Where: Catahoula County, Louisiana (31.9° N, 92.0° W)
• Paleocoordinates: 35.7° N, 81.2° W (Wright 2013)
• coordinate based on nearby landmark
• outcrop-level geographic resolution
When: Rosefield Marl Member (Mosley Hill Formation), Late/Upper Oligocene (28.4 - 23.0 Ma)
• "The Rosefield Marl Beds are Oligocene in age (approximately 34 million years old) and correspond to the P19 planktonic foraminiferal zonation."
Environment/lithology: offshore shelf; unlithified, shelly/skeletal marl and brown claystone
Size classes: macrofossils, mesofossils, microfossils
Preservation: original calcite
Collection methods: bulk, surface (in situ), sieve,
• "Bulk and surface sampling were utilized at the type locailty of the Rosefield Marl Beds for this study. Approximately 40kg of sample was collected from the coquina layer (shell bed of early publications) for vertebrated analysis(primarily for fish otoliths). The bulk sample was wet-screened through a 40-mesh sieve and air drid. Microfaunal samples (approximately 1kg) were taken from the coquina layer and a thin clay layer immediately above the coquina. Samples were dried and wet-screened through a 200 mesh screen, heat-dried in an oven then picked for microfauna, including foraminifera, ostracodes, microinvertebrates, and microvertebrates. Systematic surface collections were also utilized at the type locality (the exposure of the coquinia layer is quite limited). Basically all macroscopic remains that were one-half whole or greater were collected."
Primary reference: G. L. Stringer, S. Q. Breard, and M. Kontrovitz. 2001. Biostratigraphy and Paleoecology of Diagnostic Invertebrates and Vertebrates from the Type Locality of the Oligocene Rosefiled Marl Beds, Louisiana. Gulf Coast Association of Geological Societies Transactions LI:321-328 [L. Ivany/P. Wall/P. Wall]more details
Purpose of describing collection: biostratigraphic analysis
PaleoDB collection 44521: authorized by Linda Ivany, entered by Patrick Wall on 15.09.2004
Creative Commons license: CC BY (attribution)
Taxonomic list
unclassified | |
Tubothalamea | |
Spiroloculina sp. d'Orbigny 1826 | |
Foraminifera | |
Planorbulina mediterranensis d'Orbigny 1826 | |
Globigerina sp. d'Orbigny 1826 | |
Globothalamea | |
Nodosariata | |
Lagena hexagona, Nodosaria vertebralis, Vaginulina sp., Planularia sp., Dentalina emaciata, Dentalina monroei, Dentalina praecatesbyi, Dentalina pseudoinvolons, Dentalina hantkeni, Chrysalogonium vicksburgense
Lagena hexagona Williamson 1848
Nodosaria vertebralis Brady 1884
Vaginulina sp. d'Orbigny 1826
Planularia sp. Defrance 1826
Dentalina hantkeni Cushman 1935 | |
Foraminifera | |
"Elphidium poeyanum" = Elphidium latispatium pontium
"Elphidium poeyanum" = Elphidium latispatium pontium d'Orbigny 1948 | |
"Marginulina sp." = Cristellaria (Marginulina)
"Marginulina sp." = Cristellaria (Marginulina) d'Orbigny 1826 | |
Gymnolaemata | |
Gymnolaemata indet. Allman 1856 | |
Gastropoda | |
"Albula sp." = Polinices
"Albula sp." = Polinices Monfort 1810 moon snail | |
Bivalvia | |
"Pecten perplanus" = Pecten (Pecten) perplanus
| |
Scaphopoda | |
Dentalium mississippiense Conrad 1848 tusk shell | |
Ostracoda | |
Cytherelloidea chawneri Howe and Law 1936 ostracod
Cytherelloidea byramensis Howe and Law 1936 ostracod | |
Cytherella sp. Jones 1849 ostracod | |
Cytheromorpha rosefieldensis Howe and Law 1936 ostracod
Loxoconcha woodwordensis ostracod | |
Buntonia huneri ostracod
Actinocythereis rosefieldensis ostracod | |
"Pontocythere sp." = Cushmanidea
"Pontocythere sp." = Cushmanidea ostracod | |
Jugosocythereis sp. ostracod
Echinocythereis mcguirti ostracod | |
Paracypris rosefieldensis Howe and Law 1936 ostracod | |
Actinopteri | |
| |
Citharichthys sp. Bleeker 1862 flatfish | |
Centropristis sp. Cuvier 1829 perch-like fish | |
Haemulidae indet. Gill 1885
Orthopristis sp. Girard 1858 | |
| |
Centroberyx sp. Gill 1862 | |
Bregmaceros sp. Thompson 1840 | |
Ariosoma sp. Swainson 1838 conger eel
Gnathophis dissimilis conger eel
Paraconger sp. Kanazawa 1961 conger eel | |
Anthozoa | |
"Archohelia vicksburgensis" = Petrophyllia
"Archohelia vicksburgensis" = Petrophyllia stony coral | |
Balanophyllia caulifera Conrad 1848 stony coral |