Revision of thelodonts, acanthodians, conodonts, and the depositional environments in the Burgen outlier (Ludlow, Silurian) of Gotland, Sweden

Jarochowska E, Bremer O, Yiu A, Märss T, Blom H, Mörs T, Vajda V (2021)

Publication Language: English

Publication Type: Journal article, Original article

Publication year: 2021

Journal

GFF Taylor & Francis

DOI: 10.1080/11035897.2021.1907441

Abstract

Ludfordian strata exposed in the Burgen outlier in eastern Gotland record a time of initial faunal recovery after a global environmental perturbation manifested in the Ludfordian Carbon Isotope Excursion (LCIE). Vertebrate microfossils in the collection of the late Lennart Jeppsson, hosted at the Swedish Museum of Natural History, hold the key to reconstruct the dynamics of faunal immigration and diversification during the decline of the LCIE, but the stratigraphic relationships of the strata have been debated. Historically, they had been placed in the Burgsvik Formation, which included the Burgsvik Sandstone and the Burgsvik Oolite members. We revise the fauna in the Jeppsson collection and characterize key outcrops of Burgen and Kapellet. The former Burgsvik Oolite Member is here revised as the Burgen Oolite Formation. In the Burgen outlier, back-shoal facies of this formation are represented and their position in the Ozarkodina snajdri Biozone is supported. The shallow-marine position compared to the  coeval strata in southern Gotland is reflected in the higher δ13Ccarb values, reaching +9.2‰. The back-shoal succession includes high-diversity metazoan reefs, which indicate a complete recovery of the carbonate producers as the LCIE declined. The impoverishment of conodonts associated with the LCIE in southern Gotland might be a product of facies preferences, as the diverse environments in the outlier yielded all 21 species known from the formation. Fish diversity also returned to normal levels as the LCIE declined, with a minimum of nine species. In line with previous reports, thelodont scales appear to dominate samples from the Burgen outlier.

Authors with CRIS profile

Emilia Jarochowska Naturwissenschaftliche Fakultät

Involved external institutions

Swedish Museum of Natural History SE Sweden (SE) Uppsala University SE Sweden (SE) Tallinn University of Technology EE Estonia (EE)

How to cite

APA:

Jarochowska, E., Bremer, O., Yiu, A., Märss, T., Blom, H., Mörs, T., & Vajda, V. (2021). Revision of thelodonts, acanthodians, conodonts, and the depositional environments in the Burgen outlier (Ludlow, Silurian) of Gotland, Sweden. GFF. https://doi.org/10.1080/11035897.2021.1907441

MLA:

Jarochowska, Emilia, et al. "Revision of thelodonts, acanthodians, conodonts, and the depositional environments in the Burgen outlier (Ludlow, Silurian) of Gotland, Sweden." GFF (2021).

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