CATALOG OF ORIGINAL DESCRIPTIONS: Globorotalia youngi Fox 1954

This page provides data from the catalog of type descriptions. The catalog is sorted alphabetically. Use the current identification link to go back to the main database.


Higher levels: pf_cat -> G -> Globorotalia -> Globorotalia youngi
Other pages this level: << < G. tribulosa, G. trichotrocha, G. trinidadensis, G. troelseni, G. truncatulinoides excelsa, G. uncinata, G. uncinata carinata, G. ungulata, G. velascoensis parva, G. wartsteinensis, G. whitei, G. wilcoxensis, G. wilcoxensis acuta, G. wilesi, G. woodi, G. youngi, G. zealandica, G. zealandica incognita, G. zealandica pseudomiozea,

Globorotalia youngi

Citation: Globorotalia youngi Fox 1954
Rank: Species
Type locality: USGS locality 24090, a north-facing scarp on a southwest-flowing tributary to Crow Creek, in the SW¼ NE¼ sec. 16, T9N., R.2E., north of Belle Fourche, Butte County, South Dakota.
Type age: Upper Cretaceous, lower Coloradoan (lower Turonian)
Type sample and level: sample GUXX; upper part of the Greenhorn formation
Holotype Repository: USNM
Type & figured specimens: pl. 26, figs. 15-18
Description on pages: 119

Linked specimens: USNM-2147 USNM-106858 USNM-2149 USNM-2148 USNM-106856 USNM-106857

Current identification/main database link:


Original Description
Test small, trochoid, biconvex; chambers distinet, inflated, last three considerably enlarged, six or seven in final whorl; periphery broadly rounded; sutures strongly depressed, gently curved; umbilical area deep; aperture umbilical, at the base of the last chamber.

Size: Diameter of holotype (fig. 15) 0.20 mm.; thickness 0.1 mm. Other specimens from 0.18 to 0.2 mm. in diameter and from 0.09 to 0.1 mm. in thickness.

Extra details from original publication
Remarks. - This species is distinguished by its small size, the six or seven chambers of the last whorl, and by the greater size of the last three chambers. In general form it resembles the larger Globorotalia? multiloculata Morrow but the chambers in Morrow's species are equal in size throughout

References:

Fox, S. K. (1954). Cretaceous foraminifera from the Greenhorn, Carlile, and Cody formations, South Dakota, Wyoming. U.S. Geological Survey, Professional Paper. 254E: +119+-. gs


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Globorotalia youngi compiled by the pforams@mikrotax project team viewed: 21-9-2020

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