USGS 10870, San Geronimo Creek: Late/Upper Maastrichtian, Texas
collected by L.W. Stephenson

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Demospongiae - Clavulina - Clionaidae
Cliona sp.
Sohl and Koch 1984
Clione sp.
Cephalopoda - Ammonitida - Sphenodiscidae
Sphenodiscus pleurisepta (Conrad 1857)
Sohl and Koch 1984 1 specimen
Sphenodiscus pleurisepta (Conrad)
Gastropoda - Turritellidae
Turritella sp. Lamarck 1799
Sohl and Koch 1984 1 specimen
Turritella sp.
Gastropoda - Neogastropoda - Fasciolariidae
? Drilluta sp. Wade 1916
Sohl and Koch 1984 1 specimen
Drilluta ? sp. - originally entered as "Drilluta ? sp."
Bivalvia - Pectinida - Plicatulidae
Plicatula (Plicatula) mullicaensis
Sohl and Koch 1984 2 specimens
Plicatula (Plicatula) mullicaensis
Bivalvia - Pectinida - Limidae
Lima (Lima) geronimoensis Stephenson 1941
Sohl and Koch 1984 1 specimen
Lima (Lima) geronimoensis Stephens
Bivalvia - Pectinida - Neitheidae
Neithea (Neitheops) sp. (Stewart 1930)
Sohl and Koch 1984 1 specimen
original and current combination Neitheops
Neithea (Neitheops) sp.
Bivalvia - Ostreida - Gryphaeidae
Pycnodonte vesicularis (Lamarck 1806)
Sohl and Koch 1984 1 specimen
recombined as Pycnodonta vesicularis
Pycnodonte vesicularis Lamarck
Exogyra costata (Say 1820)
Sohl and Koch 1984 12 specimens
original and current combination Exogyra (Exogyra) costata
Exogyra costata Say
Bivalvia - Ostreida - Ostreidae
Ostrea mesenterica Morton 1834
Sohl and Koch 1984 2 specimens
recombined as Lopha mesenterica
Ostrea mesenterica Morton
unclassified
Bryozoa indet. Ehrenberg 1831
Sohl and Koch 1984
Bryozoa (encrusting)
Polychaeta - Sabellida - Serpulidae
Serpula sp. Linnaeus 1758
Sohl and Koch 1984
Serpula sp.
Echinoidea - Spatangoida - Micrasteridae
Micraster americanus (Stephenson 1941)
Echinoidea - Spatangoida - Schizasteridae
Linthia variabilis Slocom 1909
Sohl and Koch 1984
Linthia variabilis Slocum
Echinoidea - Cassiduloida
Hardouinia dalli
Sohl and Koch 1984
corrected as Harduinia
Hardouinea dalli Clark
see common names

Geography
Country:United States State/province:Texas County:Medina
Coordinates: 29.5° North, 98.8° West (view map)
Paleocoordinates:35.2° North, 77.9° West
Geographic resolution:outcrop
Time
Period:Cretaceous Epoch:Late/Upper Cretaceous
Stage:Maastrichtian 10 m.y. bin:Cretaceous 8
*Period:Late/Upper Cretaceous *Epoch:Late/Upper Senonian
*International age/stage:Middle - Late/Upper Maastrichtian
Key time interval:Late/Upper Maastrichtian Ammonoid zone: Discoscaphites conradi
Age range of interval:70.60000 - 66.00000 m.y. ago
* legacy (obsolete) database fields
Stratigraphy
Formation:Corsicana Marl
Stratigraphic resolution:formation
Stratigraphy comments: Haustator bilira assemblage zone
Lithology and environment
Primary lithology:glauconitic claystone
Environment:marine indet. Tectonic setting:passive margin
Taphonomy
Modes of preservation:body,original calcite
Size of fossils:mesofossils
Collection methods and comments
Collection methods:field collection
Reason for describing collection:paleoecologic analysis
Museum repositories:USNM
Collectors:L.W. Stephenson
Collection method comments: Stephenson collection
Metadata
Also known as:Sohl and Koch OFR # 771
Database number:4520
Authorizer:M. Kosnik, W. Kiessling Enterer:M. Kosnik, U. Merkel
Modifier:M. Clapham Research group:GCP,marine invertebrate
Created:1999-08-14 13:00:00 Last modified:2018-11-23 00:59:42
Access level:the public Released:1999-08-14 13:00:00
Creative Commons license:CC BY
Reference information

Primary reference:

26335.1% 20600C. W. Cooke. 1953. American Upper Cretaceous Echinoidea. United States Geological Survey Professional Paper 254-A:1-44 [W. Kiessling/U. Merkel/M. Clapham]

Secondary references:

29915 J. A. Sessa, T. J. Bralower, M. E. Patzkowsky, J. C. Handley, and L. C. Ivany. 2012. Environmental and biological controls on the diversity and ecology of Late Cretaceous through early Paleogene marine ecosystems in the US Gulf Coastal Plain. Paleobiology 38(2):218-239 [M. Patzkowsky/J. Sessa/J. Sessa]
282 N. F. Sohl and C. F. Koch. 1984. Upper Cretaceous (Maestrichtian) larger invertebrate Fossils from the Haustator bilira Assemblage Zone in the west gulf Coastal Plain. USGS Open File Report 84-687:1-282 [M. Kosnik/M. Kosnik]