Hannahatchee Creek ‘‘longwalk’’ outcrop (Cretaceous of the United States)

Where: Stewart County, Georgia (32.2° N, 85.0° W: paleocoordinates 34.1° N, 56.7° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Blufftown Formation, Campanian (83.6 - 72.1 Ma)

• many layers are fossiliferous, but only one contains vertebrates

• bed-level stratigraphic resolution

Environment/lithology: transition zone or lower shoreface; argillaceous, silty claystone and fine-grained, concretionary, micaceous, shelly/skeletal, gray, silty, calcareous sandstone

• silty, fine sandy clay, medium sandy clay, silty clay, (several units with varying amounts of silt, sand and clay in each). Unit bearing vertebrates is "Clayey fine sand and silty clay, micaceous, lignitic, very fossiliferous, olive-gray (5 Y 3/2). Calcareous, sandy concretions abundant throughout unit. Zones of molluscan hash locally present. Prominent erosional horizon in lower meter, traceable throughout exposure, features abundant vetebrate bones and teeth, and very-large-oyster bioherm. "

Size class: macrofossils

Preservation: trace, replaced with phosphate

Primary reference: D. R. Schwimmer. 1986. Late Cretaceous fossils from the Blufftown Formation (Campanian) in western Georgia. The Mosasaur 3:109-123 [J. Alroy/E. Leckey/E. Leckey]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 35289: authorized by John Alroy, entered by Erin Leckey on 24.11.2003, edited by Kaitlin Maguire, Mark Uhen and Matthew Carrano

Creative Commons license: CC BY (attribution)

Taxonomic list

• IHay (1908) reviewed the systematics of the Peritresius ornatus, and included a description that had been reported by Cope (1878). This turtle almost certainly came from this locality. Cope collected other material from the Blufftown for which exact locality information is not available.
Bivalvia indet. Linnaeus 1758 clam
 Ostreida - Gryphaeidae
Exogyra ponderosa oyster
var. erraticostata
 Ostreida - Ostreidae
 Naticoidea - Naticidae
"Albula sp." = Polinices
"Albula sp." = Polinices Monfort 1810 moon snail
 Ammonitida - Placenticeratidae
Placenticeras sp. Meek 1876 ammonite
 Squatiniformes - Squatinidae
Squatina hassei Leriche 1929 angel shark
 Hybodontiformes - Hybodontidae
Hybodus sp. Agassiz 1837 elasmobranch
 Hybodontiformes - Lonchidiidae
Lonchidion babulskii Cappetta and Case 1975 elasmobranch
 Sclerorhynchiformes - Sclerorhynchidae
Ischyrhiza mira Leidy 1856 elasmobranch
I. mira mira
 Sclerorhynchiformes - Ptychotrygonidae
Ptychotrygon vermiculata Cappetta 1975 elasmobranch
 Myliobatiformes - Myliobatidae
Pseudohypolophus sp. Cappetta and Case 1975 eagle ray
Brachyrhizodus wichitaensis Romer 1942 eagle ray
 Myliobatiformes - Rhombodontidae
"Rhombodus levis" = Rhombodus laevis
"Rhombodus levis" = Rhombodus laevis Cappetta and Case 1975 stingray
 Lamniformes - Anacoracidae
Pseudocorax affinis Agassiz 1843 mackerel shark
Squalicorax kaupi Agassiz 1843 crow shark
 Lamniformes - Mitsukurinidae
Scapanorhynchus texanus Roemer 1852 goblin shark
 Lamniformes - Cretoxyrhinidae
Cretolamna appendiculata, "Plicatolamna borodini" = Cretodus borodini
Cretolamna appendiculata Agassiz 1843 mackerel shark
C. appendiculata lata
"Plicatolamna borodini" = Cretodus borodini Cappetta and Case 1975 mackerel shark
 Heterodontiformes - Heterodontidae
Heterodontus sp. de Blainville 1816 bullhead shark
 Orectolobiformes - Ginglymostomatidae
Ginglymostoma globidens Cappetta and Case 1975 nurse shark
 Elopiformes - Phyllodontidae
Paralbula casei Estes 1969
 Salmoniformes - Enchodontidae
 Ichthyodectiformes - Ichthyodectidae
Xiphactinus audax Leidy 1870
 Pycnodontiformes - Pycnodontidae
 Amiiformes - Amiidae
Amiidae indet. Huxley 1861 bowfin
 Lepisosteiformes - Lepisosteidae
Lepisosteus sp. Agassiz 1843 gar
 Coelacanthiformes - Latimeriidae
Megalocoelacanthus dobiei2 Schwimmer et al. 1994 coelacanth
 Testudines - Cheloniidae
Cheloniidae indet. Bonaparte 1832 sea turtle
 Testudines - Bothremydidae
"Bothremys barberi" = Chedighaii barberi
"Bothremys barberi" = Chedighaii barberi Schmidt 1940 sideneck turtle
CSU-SSK-81-7-1, neural bone; CSU-BRK-83-1-2, costals 1 and 2; CSU-K-85-7-4, right otic chamber and basisphenoid, identification confirmed in Gaffney et al. (2006)
 Avetheropoda - Tyrannosauridae
Albertosaurus sp.3 Osborn 1905 Alberta lizard
 Avetheropoda - Ornithomimidae
Ornithomimidae indet.3 Marsh 1890 ornithomimid
 Neornithischia - Hadrosauridae
Hadrosaurinae indet.3 Lambe 1918 hadrosaurine
 Loricata -
"Crocodilia indet." = Crocodylia
"Crocodilia indet." = Crocodylia Owen 1842 crocodilian
 Crocodylia -
Deinosuchus rugosus1 Emmons 1858 crocodilian
Thoracosaurus neocesariensis De Kay 1842 crocodilian
 Squamata - Mosasauridae
Mosasauridae indet. Gervais 1852 mosasaur
Prognathodon sp. Dollo 1889 mosasaur
Halisaurus sp. Marsh 1869 mosasaur
Platecarpus sp. Cope 1869 mosasaur
  - Trigonodontidae
Stephanodus sp. Zittel 1883