New Madrid test well 1-X, 1544-1671 ft: Danian, Missouri

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Coccolithophyceae
Lanternithus cf. duocavus
Markalius inversus (Deflandre 1954)
Coccolithophyceae - Braarudosphaeraceae
Braarudosphaera bigelowi
Coccolithophyceae
Coccolithus pelagicus (Wallich 1877)
Neochiastozygus concinnus Perch-Nielsen 1971
Cruciplacolithus tenuis (Stradner 1961)
original and current combination Heliorthus tenuis
Coccolithophyceae - Eiffellithales - Chiastozygaceae
Zygodiscus sigmoides Bramlette and Sullivan 1961
recombined as Zeugrhabdotus sigmoides
Coccolithophyceae - Isochrysidales - Noelaerhabdaceae
Cepekiella aff. lumina
Coccolithophyceae - Coccolithales - Coccolithaceae
Chiasmolithus consuetus (Bramlette and Sullivan 1961)
original and current combination Coccolithus consuetus
Ericsonia subpertusa
Dinophyceae - Thoracosphaerales
Thoracosphaera spp.
see common names

Geography
Country:United States State/province:Missouri County:New Madrid
Coordinates: 36.4° North, 89.6° West (view map)
Paleocoordinates:39.7° North, 68.3° West
Basis of coordinate:estimated from map
Geographic resolution:hand sample
Time
Period:Paleogene Epoch:Paleocene
Stage:Danian 10 m.y. bin:Cenozoic 1
Key time interval:Danian
Age range of interval:66.00000 - 61.60000 m.y. ago
Stratigraphy
Formation:Porters Creek
Local section:New Madrid test well 1-X Local bed:1544-1671 ft
Stratigraphy comments: Eleven samples from the lower part of the Porters Creek Clay at 1544 to 1671 ft contain an assemblage from Zone NP3 (Danian).
Lithology and environment
Primary lithology:hardground,micaceous,pyritic,gray claystone
Includes fossils?Y
Lithology description: Steel-gray to dark-gray, hard, micaceous clay; disseminated organic material common; locally mottled yellow-buff; conchoidal fracture; locally fossiliferous; pyrite common.
Environment:marginal marine indet.
Taphonomy
Modes of preservation:body,original calcite
Size of fossils:microfossils
Temporal resolution:time-averaged
Spatial resolution:allochthonous
Collection methods and comments
Collection methods:core,survey of museum collection
Reason for describing collection:biostratigraphic analysis
Museum repositories:USGS
Metadata
Database number:231964
Authorizer:P. Jardine Enterer:H. Morck
Modifier:H. Morck Research group:micropaleontology
Created:2023-10-10 05:16:22 Last modified:2023-10-11 04:13:24
Access level:the public Released:2023-10-10 05:16:22
Creative Commons license:CC BY
Reference information

Primary reference:
85852. 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]