Catalog - Globotruncana inornata Catalog - Globotruncana inornata

CATALOG OF ORIGINAL DESCRIPTIONS: Globotruncana inornata Bolli 1957

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 -> Globotruncana -> Globotruncana inornata
Other pages this level: << < G. fresnoensis, G. fundiconulosa, G. gagnebini, G. gansseri, G. gansseri gandolfii, G. gansseri subgansseri, G. globigerinoides, G. goudkoffi, G. hanzawai, G. havanensis, G. helvetica, G. helvetica posthelvetica, G. hilli, G. imbricata, G. indica, G. inornata, G. intermedia, G. intermedia difformis, G. japonica, G. japonica robusta, G. kuepperi, G. lakrai, G. lamellosa, G. lapparenti, G. lapparenti coronata, G. lapparenti depressa, G. lapparenti inflata, G. lapparenti longilocula, G. leupoldi, G. linnei angusticarenata, G. linnei bulloides> >>

Globotruncana inornata

Citation: Globotruncana inornata Bolli 1957
taxonomic rank: Species
Type specimens: 4800
Type sample (& lithostrat): lower part of the Naparima Hill Formation,
Type age (chronostrat): Coniacian, Globotruncana renzi zone
Type locality: Types and occurrence: Figured types from Trinidad Petroleum Development well Moruga 15, Trinidad (coordinates N:149878 Hnks, E:497002 links). Holotype (USNM P4800) from core 6,802-6,827 feet (TLL 223498), paratype (USNM P4801) from core 6,980-7,005 feet (TLL 223504).
Type repository: Washington; USNM

Linked specimens: USNM-4801 USNM-4800

Current identification/main database link: Whiteinella inornata (Bolli, 1957)


Original Description

Shape of test low trochospiral, biconvex; the equatorial periphery strongly lobate, early chambers of last whorl rounded at periphery, last and occasionally penultimate chambers compressed with sharp peripheral edge or faint keel. Wall calcareous, perforate surface of early chambers in well-preserved specimens showing some rugosity. Chambers subangular, compressed; fourteen to sixteen, arranged in three whorls; the four chambers of the last whorl increase rapidly in size, early whorls small by comparison. Sutures of spiral side slightly curved, depressed, of umbilcal side straight, depressed. Umbilical shallow, wide. Primary apertures interiomarginal, umbilical; tegilla with accessory apertures poorly preserved in examined specimens. The coiling predominantly dextral; of fifty specimens counted, only four coiled sinistrally. 


Size:
Dimensions of holotype: diameter 0.44 mm.; thickness 0.2 mm.

Extra details from original publication
Range: Globotruncana inornata zone to Globotruncana concavata zone, Naparima Hill formation. Holotype from Globotruncana renzi zone, Naparima Hill formation. Similar forms seem to extend into the Globotruncana fornicata and G. stuarti zones of the Naparima Hill 
formation.
Remarks: Globotruncana inornatata, new species, differs from Globotruncana wilsoni, new species, in having the early chambers of the last whorl roimded at the periphery rather than with a double keel. It also has a longer stratigraphic range than Globotruncana wilsoni,
new species.

References:

Bolli, H. M. (1957e). The genera Praeglobotruncana, Rotalipora, Globotruncana, and Abathomphalus in the Upper Cretaceous of Trinidad, B. W. I. In, Loeblich, A. R. , Jr., Tappan, H., Beckmann, J. P., Bolli, H. M., Montanaro Gallitelli, E. & Troelsen, J. C. (eds) Studies in Foraminifera. U.S. National Museum Bulletin . 215: 51-60. gs

Bolli, H. M. (1957c). The foraminiferal genus Schackoina Thalmann, emended, and Leupoldina, n. gen. in the Cretaceous of Trinidad, B. W. I. Eclogae Geologicae Helvetiae. 50(2): 271-278. gs


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Globotruncana inornata compiled by the pforams@mikrotax project team viewed: 20-6-2024

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