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We want to thank Dr. Jochen Erbacher, two anonymous reviewers and Dr. Sietske Batenburg for their careful and valuable comments on the manuscript. This work was supported by the Spanish research projects CGL2008-03112/BTE, CGL2011-25894 and a UCM research fellowship.

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Fraguas, AngelaCorresponding Author

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October 18, 2022
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Calcareous nannofossil biostratigraphy of the Lower Jurassic in the Cantabrian Range (Northern Spain)

Publicated to:Newsletters On Stratigraphy. 48 (2): 179-199 - 2015-01-01 48(2), DOI: 10.1127/nos/2015/0059

Authors: Fraguas, Angela; Jose Comas-Rengifo, Maria; Perilli, Nicola

Affiliations

Goethe Univ Frankfurt, Inst Geosci, D-60438 Frankfurt, Germany - Author
UCM, Fac Ciencias Geol, Dept Paleontol, Madrid 28040, Spain - Author
Univ Pisa, Dipartamento Sci Terra, I-56100 Pisa, Italy - Author

Abstract

This paper provides a synthesis of the Upper Sinemurian-Lower Toarcian (Lower Jurassic) calcareous nannofossil biostratigraphy for the Cantabrian Range (Northern Spain), based on four sections from the Basque Cantabrian Basin and one section from Asturias. Data derive from previously published biostratigraphic schemes and unpublished data, based on results obtained from semi-quantitative analysis of more than 485 calcareous nannofossil assemblages. Calcareous nannofossil main and secondary events are calibrated to the ammonite zonations established for the studied areas. We propose 5 main events: the first occurrences (FOs) of Similiscutum cruciulus, Biscutum novum, Lotharingius hauffii, Lotharingius sigillatus and Carinolithus superbus, based on continuously recorded and common taxa, and 5 secondary events: the FOs of Biscutum grande, Biscutum finchii and Lotharingius barozii and the first common occurrences (FCOs) of Calcivascularis jansae and L. hauffii, on the basis of rare taxa with a discontinuous record. A new biostratigraphic scheme, consisting of 4 calcareous nannofossil Zones (CNZs; NJ3 Crepidolithus crassus, NJ4 Similiscutum cruciulus, NJ5 Lotharingius hauffii and NJ6 Carinolithus superbus), two new calcareous nannofossil Subzones (CNSzs; NJ4a Crepidolithus cantabriensis and NJ4b Biscutum novum) and one emended CNSz (NJ5a Biscutum finchii), is proposed here for the Lower Jurassic of the Cantabrian Range. The new biostratigraphic scheme is compared to schemes from NW Europe, Portugal and Italy/S France. The FOs of S. cruciulus and C. superbus are reproducible in all the compared areas. However, the FOs of L. hauffii and L. sigillatus seem to be diachronous events in the Boreal and Tethyan Realms, probably due to the absence of a refined and precise ammonite zonation, to differential preservation or to provincialism of the ammonite faunas. It is possible that the FO of L. hauffii recognized in Portugal and Italy/S France within the Spinatum ammonite Zone (AZ) could be correlated with the FCO of L. hauffii identified in Cantabrian Basin. Probably the Lotharingius species firstly appeared in the Boreal Realm, and later spread into the Tethyan Realm. This study confirms the potential of calcareous nannofossil biostratigraphy for dating Lower Jurassic sections and intra- and for inter-regional correlation.

Keywords

Anoxic eventAsturiasBasinBiohorizonsBiostratigraphyCalcareous nannofossilsCan-tabrian rangeCantabrian rangeCretaceous boundaryEvolutionIntervalLower jurassicMass extinctionMiddlePliensbachian-early toarcianSectionsZonal scheme

Quality index

Bibliometric impact. Analysis of the contribution and dissemination channel

The work has been published in the journal Newsletters On Stratigraphy due to its progression and the good impact it has achieved in recent years, according to the agency WoS (JCR), it has become a reference in its field. In the year of publication of the work, 2015, it was in position 11/47, thus managing to position itself as a Q1 (Primer Cuartil), in the category Geology.

From a relative perspective, and based on the normalized impact indicator calculated from World Citations provided by WoS (ESI, Clarivate), it yields a value for the citation normalization relative to the expected citation rate of: 1.19. This indicates that, compared to works in the same discipline and in the same year of publication, it ranks as a work cited above average. (source consulted: ESI Nov 14, 2024)

This information is reinforced by other indicators of the same type, which, although dynamic over time and dependent on the set of average global citations at the time of their calculation, consistently position the work at some point among the top 50% most cited in its field:

  • Field Citation Ratio (FCR) from Dimensions: 2.73 (source consulted: Dimensions Jul 2025)

Specifically, and according to different indexing agencies, this work has accumulated citations as of 2025-07-18, the following number of citations:

  • WoS: 26
  • Scopus: 24

Impact and social visibility

From the perspective of influence or social adoption, and based on metrics associated with mentions and interactions provided by agencies specializing in calculating the so-called "Alternative or Social Metrics," we can highlight as of 2025-07-18:

  • The use of this contribution in bookmarks, code forks, additions to favorite lists for recurrent reading, as well as general views, indicates that someone is using the publication as a basis for their current work. This may be a notable indicator of future more formal and academic citations. This claim is supported by the result of the "Capture" indicator, which yields a total of: 7 (PlumX).

Leadership analysis of institutional authors

This work has been carried out with international collaboration, specifically with researchers from: Germany; Italy.

There is a significant leadership presence as some of the institution’s authors appear as the first or last signer, detailed as follows: First Author (Fraguas Herráez, Ángela Raquel) .

the author responsible for correspondence tasks has been Fraguas Herráez, Ángela Raquel.