Abstract
Abstract The quarry at Orreholmen, Billingen‐Falbygden District, Province of Västergötland, in south‐central Sweden was sampled for conodonts. The local stratigraphy, which is complicated, has previously been determined on the basis of macrofossils. Upper Cambrian and lower Tremadocian bituminuous shales with stinkstone lenses are overlain by glauconitic deposits grading into “orthoceratite limestone” of Arenigian age. The results reported here of conodont investigations from various levels throughout the sequence demonstrate the absence of certain levels in the Lower Tremadoc and the lower Upper Tremadoc, possibly of a part of the basal Arenig and of a level at the Latorp‐Lanna Stage boundary (lower middle Arenig). Comparison of data from Orreholmen with observations from sections in other parts of Baltoscandia, information on evolutionary lineages of conodonts and evidence from redeposited conodont elements were combined to produce reconstructed stratigraphie sequences. Particularly important for these results was the analysis of the reworked faunal components, which are unusually common at this locality. For the first time the presence of conodonts from basal Tremadoc beds has been proved in Sweden. The Ordovician part of the sections includes (in terms of conodont biostratigraphy) strata from the Cordylodus lindstromi Zone to near the top of the Paroistodus originales Zone. Löfgren, A., 1996: Lower Ordovician conodonts, reworking and biostratigraphy of the Orreholmen quarry, Västergötland, south‐central Sweden. GFF, Vol. 118 (Pt. 3, September), pp. 169–183. Stockholm. ISSN 1103–5897.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.