USGS 07569 (Cretaceous of the United States)

Also known as Residual concretions of calcareous sandstone in a field just south of Chatfield, Navarro County; from upper part of formation.

Where: Navarro County, Texas (32.1° N, 96.5° W: paleocoordinates 36.9° N, 68.8° W)

• coordinate based on political unit

• outcrop-level geographic resolution

When: Nostoceras hyatti ammonoid zone, Nacatoch Sand Formation, Late/Upper Campanian (83.5 - 70.6 Ma)

• Stephenson (1941) had this unit as Maastrichtian, Cobban and Kennedy (1995) have updated it to uppermost Campanian via ammonite zonation.

• group of beds-level stratigraphic resolution

Environment/lithology: marine; concretionary, calcareous sandstone

• Residual concretions of calcareous sandstone

Size class: mesofossils

Reposited in the USGS

• L. W. Stephenson 1911

Primary reference: L. W. Stephenson. 1941. The larger invertebrate fossils of the Navarro group of Texas. The University of Texas Publication 4101:1-625 [M. Kosnik/M. Kosnik]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 7500: authorized by Matt Kosnik, entered by Matt Kosnik on 18.07.2000

Creative Commons license: CC BY (attribution)

Taxonomic list

Polychaeta
 Sabellida - Serpulidae
Serpula cretacea
Serpula cretacea (Conrad)
Bivalvia
 Arcida - Arcidae
Breviarca nolani clam
Breviarca nolani Stephenson
 Myalinida - Inoceramidae
Inoceramus ? vanuxemi clam
Inoceramus vanuxemi Meek and Hayden?
 Pectinida - Entoliidae
? Syncyclonema (Syncyclonema) archeri scallop
Pecten (Syncyclonema?) archeri Stephenson
 Pholadida - Corbulidae
Corbula rockensis clam
Corbula rockensis Stephenson
Caestocorbula crassaplica Vincent 1910 clam
Corbula crassiplica Gabb
 Cardiida - Arcticidae
Veniella conradi Morton 1833 clam
Veniella conradi (Morton)
 Cardiida - Mactridae
Cymbophora scabellum clam
Cymbophora scabellum Stephenson
Cymbophora simpsonensis clam
Cymbophora simpsonensis Stephenson
 Cardiida - Veneridae
Legumen ellipticum venus clam
Legumen ellipticum Conrad
 Cardiida - Cardiidae
Ethmocardium (Ethmocardium) welleri cockle
Cardium (Ethmocardium) welleri Stephenson
Granocardium (Granocardium) sp. Gabb 1868 cockle
Cardium (Granocardium) spp.
 Solenida - Pharidae
Leptosolen biplicata Conrad 1858 clam
Leptosolen biplicatus Conrad
 Poromyida - Poromyidae
Liopistha formosa clam
Liopistha formosa Stephenson
Liopistha protexta Conrad 1853 clam
Liopistha protexta (Conrad)
 Lucinida - Lucinidae
Lucina chatfieldana clam
Lucina chatfieldana Stephenson
 Nuculida - Nuculidae
Nucula chatfieldensis nut clam
Nucula chatfieldensis Stephenson
 Protobranchia -
Malletia longifrons clam
Nuculana longifrons (Conrad)
 Protobranchia - Nuculanidae
Nuculana sp. Link 1807 pointed nut clam
Nuculana sp. a Stephenson 1941
Gastropoda
 Cephalaspidea - Cylichnidae
Cylichna secalina Shumard 1861 snail
Cylichna secalina Shumard
 Neogastropoda - Volutidae
? Liopeplum leioderma Conrad 1860 volute
Liopeplum lioderma longum Stephenson
 Stromboidea - Aporrhaidae
Anchura lamari snail
Anchura lamari Stephenson
 Sorbeoconcha - Turritellidae
Turritella houstonia turret shell
Turritella houstoni Stephenson
"Haustator trilira" = Turritella trilira Conrad 1860 turret shell
Turritella trilira Conrad
 Tectibranchia - Scaphandridae
Ellipsoscapha striatella Shumard 1861 snail
Ellipsoscapha striatella (Shumard)
Cephalopoda
 Ammonitida - Nostoceratidae
"Nostoceras helicinum" = Nostoceras helicinus, "Nostoceras stantoni" = Nostoceras approximans
"Nostoceras helicinum" = Nostoceras helicinus Shumard 1861 ammonite
Nostoceras helicinum crassum Stephenson
"Nostoceras stantoni" = Nostoceras approximans Conrad 1855 ammonite
Nostoceras stantoni Hyatt