Chiastozygus spissus

Bergen in Bralower & Bergen, 1998 Jan 26, 2026

Set number: 2923

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10µm

Chiastozygus spissus, Late Cenomanian, Vergons, SE France

Set number: 2922

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10µm

Chiastozygus spissus, Early Cenomanian, Vergons, SE France

Set number: 2921

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10µm

Chiastozygus spissus, Early Cenomanian, Vergons, SE France

Final Epithet

Chiastozygus spissus Bergen in Bralower & Bergen, 1998

Basionym

Chiastozygus spissus Bergen in Bralower & Bergen, 1998

Optical Properties

In plan view under crossed polars, the entire structure, including the double wall and the diagonal cross, displays whitish‑grey interference colours.

Remarks

Species of Chiastozygus are characterised by a double wall and a central area that is almost entirely occupied by a diagonal cross whose arms are divided into two halves.

References

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. 59–77.

Taxonomy

Chiastozygus

Biostratigraphy

Stratigraphic Range

Late Albian - Late Turonian

Age (Ma)

107.59? - 89.39?

Holotype

Chiastozygus spissus Bergen in Bralower & Bergen, 1998,

Late Albian

Blieux, SE France