Re-examination of laminated osagid grains from a Lower Permian midcontinent limestone

Journal Article · Wed Feb 01 04:00:00 EST 1989 · Palaois; (USA)

DOI:https://doi.org/10.2307/3514733· OSTI ID:6966854

Toomey, D F ^[1]; Lowenstein, T K ^[2]; Mitchell, R W ^[3]

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1. Conoco Inc., Ponca City, OK (USA)
2. State Univ. of New York, Binghamton (USA)
3. E.I. du Pont de Nemours Company, Pasadena, TX (USA)

Osagid grains from the Lower Permian (Wolfcamp) Winfield Limestone of southern Kansas-northern Oklahoma are small accretionary structures formed in shallow, well-agitated waters on a carbonate shelf. Osagid grains consist of small shell fragments serving as nuclei, which during formation were rolled about and coated by roughly concentric algal-foraminiferal laminations. Their shapes range from round to subround to elliptical, dependent primarily on the size and shape of the shell nuclei. Grain laminae are dark micrite which in places contain tubules of the blue-green alga Girvanella, and/or various encrusting foraminifers, with either calcareous or agglutinated tests, or intermixtures of all three components. Formic acid etching of individual osagid grains indicates that the agglutinated foraminiferal component is of greater importance than previously believed and can be their principal biotic component. Girvanella tubules appear to be most susceptible to diagenetic alteration, with the end-product generally a dark, micritic groundmass of algal dust. Since these accretionary structures are not true biological species, the generic term Osagia should be dropped and these structures should be called osgid grains.

• OSTI ID: 6966854
• Journal Information: Palaois; (USA), Journal Name: Palaois; (USA) Vol. 4:1; ISSN PALAE
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
580000* -- Geosciences
ALGAE
ANIMALS
CARBONATE ROCKS
CORRELATIONS
CRYSTAL STRUCTURE
DIAGENESIS
FEDERAL REGION VI
FEDERAL REGION VII
FORAMINIFERA
GEOLOGIC DEPOSITS
GEOLOGY
INVERTEBRATES
KANSAS
LITHOLOGY
MICROORGANISMS
MINERALOGY
MINERALS
NORTH AMERICA
OKLAHOMA
PALEONTOLOGY
PLANTS
PROTOZOA
ROCKS
SARCODINA
SEDIMENTARY ROCKS
STRATIGRAPHY
USA