Helicolithus compactus


Classification: ntax_mesozoic -> Eiffellithales -> Eiffellithaceae -> Helicolithus -> Helicolithus compactus
Sister taxa: H. anceps, H. trabeculatus, H. leckiei, H. tectufissus ⟩⟨ H. turonicus, H. varolii, H. compactus, H. blairiae, H. sp.

Distinguishing features: Helicolithus with cross bars rotated slightly from the axial position.


Taxonomy:

Citation: Helicolithus compactus (Bukry, 1969) Varol & Girgis, 1994
Rank: Species
Basionym: Vagalapilla compacta Bukry, 1969
Synonyms: Staurolithites compactus
Placozygus latidecussatus Hoffmann 1970 [cf. Thierstein 1973]
Taxonomic discussion: Bukry (1969) described Vagalapilla compacta with two subspecies - V. compacta compacta and V. compacta integer. The latter is now placed in Staurolithites - as S. integer, see Burnett (1997)

Farinacci & Howe catalog pages: V. compacta compacta * , P. latidecussatus *

Distinguishing features: Helicolithus with cross bars rotated slightly from the axial position.


Morphology: Varol and Girgis (1994) applied this name to specimens >6 µm but also observed smaller specimens which they named H. cf. H. compactus; they reported Cenomanian first occurrences for both.

Search data:
TagsLITHS: murolith, elliptical, CA: cross-axial, ca_disjunct, closed, CROSS-POLARS: rim-bicyclic, V-prominent, R-prominent,
MetricsLith size: 4->7µm;
Data source notes: illustrated specimens
The morphological data given here can be used on the advanced search page. See also these notes

See also: Staurolithites integer ;

Geological Range:
Last occurrence (top): within Santonian Stage (83.64-86.26Ma, top in Santonian stage). Data source: Burnett 1998
First occurrence (base): within Early Albian Substage (110.22-112.95Ma, base in Albian stage). Data source: Kennedy et al., 2000

Plot of occurrence data:

References:

Bown, P. R. (2001). Calcareous nannofossils of the Gault, Upper Greensand and Glauconitic Marl (Middle Albian-Lower Cenomanian) from the BGS Selborne boreholes, Hampshire. Proceedings of the Geologists' Association. 112: 223-236. 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 V O

Bralower, T. J. & Bergen, J. A. (1998). Cenomanian-Santonian calcareous nannofossil biostratigraphy of a transect of cores drilled across the Western Interior Seaway. In, Dean, W. E. & Arthur, M. A. (eds) Stratigraphy and paleoenvironments of the Cretaceous Western Interior Seaway. SEPM Concepts in Sedimentology and Paleontology. -. gs

Bukry, D. (1969). Upper Cretaceous coccoliths from Texas and Europe. University of Kansas Paleontological Contributions, Articles. 51 (Protista 2): 1-79. gs V O

Burnett, J. A. (1997c). New species and new combinations of Cretaceous nannofossils and a note on the origin of Petrarhabdus (Deflandre) Wise & Wind. Journal of Nannoplankton Research. 19(2): 133-146. gs V O

Burnett, J. A. (1998). Upper Cretaceous. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 132-199. gs V O

Gale, A. S. et al. (2011). The uppermost Middle and Upper Albian succession at the Col de Palluel, Hautes-Alpes, France: An integrated study (ammonites, inoceramid bivalves, planktonic foraminifera, nannofossils, geochemistry, stable oxygen and carbon isotopes, cyclostratigraphy). Cretaceous Research. 32: 59-130. gs

Hoffmann, N. (1970a). Placozygus n. gen. (Coccolithineen) aus der Oberkreide des nordlichen Mitteleuropas. Geologie, Berlin. 19: 1004-1009. gs

Kennedy, W. J. et al. (2000). Integrated stratigraphy across the Aptian-Albian boundary in the Marnes Bleues, at the Col de Pre _-Guittard, Arnayon (Drome), and at Tartonne (Alpes-de-Haute-Provence), France: a candidate Global Boundary Stratotype Section and Boundary Point for the base of the Albian Stage. Cretaceous Research. 21: 591-720. gs

Kita, Z. A., Watkins, D. K. & Bergen, J. A. (2016). A new calcareous nannofossil species of the genus Helicolithus from the Santonian and its biostratigraphic significance in the Cretaceous Western Interior Seaway. Journal of Nannoplankton Research. 36(1): 77-82. gs V O

Püttmann, T. & Mutterlose, J. (2019). Calcareous nannofossils from a Late Cretaceous nearshore setting. Journal of Nannoplankton Research. S4: 81-88. gs V O

Püttmann, T., Mutterlose, J., Kaplan, U. & Scheer, U. (2019). Reworking of Cenomanian ammonites decoded by calcareous nannofossils (southern Münsterland Basin, northwest Germany). Neues Jahrbuch für Geologie und Paläontologie, Abhandlungen. 291(1): 1-17. gs

Thierstein, H. R. (1973). Lower cretaceous calcareous nannoplankton biostratigraphy. Abhandlungen der Geologischen Bundesanstalt. 29: 3-52. gs V O

Varol, O. & Girgis, M. (1994). New taxa and taxonomy of some Jurassic to Cretaceous calcareous nannofossils. Neues Jahrbuch für Geologie und Paläontologie, Abhandlungen. 192: 221-253. gs


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Helicolithus compactus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 6-3-2021

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