The growth spiral in some planktonic foraminifera from the Eocene of Denmark

Arne Dinesen

doi:10.22008/gpub/38243

The growth spiral in some planktonic foraminifera from the Eocene of Denmark

Arne Dinesen

Research output: Chapter in Book/Report/Conference proceeding › Chapter in book › Research

Abstract

The indi vidual growth pattern of the planktonic foraminifera Globigerinatheka index (Finlay) is extremely variable, and the taxonomical problems involved are very complex. The different morphotypes displayed by some Danish material of G. index are presented in this paper.

The growth spiral is analysed and compared with the spiral of other taxa referred to as Globigerina sp., Globigerina ex gr. bulloides d'Orbigny , and Globigerina patagonica Todd & Kniker. The appearance of the ultimate chamber is illustrated by graphs of its dimensions, absolutely and relatively. In many specimens the ultimate chamber is displaced from the 'normal' growth spiral. The growth lines representing length versus Breadth of the 'normal' growth spiral are constructed and statistically tested.

Original language	English
Title of host publication	DGU Årbog 1974
Publisher	DGU
Pages	105-138
Number of pages	34
Volume	1974
DOIs	https://doi.org/10.22008/gpub/38243
Publication status	Published - 18 Sept 1975

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Series	DGU Årbog
Volume	1974

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Programme Area 1: Data

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title = "The growth spiral in some planktonic foraminifera from the Eocene of Denmark",

abstract = "The indi vidual growth pattern of the planktonic foraminifera Globigerinatheka index (Finlay) is extremely variable, and the taxonomical problems involved are very complex. The different morphotypes displayed by some Danish material of G. index are presented in this paper. The growth spiral is analysed and compared with the spiral of other taxa referred to as Globigerina sp., Globigerina ex gr. bulloides d'Orbigny , and Globigerina patagonica Todd \& Kniker. The appearance of the ultimate chamber is illustrated by graphs of its dimensions, absolutely and relatively. In many specimens the ultimate chamber is displaced from the 'normal' growth spiral. The growth lines representing length versus Breadth of the 'normal' growth spiral are constructed and statistically tested.",

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AB - The indi vidual growth pattern of the planktonic foraminifera Globigerinatheka index (Finlay) is extremely variable, and the taxonomical problems involved are very complex. The different morphotypes displayed by some Danish material of G. index are presented in this paper. The growth spiral is analysed and compared with the spiral of other taxa referred to as Globigerina sp., Globigerina ex gr. bulloides d'Orbigny , and Globigerina patagonica Todd & Kniker. The appearance of the ultimate chamber is illustrated by graphs of its dimensions, absolutely and relatively. In many specimens the ultimate chamber is displaced from the 'normal' growth spiral. The growth lines representing length versus Breadth of the 'normal' growth spiral are constructed and statistically tested.

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DO - 10.22008/gpub/38243

M3 - Chapter in book

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SP - 105

EP - 138

BT - DGU Årbog 1974

PB - DGU

ER -

The growth spiral in some planktonic foraminifera from the Eocene of Denmark

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