7-11 Mine (clay-ironstone horizon): Westphalian D - Stephanian A, Ohio

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Neuropteridae
Sphenopteridae
Sphenopteris cf. elegans (Brongniart 1822)
Cardiocarpales
Pinopsida - Cordaitanthales
unclassified
Spiropteris sp. Schimper 1869
may be assignable to either a filicopsid or a pteridosperm
Medullosaceae
Peltaspermopsida - Peltaspermales - Peltaspermaceae
Odontopteris brardii Brongniart 1825
Equisetopsida - Sphenophyllales
unclassified
Neuropteris heterophylla Brongniart 1825
Gigantopteridales - Gigantopteridaceae
Cycadopsida - Cycadales
unclassified
Aphlebia sp. Presl 1838
may be assignable to either a filicopsid or a pteridosperm
Lycopsida
Lycopsida indet. non-seed repro
unidentified strobili (2)
Polypodiopsida - Cyatheales - Cyatheaceae
Pecopteris hemitelioides Brongniart 1834
Polypodiopsida - Equisetales
Polypodiopsida - Equisetales - Calamitaceae
Calamites suckowii Brongniart 1828
cf. Calamostachys sp. Schimper 1869
Polypodiopsida - Marattiales
Asterotheca sp. Presl 1845
Identification tentative due to poor preservation
unclassified
Lescuropteris moorii (Lesquereux 1858)
Mixoneura sp. Weiss 1870
Pteropsida
Alethopteris sp. Sternberg 1825
unclassified
see common names

Geography
Country:United States State/province:Ohio County:Columbiana
Coordinates: 40.7° North, 80.7° West (view map)
Paleocoordinates:5.7° South, 16.6° West (Wright 2013)
Basis of coordinate:based on nearby landmark
Geographic resolution:outcrop
Time
Period: Carboniferous Epoch: Pennsylvanian
Stage: Moscovian 10 m.y. bin: Carboniferous 4 - Carboniferous 5
*Period:Late/Upper Carboniferous - Permian *Epoch:Moscovian - Kasimovian
*International age/stage:Podolskian - Noginskian *Local age/stage:Late/Upper Desmonsian - Gzelian
Key time interval: Westphalian D - Stephanian A
Age range of interval: 309.8 - 301.4 m.y. ago
* legacy (obsolete) database fields
Stratigraphy
Geological group:Conemaugh Formation:Mahoning
Stratigraphic resolution:bed
Stratigraphy comments: Between the Mahoning Coal (considered equivalent to late Desmoinesian/Westphalian D) and Brush Creek (considered equivalent to early Missourian/Stephanian A)
Lithology and environment
Primary lithology:ferruginous,sideritic silty claystone
Includes fossils?Y
Lithology description: Nine distinct, resistant, laterally continuous, clay-ironstone interbeds (ranging from 3.1-12.2 cm in thickness) occur between 0.3 and 3.8 m of the lower contact. These beds are composed of clay-siderite with small amounts of silty impurity.
Environment:lacustrine - small
Geology comments: Flocculation (adhesion of clays together) occurred. Very low energy regime. Interpreted as an oxbow lake (p. 50)
Taphonomy
Modes of preservation:adpression
Size of fossils:macrofossils
Temporal resolution:snapshot
Spatial resolution:parautochthonous
Collection methods and comments
Collection excludes:difficult macrofossils
Collection methods:field collection
Reason for describing collection:taxonomic analysis
Metadata
Database number:11187
Authorizer:H. Sims Enterer:S. Ostrowski, J. Cassara, A. McGowan
Modifier:M. Clapham Research group:paleobotany
Created:2001-07-23 08:43:24 Last modified:2025-02-22 15:12:02
Access level:the public Released:2001-07-23 08:43:24
Creative Commons license:CC0
Reference information

Primary reference:
4125. M. A. McComas. 1988. Upper Pennsylvanian compression floras of the 7-11 Mine, Columbiana County, northeastern Ohio. Ohio Journal of Science 88:48-52 [H. Sims/S. Ostrowski]