Fountain Formation: Morrowan - Atokan, Colorado

List of taxa
Where & when
Taphonomy & methods
Metadata & references
Taxonomic list
Medullosaceae indet. leaf Göppert 1864
seed fern pinnules
Mariopteris cf. pygmaea leaf
Cyclopteris sp. leaf Brongniart 1828
Polypodiopsida - Equisetales - Calamitaceae
Calamites cistii axis
Calamites distachyus axis
Calamites cruciatus axis
Lepidodendrales - Lepidodendraceae
Lepidophloios laricinus axis (Sternberg 1820)
Lepidophylloides sp. leaf Snigirevskaya 1958
Lepidostrobophyllum sp. non-seed repro Hirmer 1927
Sigillaria cf. elegans axis
Sigillaria ovata axis
Sigillaria sp. axis Brongniart 1822
Syringodendron sp. axis Sternberg 1820
Stigmaria ficoides root Sternberg 1822
Lepidostrobus sp. non-seed repro Brongniart 1828
Neuropteris cf. gigantea leaf Sternberg 1825
recombined as Paripteris gigantea
mesophyll visible on partly petrified specimens
see common names

Country:United States State/province:Colorado County:Fremont
Coordinates: 38.4° North, 105.2° West (view map)
Paleocoordinates:1.2° South, 37.1° West
Basis of coordinate:based on nearby landmark
10 m.y. bin:Carboniferous 4
*Period:Middle Carboniferous - Late/Upper Carboniferous *Epoch:Bashkirian - Moscovian
*International age/stage:Duckmantian - Vereiskian *Local age/stage:Morrowan - Atokan
Key time interval:Morrowan - Atokan
Age range of interval:318.10000 - 311.45000 m.y. ago
* legacy (obsolete) database fields
Lithology and environment
Primary lithology:red,white,yellow "siliciclastic"
Secondary lithology:bioturbation,paleosol/pedogenic,red mudstone
Includes fossils?Y
Includes fossils?Y
Lithology description: At the first locality various types of plant impressions are present in the interbedded red sandstone and maroon to buff siltstone adjacent to the lower contact of the Fountain. Sandstones are described as arkosic. At the second mudstone that overlies the lowermost arkosic sandstone of the Fountain Formation. This mudstone is believed to represent a paleosol with stigmarian axes preserved in situ. Third locality (West of Garden Park) includes a basal fine-grained red sandstone
Environment:fluvial indet.
Geology comments: Second locality described as a paleosol.

Fountain Formation is generally regarded as a fluvial, orogenic basin
Modes of preservation:cast,mold/impression,permineralized,replaced with hematite
Size of fossils:macrofossils
Disassociated major elements:some
Disassociated minor elements:some
Spatial resolution:parautochthonous
Collection methods and comments
Collection methods:field collection
Reason for describing collection:taxonomic analysis
Museum repositories:UMMP
Database number:11205
Authorizer:H. Sims Enterer:S. Ostrowski, A. McGowan
Modifier:A. McGowan Research group:paleobotany
Created:2001-07-23 09:11:55 Last modified:2003-07-18 18:05:03
Access level:the public Released:2001-07-23 09:11:55
Creative Commons license:CC BY
Reference information

Primary reference:

4133. J. R. Jennings. 1980. Fossil plants from the Fountain Formation (Pennsylvanian) of Colorado. Journal of Paleontology 54(1):149-158 [H. Sims/S. Ostrowski/M. Uhen]