Bifidalithus geminicatillus

Varol, 1991 Jan 13, 2026

Set number: 2749

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Bifidalithus geminicatillus, Early Coniacian, Onshore Texas, USA

Set number: 2748

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10µm

Bifidalithus geminicatillus, Early Coniacian, Onshore Texas, USA

Set number: 2747

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Bifidalithus geminicatillus, Early Coniacian, Onshore Texas, USA

Set number: 2746

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Bifidalithus geminicatillus, Early Coniacian, Onshore Texas, USA

Set number: 2745

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Bifidalithus geminicatillus, Early Turonian, Onshore Texas, USA

Set number: 2744

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Bifidalithus geminicatillus, Early Turonian, Onshore Texas, USA

Set number: 2743

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Bifidalithus geminicatillus, Early Turonian, Onshore Texas, USA

Final Epithet

Bifidalithus geminicatillus Varol, 1991

Basionym

Bifidalithus geminicatillus Varol, 1991

Optical Properties

The crystalline blocks are in constans extinction, whereas the wall displays a greyish-white interference colour.

Remarks

Species of Bifidalithus are characterised by two square, imperforate crystalline blocks separated by an often zig-zag–shaped suture along the short axis, supporting a distal process and surrounded by a narrow wall.

References

Varol, O. 1991. New Cretaceous and Tertiary Calcareous Nannofossils. Neues Jahrbuch für Geologie und Paläontologie Abhandlungen 182: 211-237.

Taxonomy

Bifidalithus

Bifidalithus geminicatillus

Biostratigraphy

Stratigraphic Range

Early Turonian - Middle Campanian

Age (Ma)

93.90? - 77.56

Holotype

Bifidalithus geminicatillus Varol, 1991

Campanian

Norwegian sector, North Sea area