PBDB Collection

New Madrid test well 1-X, 1686.5 ft (Paleocene of the United States)

Where: New Madrid County, Missouri (36.4° N, 89.6° W: paleocoordinates 39.5° N, 69.8° W)

• coordinate estimated from map

• hand sample-level geographic resolution

When: Porters Creek Formation, Paleocene (66.0 - 56.0 Ma)

Environment/lithology: marginal marine; hardground, micaceous, pyritic, gray claystone

• Steel-gray to dark-gray, hard, micaceous clay; disseminated organic material common; locally mottled yellow-buff; conchoidal fracture; locally fossiliferous; pyrite common.

Size class: microfossils

Preservation: original calcite, original silica

Reposited in the USGS

Collection methods: core,

Primary reference: N. O. Frederiksen, L. M. Bybell, R. A. Christopher, A. J. Crone, L. E. Edwards, T. G. Gibson, J. E. Hazel, J. E. Repetski, D. P. Russ, C. C. Smith, and L.W. Ward. 1982. Biostratigraphy and paleoecology of lower Paleozoic, upper Cretaceous, and lower Tertiary rocks in U.S. Geological Survey New Madrid test wells, Southeastern Missouri. Tulane Studies in Geology and Paleontology 17(2):23-45 [P. Jardine/H. Morck]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 232027: authorized by Phillip Jardine, entered by Hannah Morck on 11.10.2023

Creative Commons license: CC BY (attribution)

Taxonomic list

• Calcareous nannofossils are also present in this sample, but are listed in collection 231964.

Show authors, comments, and common names

unclassified
-	Haplocytheridae fornicata, Valvulinaria sp. Haplocytheridae fornicata Valvulinaria sp.
Ostracoda
Platycopida - Cytherellidae	Cytherella tumidosa Cytherella tumidosa Alexander 1934 ostracod
Podocopida - Loxoconchidae	Loxoconcha cf. perdecora Loxoconcha cf. perdecora Alexander 1934 ostracod
Podocopida - Trachyleberididae	Brachycythere plena, "Cythereis" cancellosa, Hazelina "n. sp. A", Acanthocythereis sp., Phacorhabdotus sculptilis Brachycythere plena Alexander 1934 ostracod "Cythereis" cancellosa Alexander 1934 ostracod Hazelina "n. sp. A" Moos 1966 ostracod Repandocosta sp. A of Hazel, 1967 Acanthocythereis sp. ostracod Phacorhabdotus sculptilis ostracod
Podocopida - Xestoleberididae	Xestoleberis truncata Xestoleberis truncata Alexander 1934 ostracod
Podocopida - Hemicytheridae	Hermanites gibsoni Hermanites gibsoni ostracod
Foraminifera
-	Pseudoglandulina pygmaea, Marginulina cf. glabra Pseudoglandulina pygmaea Marginulina cf. glabra d'Orbigny 1826
Nodosariata
Nodosariida - Nodosariidae	Vaginulina gracilis, Nodosaria affinis, Robulus cf. rosettus, Robulus midwayensis, Dentalina colei Vaginulina gracilis Nodosaria affinis Reuss 1845 Robulus cf. rosettus Robulus midwayensis Plummer 1926 Dentalina colei Cushman and Dusenbury 1934
Polymorphinida - Ellipsoidinidae	Ellipsonodosaria sp. Ellipsonodosaria sp. Silvestri 1900
Polymorphinida - Polymorphinidae	Globulina gibba, Guttulina problema Globulina gibba d'Orbigny 1832 Guttulina problema d'Orbigny 1826
Globothalamea
Rotaliida - Cibicididae	Cibicides praecursorius, Cibicides "sp. A", Cibicides "sp. B", Cibicides cf. neelyi, Cibicides alleni Cibicides praecursorius Cibicides "sp. A" Monfort 1808 Cibicides "sp. B" Monfort 1808 Cibicides cf. neelyi Cibicides alleni Plummer 1927
Rotaliida - Anomalinidae	Anomalina midwayensis Anomalina midwayensis
Rotaliida - Gavelinellidae	Gyroidina subangulata Gyroidina subangulata
Rotaliida - Discorbidae	Eponides sp. Eponides sp. Montfort 1808
Foraminifera
- Chilostomellidae	Pullenia quiqueloba Pullenia quiqueloba