Zygodiscus herlyni

Set number: 1957

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10µm

Zygodiscus herlyni, Late Paleocene, IODP Leg 171, Site 1051A, Black Nose, Western North Atlantic

In the mobile mount

Set number: 1955

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10µm

Zygodiscus herlyni, Late Paleocene, Santos Basin, Brazil

Set number: 1956

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10µm

Zygodiscus herlyni, Late Paleocene, DSDP Leg 25, Site 245, Mozambique Channel (Davie Ridge), Indian Ocean

Final Epithet

Zygodiscus herlyni Sullivan, 1964

Basionym

Zygodiscus herlynii Sullivan, 1964

Remarks

A species of Zygodiscus characterised by a transverse bar made up of two halves, each formed by two segments. The narrow outer wall remains in constant extinction, while the inner wall exhibits first-order white interference colours, with dextrogyre inclined extinction lines and length-fast (−) elongation on the distal side. The transverse bar displays length-slow (+) elongation on the distal side.

References

Sullivan, F. R., 1964. Lower Tertiary nannoplankton from the California Coast Ranges. I. Paleocene. University of California Publications in Geological Sciences 44, 163-227.

Taxonomy

Zygodiscus

Biostratigraphy

Stratigraphic Range

Thanetian

Zone(s)

NP7 - NP8

Age (Ma)

59.24? - 56.00

Holotype

Zygodiscus herlyni Sullivan, 1964

Late Paleocene

Anita Shale, Santa Barbara County, California, USA