New Madrid test well 1-X, 1105-1110 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: Flour Island Formation, Paleocene (66.0 - 56.0 Ma)

• The top of the Paleocene is probably at about 1105 ft.

•This sample is Paleocene but probably includes cavings from the lower Eocene.

Environment/lithology: marine; fine, micaceous, pyritic, gray, yellow, silty, sandy claystone

• Medium- to light-gray silty clay and clayey silt containing thin beds of fine- to very fine-grained light yellowish-gray sand; commonly contains lignite, pyrite, and mica.

Size class: microfossils

Preservation: original sporopollenin

Reposited in the USGS

Collection methods: core, chemical, hydrochloric, hydroflouric,

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 231938: authorized by Phillip Jardine, entered by Hannah Morck on 06.10.2023

Creative Commons license: CC BY (attribution)