Evans Peak: Bashkirian - Gzhelian, Colorado

List of taxa
Where & when
Taphonomy & methods
Metadata & references
Taxonomic list
Neuropteris ? gigantea leaf Sternberg 1825
recombined as Paripteris gigantea
Neuropteris heterophylla leaf Brongniart 1825
recombined as Imparipteris heterophylla
Diplothmema patentissima leaf
Dactylophyllum johnsoni n. gen., n. sp. leaf Read 1934
Lepidodendrales - Lepidodendraceae
Lepidodendron sp. Sternberg 1820
Cordaianthus sp. leaf Grand'Eury 1877
Peltaspermopsida - Trichopityales - Trichopityaceae
Trichopitys whitei leaf
Neuropteris dluhoschi leaf
Stigmaria verrucosa
Polypodiopsida - Equisetales - Calamitaceae
Calamites sp. Suckow 1784
Asterophyllites ? longifolius leaf
Polypodiopsida - Hymenophyllales - Hymenophyllaceae
Eusphenopteris sp. Weiss 1882
Polypodiopsida - Polypodiaceae
Adiantites rockymontanus n. sp. leaf
Sphenopteris cheathami leaf
Sphenopteris cf. microcarpa leaf
Sphenopteris asplenioides leaf
Pinopsida - Cordaitanthales
Cordaites sp. Unger 1850
Lepidostrobus weberensis n. sp. seed repro
Cordaitopsida - Cordaitaceae
Cordaicarpon sp. seed/fruit Geinitz 1862
almost certainly a new species
Neuralethopteris sp. Cremer 1893
see common names

Country:United States State/province:Colorado
Coordinates: 38.3° North, 106.3° West (view map)
Paleocoordinates:0.0° South, 37.0° West
Basis of coordinate:based on nearby landmark
Geographic resolution:outcrop
Period:Carboniferous Epoch:Pennsylvanian
*Period:Late/Upper Carboniferous *Local age/stage:Middle Pottsville
Key time interval:Bashkirian - Gzhelian
Age range of interval:323.20000 - 298.90000 m.y. ago
* legacy (obsolete) database fields
Local section:Evans Peak Local bed:17
Local order:bottom to top
Stratigraphic resolution:bed
Stratigraphy comments: The names "Weber shales" and "Weber grits" were rejected by USGS
Lithology and environment
Primary lithology:micaceous sandstone
Secondary lithology:micaceous "shale"
Lithology description: the formation comprises a lower thin shaly division and a much thicker upper sandy and conglomeratic division, the two aggregating 1,000ft in the Leadville distict, but thickening to 2,800ft in adjacent regions. These are often spoken of as the "Weber shales" and "Weber grits". Thin beds of limestones containing invertebrates occur at several horizons. Both the shales and sandstones are highly micaceous.
Environment:terrestrial indet.
Size of fossils:macrofossils,mesofossils
Disassociated major elements:some
Disassociated minor elements:some
Spatial resolution:parautochthonous
Collection methods and comments
Collection excludes:some macrofossils,some microfossils
Collection methods:field collection
Reason for describing collection:taxonomic analysis
Database number:11206
Authorizer:H. Sims Enterer:S. Ostrowski, A. McGowan
Modifier:A. McGowan Research group:paleobotany
Created:2001-07-23 09:14:35 Last modified:2003-09-15 13:51:59
Access level:the public Released:2001-07-23 09:14:35
Creative Commons license:CC BY
Reference information

Primary reference:

4134. C. B. Read. 1934. A flora of Pottsville age from the Mosquito Range, Colorado. U.S. Geological Survey Prof. Paper 185-D:79-96 [H. Sims/S. Ostrowski/J. Cassara]