Where: Burleson County, Texas (30.6° N, 96.5° W: paleocoordinates 32.7° N, 85.6° W)
• coordinate based on nearby landmark
• outcrop-level geographic resolution
When: Stone City Member (Crockett Formation), Lutetian (47.8 - 41.3 Ma)
• The age of strata exposed at Stone City Bluff is established using biostratigraphy and radiometric dating of volcanic ash beds in the overlying Wheelock Member of the Crockett Formation. Calcareous nannoplankton indicates an age of biochronozone NP16 (Yancey and Davidoff, 1991, p. 80) and planktic foraminifers indicate deposition during the Morozovella lehneri (P12) or Orbulinoides beckmanni (P13) zones (Gaskell, 1989). A 25 cm thick volcanic ash bed present in overlying strata of the Crockett Formation, about 15 m above the Moseley bed (Kersey and Stanton, 1979), has an 40Ar/39Ar radiometric date of 41.841 ± 0.016 Ma (Heintz et al., 2015). The ash-bearing strata are further corroborated as upper part of biochronozone NP16 by Marie-Pierre Aubry (2002, unpublished report) and the upper part of biochronozone P12 (= E10–E11 biochronozones) by W. A. Berggren (2004, unpublished report), based on an overlap of Acarinina bullbrooki and Turborotalia pomeroli. Therefore, late Lutetian in age.
• group of beds-level stratigraphic resolution
Environment/lithology: transition zone or lower shoreface; unlithified, glauconitic, argillaceous sandstone
Size class: mesofossils
Primary reference: K. V. Palmer and D. C. Brann. 1965. Catalogue of the Paleocene and Eocene mollusca of the southern and eastern United States. Part 1. Pelecypoda, Amphineura, Peteropoda, Scaphopoda and Cephalopoda. Bulletins of American Paleontology 48:1-471 [M. Kosnik/M. Kosnik/J. Alroy]more details
Purpose of describing collection: taxonomic analysis
PaleoDB collection 90651: authorized by Jocelyn Sessa, entered by Laurie Eccles on 12.08.2009, edited by Ursula Smith
Creative Commons license: CC BY (attribution)
Taxonomic list
Gymnolaemata | |
Bivalvia | |
"Yoldia (Orthoyoldia) psammotaea" = Orthoyoldia psammotaea2, Yoldia (Calorhadia) compsa2, Adrana aldrichiana
Adrana aldrichiana Harris 1895 pointed nut clam | |
"Tellina mooreana" = Tellina (Eurytellina) mooreana2
| |
"Verticordia (Trigonulina) satex" = Trigonulina
"Verticordia (Trigonulina) satex" = Trigonulina clam | |
Crassatella antestriata Gabb 1860 clam | |
Gastropoda | |
cf. Rhizorus volutatus snail
Rhizorus loisae snail | |
Tiburnus texanus snail | |
Scalina trapaquara wentletrap | |
Balcis exilis snail
Balcis tenua snail | |
Teinostoma texanum Palmer 1937 snail | |
| |
Natica spp. Scopoli 1777 moon snail | |
Atlanta eocenica snail | |
"Ficopsis texana" = Ficus
"Ficopsis texana" = Ficus fig shell | |
"Ectinochilus texanum" = Rimella
"Ectinochilus texanum" = Rimella true conch | |
"Distorsio (Personella) septemdentata" = Sassia (Personella) septemdentata
"Distorsio (Personella) septemdentata" = Sassia (Personella) septemdentata Gabb 1860 triton shell | |
Volvaria reticulata, "Mitra (Fusimitra) perexilis" = Fusimitra
Volvaria reticulata Johnson 1899 mitre shell
"Mitra (Fusimitra) perexilis" = Fusimitra mitre shell | |
Hexaplex (Hexaplex) silvaticus Palmer 1937 murex snail | |
"Bullata semenoides" = Closia (Bullata) volute | |
Marginella (Dentimargo) constrictoides margin shell | |
Awateria retifera, Scobinella reticulatoides, Cochlespirella nana, "Coronia genitiva" = Gemmula (Coronia) genitiva, Hesperiturris nodocarinatus, Michela trabeatoides, Trypanotoma longispira, Eucheilodon reticulata
Awateria retifera Gabb 1860 turrid
Scobinella reticulatoides turrid
Cochlespirella nana turrid
"Coronia genitiva" = Gemmula (Coronia) genitiva Casey 1904 turrid
Hesperiturris nodocarinatus Gabb 1860 turrid
Michela trabeatoides Harris 1895 turrid
Trypanotoma longispira turrid
Eucheilodon reticulata turrid | |
Cochlespira bastropensis snail
Cochlespira engonata Conrad 1865 snail | |
Turricula (Plentaria) plenta snail Turricula (Plentaria) plenta and Turricula (Plentaria) plenta horrida
| |
Glyptotoma conradiana, "Conus (Lithoconus) sauridens" = Conus sauridens
Glyptotoma conradiana cone shell
"Conus (Lithoconus) sauridens" = Conus sauridens Conrad 1833 cone shell | |
"Falsifusus" perobliquus snail | |
Buccitriton "sp. B" true whelk
Buccitriton texanum true whelk
Buccitriton sagenum Conrad 1833 true whelk
Bolis enterogramma true whelk | |
Coptostoma rameum snail
Trigonostoma penrosei snail
Trigonostoma babylonicum Lea 1833 snail
Bonellitia parilis snail | |
Pyramimitra terebraeformis Conrad 1848 ribbed mitre | |
"Turritella dumblei" = Kapalmerella dumblei, Mesalia claibornensis, "Turritella infans" = Haustator infans, Turritella houstonia
"Turritella dumblei" = Kapalmerella dumblei Harris 1895 turret shell
Mesalia claibornensis turret shell
"Turritella infans" = Haustator infans Stenzel 1940 turret shell
Turritella houstonia turret shell | |
| |
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Ringicula trapaquara snail | |
Pseudomalaxis plummerae snail
Architectonica vespertina sundial | |
Odostomia trapaquara, "Pyramidella (Syrnola) propeacicula" = Syrnola, Pyramidella bastropensis, Pyramidella pseudopymaea
Odostomia trapaquara snail
"Pyramidella (Syrnola) propeacicula" = Syrnola snail
Pyramidella bastropensis snail | |
Cephalopoda | |
Aturia brazoensis Stenzel 1935 nautiloid |