Cynthia Pit (Eocene of the United States)

Also known as Jackson Ready-Mix Concrete Company, Miss Lite Division quarry

Where: Hinds County, Mississippi (32.5° N, 90.3° W: paleocoordinates 33.1° N, 82.4° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Yazoo Formation (Jackson Group), Priabonian (38.0 - 33.9 Ma)

• upper third of Yazoo

between 15 and 45 meters from the top of the Yazoo (135 m thick), above the foram extinction level

~34.3 Ma age date from correlative bentonites

• group of beds-level stratigraphic resolution

Environment/lithology: offshore; unlithified, shelly/skeletal, gray claystone

• fossiliferous. blocky, blue gray clay

fossils interspersed throughout, with shell hash beds that become more closely spaced upsection

Size class: mesofossils

Preservation: original aragonite, original calcite

Collection methods: bulk, mechanical, sieve,

Primary reference: D. M. Haasl and T.A. Hansen. 1996. Timing of latest Eocene molluscan extinction patterns in Mississippi. Palaios 11(5):487-494 [L. Ivany/L. Ivany]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 6802: authorized by Linda Ivany, entered by Linda Ivany on 17.03.2000, edited by Mark Uhen and Jocelyn Sessa

Creative Commons license: CC BY (attribution)

Taxonomic list

• mollusks only
unclassified
  -
Bivalvia
 Arcida - Arcidae
 Arcida - Limopsidae
Limopsis sp. Sassi 1827 clam
 Pectinida - Pectinoidae
 Ostreida - Ostreidae
 Ostreida - Pinnidae
Atrina sp. Gray 1842 oyster
 Mytilida - Mytilidae
? Modiolus sp. Lamarck 1801 mussel
 Carditida - Astartidae
Lirodiscus sp. Conrad 1869 clam
 Carditida - Carditidae
"Venericardia diversidentata" = Venericardia (Rotundicardia) diversidentata Meyer 1885 clam
 Pholadida - Corbulidae
"Corbula densata" = Caryocorbula densata Conrad 1854 clam
 Cardiida - Kelliellidae
 Cardiida - Veneridae
Pitar securiformis Conrad 1865 venus clam
 Cardiida - Cardiidae
Nemocardium nicolletti Conrad 1862 cockle
 Thraciida - Periplomatidae
Periploma sp. Schumacher 1816 clam
 Poromyida - Spheniopsidae
 Lucinida - Lucinidae
 Nuculida - Nuculidae
Nucula sp. Lamarck 1799 nut clam
 Protobranchia - Nuculanidae
Calorhadia reginajacksonis2 pointed nut clam
Nuculana sp. Link 1807 pointed nut clam
 Protobranchia - Yoldiidae
Yoldia sp. Möller 1842 clam
Gastropoda
 Ptenoglossa - Epitoniidae
Cirsotrema (Coroniscala) danvillense wentletrap
Cirsotrema (Coroniscala) danvillense
 Thecosomata - Limacinidae
Limacina sp. Bosc 1817 snail
 Thecosomata -
 Cephalaspidea - Retusidae
Retusa (Cylichnina) jacksonensis snail
Retusa (Cylichnina) jacksonensis
 Cephalaspidea - Cylichnidae
 Neogastropoda - Buccinidae
Pseudoliva vetusta Conrad 1833 true whelk
Pseudoliva vestuta perspectiva
Cantharus sp. Röding 1798 true whelk
Siphonalia sullivani true whelk
Siphonalia sullivani ouachitae
 Neogastropoda - Nassariidae
"Tritiaria albirupina" = Nassarius (Tritiaria)
"Tritiaria albirupina" = Nassarius (Tritiaria) snail
 Neogastropoda - Melongenidae
 Neogastropoda - Fasciolariidae
Mazzalina inaurata Conrad 1833 snail
Mazzalina inaurata oweni
Latirus sp. Monfort 1810 snail
Tritonatractus montgomeriensis snail
[entered as Tritonoatractus montgomeriensis]
Tritonatractus pearlensis Aldrich 1885 snail
Tritonoatractus pearlensis danvillensis [entered as Tritonoatractus pearlensis]
 Neogastropoda - Cancellariidae
Bonellitia jacksonica Cooke 1926 snail
 Neogastropoda - Volutidae
Bullata semen Lea 1833 volute
Bullata semen jacksonensis
Athleta sp. Conrad 1853 volute
 Neogastropoda - Costellariidae
Conomitra hammakeri ribbed mitre
 Neogastropoda - Muricidae
Hexaplex (Hexaplex) supernus Palmer 1947 murex snail
Hexaplex (Hexaplex) supernus
 Neogastropoda - Cochlespiridae
"? Eodrillia sp." = Tropisurcula (Eodrillia) Casey 1904 snail
Cochlespira bella snail
Cochlespira bella polita
 Neogastropoda - Drilliidae
 Neogastropoda - Turridae
Sinistrella americana Aldrich 1885 turrid
Pyramimitra ? terebraeformis Conrad 1833 turrid
Turricula plutonica turrid
Turricula plutonica weisbordi
Infracoronia ludoviciana turrid
Infracoronia ludoviciana normani
Coronia nodulina Casey 1904 turrid
Coronia nodulina ouachitensis
? Eopleurotoma sp. Cossmann 1889 turrid
 Neogastropoda - Borsoniidae
 Vanikoroidea - Eulimidae
Melanella jacksonensis de Gregorio 1890 snail
Niso umbilicata Lea 1833 snail
 Naticoidea - Naticidae
Natica permunda Conrad 1854 moon snail
 Calyptraeoidea - Calyptraeidae
Calyptraea (Trochita) aperta Solander 1766 slipper shell
Calyptraea (Trochita) aperta
 Truncatelloidea - Tornidae
"Teinostoma (Idioraphe) verrilli" = Teinostoma (Idioraphie)
"Teinostoma (Idioraphe) verrilli" = Teinostoma (Idioraphie) snail
T. (Idioraphe) verrilli
 Sorbeoconcha - Turritellidae
"Turritella arenicola" = Kapalmerella arenicola, Turritella sp., "Turritella perdita" = Haustator perdita
"Turritella arenicola" = Kapalmerella arenicola Conrad 1865 turret shell
Turritella arenicola danvillensis
Turritella sp. Lamarck 1799 turret shell
"Turritella perdita" = Haustator perdita Conrad 1865 turret shell
Turritella perdita jacksonensis
 Sorbeoconcha - Cerithiidae
Bittium koeneni cerith snail
 Heterostropha - Acteonidae
? Tornatellaea lata Conrad 1834 snail
Acteon annectens Meyer 1885 snail
 Heterostropha - Ringiculidae
Ringicula sp. Deshayes 1838 snail
 Heterostropha - Mathildidae
Mathilda regularis Meyer 1886 snail
 Tectibranchia - Scaphandridae
Mnestia meyeri Cossmann 1893 snail
 Pyramidelloidea - Pyramidellidae
Pyramidella (Syrnola) meyeri Cossmann 1893 snail
Pyramidella (Syrnola) meyeri
Turbonilla (Strioturbonilla) major Meyer 1887 snail
Turbonilla (Strioturbonilla) major
 Architectonicoidea - Architectonicidae
Architectonica (Architectonica) bellistriata Conrad 1854 sundial
Architectonica (Architectonica) bellistriata
Architectonica (Granosolarium) meekana sundial
Architectonica (Granosolarium) meekana subsplendida
Scaphopoda
 Dentaliida - Dentaliidae
Dentalium sp. Linnaeus 1758 tusk shell
 Gadilida - Gadilidae
Cadulus sp. Philippi 1844 tusk shell
Cephalopoda
  -
Reptilia
 Squamata - Palaeophidae
Pterosphenus schucherti1 Lucas 1898 squamates
Mammalia
 Pelagiceti - Basilosauridae
Cynthiacetus maxwelli n. gen. n. sp.3
Cynthiacetus maxwelli n. gen. n. sp.3 Uhen 2005 whale