiloids; cryptic fauna; Darriwilian; Baltica

• Wydawca: Polskie Towarzystwo Geologiczne
• Czasopismo: Annales Societatis Geologorum Poloniae
• Rocznik: 2019
• Tom: Vol. 89, No. 3
• Strony: 285--290
• Opis fizyczny: Bibliogr. 39 poz., rys.

Twórcy

autor

Vinn Olev

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

autor

Wilson Mark A.

• Department of Earth Sciences, The College of Wooster, Wooster, OH44691, USA

autor

Toom Ursula

• Department of Geology, Tallinn University of Technology, Ehitajate tee 5, 19086 Tallinn, Estonia

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Uwagi

Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2020).