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Chitinozoans from the upper Tremadocian (Lower Ordovician) Watch Hill Formation of the Lake District, northern England

(2017) PALYNOLOGY. 41(suppl. 1). p.23-30
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Abstract
The Global Stratotype Section and Point (GSSP) for the Lower Ordovician Floian Stage is defined by the first appearance datum (FAD) of the graptolite Tetragraptus approximatus at Diabasbrottet Quarry, Hunneberg, southern Sweden. Correlation of sections with the Floian GSSP when graptolites are absent, however, must rely on other criteria. Among other fossil groups with potential for biostratigraphical correlation at this level are chitinozoans. Here we describe a chitinozoan assemblage from the Watch Hill Formation in the Skiddaw Group of northern England. The Watch Hill Formation is dated on graptolite evidence as late Tremadocian, but the assemblage contains Euconochitina symmetrica, a species previously considered to indicate the eponymous lowermost Arenig (Floian) chitinozoan biozone in a long-established Gondwanan Ordovician biozonal scheme. The hitherto earliest Floian index species has also been reported recently from Tremadocian successions in South China and Morocco. We here confirm its extended range into the Tremadocian and its continued significance as an index species for the Tremadocian–Floian boundary interval.
Keywords
chitinozoans, Tremadocian, Floian, Early Ordovician, biostratigraphy, HISTORICAL TYPE AREA, WALES, BIOSTRATIGRAPHY, BIODIVERSIFICATION, STRATIGRAPHY, AVALONIA, SECTION, ARENIG, SERIES, CHINA

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Chicago
Amberg, Chloé EA, Thijs Vandenbroucke, Stewart G Molyneux, and Thomas Servais. 2017. “Chitinozoans from the Upper Tremadocian (Lower Ordovician) Watch Hill Formation of the Lake District, Northern England.” Palynology 41 (suppl. 1): 23–30.
APA
Amberg, Chloé EA, Vandenbroucke, T., Molyneux, S. G., & Servais, T. (2017). Chitinozoans from the upper Tremadocian (Lower Ordovician) Watch Hill Formation of the Lake District, northern England. PALYNOLOGY, 41(suppl. 1), 23–30.
Vancouver
1.
Amberg CE, Vandenbroucke T, Molyneux SG, Servais T. Chitinozoans from the upper Tremadocian (Lower Ordovician) Watch Hill Formation of the Lake District, northern England. PALYNOLOGY. 2017;41(suppl. 1):23–30.
MLA
Amberg, Chloé EA et al. “Chitinozoans from the Upper Tremadocian (Lower Ordovician) Watch Hill Formation of the Lake District, Northern England.” PALYNOLOGY 41.suppl. 1 (2017): 23–30. Print.
@article{8564527,
  abstract     = {The Global Stratotype Section and Point (GSSP) for the Lower Ordovician Floian Stage is defined by the first appearance datum (FAD) of the graptolite Tetragraptus approximatus at Diabasbrottet Quarry, Hunneberg, southern Sweden. Correlation of sections with the Floian GSSP when graptolites are absent, however, must rely on other criteria. Among other fossil groups with potential for biostratigraphical correlation at this level are chitinozoans. Here we describe a chitinozoan assemblage from the Watch Hill Formation in the Skiddaw Group of northern England. The Watch Hill Formation is dated on graptolite evidence as late Tremadocian, but the assemblage contains Euconochitina symmetrica, a species previously considered to indicate the eponymous lowermost Arenig (Floian) chitinozoan biozone in a long-established Gondwanan Ordovician biozonal scheme. The hitherto earliest Floian index species has also been reported recently from Tremadocian successions in South China and Morocco. We here confirm its extended range into the Tremadocian and its continued significance as an index species for the Tremadocian--Floian boundary interval.},
  author       = {Amberg, Chlo{\'e} EA and Vandenbroucke, Thijs and Molyneux, Stewart G and Servais, Thomas},
  issn         = {0191-6122},
  journal      = {PALYNOLOGY},
  language     = {eng},
  number       = {suppl. 1},
  pages        = {23--30},
  title        = {Chitinozoans from the upper Tremadocian (Lower Ordovician) Watch Hill Formation of the Lake District, northern England},
  url          = {http://dx.doi.org/10.1080/01916122.2017.1348721},
  volume       = {41},
  year         = {2017},
}

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