Diazomatolithus lehmanii


Classification: Mesozoic -> Watznaueriales -> Watznaueriaceae -> Diazomatolithus -> Diazomatolithus lehmanii
Sister taxa: D. galicianus, D. lehmanii, D. sp.,

Distinguishing features: Circular coccoliths with one conical/flaring shield (proximal) with elements joined along oblique sutures, and a smaller, flatter shield (distal) with the principle elements joined along near radial sutures. Moderately wide, open central area. In the LM they exhibit relatively low birefringence due to the expanded V-unit cycle, which forms the distal shield. The image flares when focussing and this species is often encountered in side view.


Taxonomy:

Citation: Diazomatolithus lehmanii Noël, 1965
Rank: Species
Variants:
Synonyms:

Farinacci & Howe catalog pages: Diazomatolithus lehmani * , Diazomatolithus subbeticus * , Umbilicosphaera germanica *

Distinguishing features: Circular coccoliths with one conical/flaring shield (proximal) with elements joined along oblique sutures, and a smaller, flatter shield (distal) with the principle elements joined along near radial sutures. Moderately wide, open central area. In the LM they exhibit relatively low birefringence due to the expanded V-unit cycle, which forms the distal shield. The image flares when focussing and this species is often encountered in side view.


Morphology remarks: The holotype of D. lehmanii was described from the Oxfordian by Noël (1965) but has not subsequently been reported from sediments of this age. It has been reported from sediments as old as Tithonian, e.g., from the Iberia Abyssal Plain (de Kaenel and Bergen, 1996), however, these specimens have wider central areas and less steeply tapered proximal shields.

Geological Range:
Notes: Last occurrence is recorded in the Barremian in the Boreal area (Bown et al., 1998).
Last occurrence (top): within Early Aptian Substage (122.98-126.30Ma, top in Aptian stage). Data source: [PRB rough estimate]
First occurrence (base): within Tithonian Stage (145.01-152.06Ma, base in Tithonian stage). Data source: Bown et al. 1998

Plot of occurrence data:

  • Histogram - Neptune occurrence data from DSDP and ODP proceedings. Pale shading <50 samples in time bin. Interpret with caution & read these notes
  • Note to users in China - the diagram may not plot unless you use a VPN since I use google services on the website. If this is a problem please contact me 谢谢.
  • Taxon plotted: Diazomatolithus lehmanii, synonyms included - Diazomatolithus lehmanii;
  • space-time plot :: Samples map :: Parent: Diazomatolithus

    References:

    Applegate, J. L. & Bergen, J. A. (1988). Cretaceous calcareous nannofossil biostratigraphy of sediments recovered from the Galicia Margin, ODP Leg 103. Proceedings of the Ocean Drilling Program. Scientific Results. 103: 293-348. gs

    Barnard, T. & Hay, W. W. (1974). On Jurassic coccoliths: A tentative zonation of the Jurassic of Southern England and North France. Eclogae Geologicae Helvetiae. 67(3): 563-585. gs

    Bown, P. R. & Concheyro, A. (2004). Lower Cretaceous calcareous nannoplankton from the Neuquen Basin, Argentina. Marine Micropaleontology. 52(1-4): 51-84. gs

    Bown, P. R. & Cooper, M. K. E. (1998). Jurassic. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 34-85. gs

    Bown, P. R. (2005c). Early to Mid-Cretaceous Calcareous Nannoplankton from the Northwest Pacific Ocean, Leg 198, Shatsky Rise. Proceedings of the Ocean Drilling Program. Scientific Results. 198: 1-82. gs

    Bown, P. R., Rutledge, D. C., Crux, J. A. & Gallagher, L. T. (1998). Early Cretaceous. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 86-131. gs

    Covington, J. M. & Wise, S. W. (1987). Calcareous nannofossil biostratigraphy of a Lower Cretaceous deep-sea fan complex: Deep Sea Drilling Project Leg 93 Site 603, lower continental rise off Cape Hatteras. Initial Reports of the Deep Sea Drilling Project. 93: 617-660. gs

    de Kaenel, E. & Bergen, J. A. (1996). Mesozoic calcareous nannofossil biostratigraphy from sites 897, 899, and 901, Iberia Abyssal Plain: New biostratigraphic evidence. Proceedings of the Ocean Drilling Program. Scientific Results. 149: 27-59. gs

    Grün, W. & Allemann, F. (1975). The Lower Cretaceous of Caravaca (Spain): Berriasian Calcareous Nannoplankton of the Miravetes Section (Subbetic Zone, Prov. of Murcia). Eclogae Geologicae Helvetiae. 68: 147-211. gs

    Medd, A. W. (1979). The Upper Jurassic coccoliths from the Haddenham and Gamlingay boreholes (Cambridgeshire, England). Eclogae Geologicae Helvetiae. 72: 19-109. gs

    Mutterlose, J. & Wise, S. W. (1990). Lower Cretaceous nannofossil biostratigraphy of ODP Leg 113 Holes 692B and 693A, continental slope off east Antarctica, Weddell Sea. Proceedings of the Ocean Drilling Program. Scientific Results. 113: 325-351. gs

    Noël, D. (1965). Sur les Coccolithes du Jurassique Européen et d'Afrique du Nord. Éditions du Centre National de la Recherche Scientifique, Paris. -. gs

    Wind, F. H. & Cepek, P. (1979). Lower Cretaceous calcareous nannoplankton from DSDP Hole 397A (northwest African Margin). Initial Reports of the Deep Sea Drilling Project. 47A: 221-235. gs


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    Diazomatolithus lehmanii compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 9-12-2019

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