Where: Cass County, Iowa (41.2° N, 94.9° W: paleocoordinates 0.4° S, 26.0° W)
• coordinate estimated from map
When: Leavenworth Limestone Member (Oread Limestone Formation), Virgilian (303.7 - 298.9 Ma)
• Leavenworth Limestone Member of the Oread Limestone is the "middle-limestone" of the Oread Megacyclothem (Pennsylvanian, Virgilian); stratigraphic and faunal evidence suggests that the Salem School Member of northcentral Texas is time correlative with the Leavenworth Limestone
•stone
•Thickness: 2.7 feet
Environment/lithology: platform or shelf-margin reef; mudstone
•Leavenworth limestone is dark bluish-gray, fine-grained, dense, very hard, vertically jointed, moderately fossiliferous; in most localities is occurs as one prominent bed ranging in thickness from slightly under 1 foot to a max. of 3 feet; skeletal mud occurs at 27 (of 32) localities and is the dominent LL facies
•extra remark on locality: the LL is a thick (2f 7") sequence of two limestones separated by a thin gray-green shale; basal limestone unit (2f thick) superficially appears to be "typical" Leavenworth except that it contains abindant nodules of black chert and many well preserved brachiopods (Meekella and Composita); overlying this limestone unit is a thin 3" gray-green calcareous shale carrying an abundant marine microfauna overlain by a 4" gray-brown argillaceous limestone; all considered to be Leavenworth
Size classes: mesofossils, microfossils
• in addition to the algae: coated grains composed of algal crust (Archaeolithophyllum cf. lamellosum), "Osagid"-type coated grains
•silicified sponge spicules are found at localities 16, 21, 23, 27, 28, 29; sponge spicules were observed across the outcrop belt though
•fecal pellets are found but not present at localities 1,2,4,16,17,19,22, 24A, 25, 26, 28, 29
Primary reference: D.F. Toomey. 1969. The Biota of the Pennsylvanian (Virgilian) Leavenworth Limestone, Midcontinent Region Part I: Stratigraphy, Paleogeography, and Sediment Facies Relationships. Journal of Paleontology 43(4):1001-1018 [B. Seuss/B. Seuss/B. Seuss]more details
Purpose of describing collection: biostratigraphic analysis
PaleoDB collection 217128: authorized by Barbara Seuss, entered by Barbara Seuss on 25.01.2021
Creative Commons license: CC BY (attribution)
Taxonomic list
unclassified | |
Tubothalamea | |
Foraminifera | |
Reophax ? sp.3 de Montfort 1808 | |
Bradyina magna2 Roth and Skinner 1930 | |
Globivalvulina bulloides2 Brady 1876 | |
| |
Rhodophyceae | |
Foliophycus sp.1 Johnson 1960 | |
Florideophyceae | |
Ulvophyceae | |
Hormogoneae | |
Girvanella sp.1 Nicholson and Etheridge 1878 | |
Conodonta | |
"Ozarkodina minuta" = Hindeodus minutus4
| |
| |
unclassified | |
Porifera indet.4 Grant 1836 tetraxon spicule (probbly orthotriaene), triaxon spicules (clinopentactines, spinose orthohexactine, orthopentactine, plagiotriaene); spicules
| |
Cuneiphycus | |
Shamovella | |
"Tubiphytes cf. obscurus" = Shamovella obscura1
"Tubiphytes cf. obscurus" = Shamovella obscura1 Maslov 1956 |