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
 Nuculida - Nuculidae
Nucula sp. Lamarck 1799 nut clam
 Nuculanida - Yoldiidae
Yoldia sp. Möller 1842 clam
 Nuculanida - Nuculanidae
Nuculana sp. Link 1807 pointed nut clam
Calorhadia reginajacksonis2 pointed nut clam
 Carditida - Carditidae
"Venericardia diversidentata" = Venericardia (Rotundicardia) diversidentata Meyer 1885 clam
 Carditida - Astartidae
Lirodiscus sp. Conrad 1869 clam
 Thraciida - Periplomatidae
Periploma sp. Schumacher 1816 clam
 Poromyida - Spheniopsidae
 Pholadida - Corbulidae
 Cardiida - Veneridae
Pitar securiformis Conrad 1865 venus clam
 Cardiida - Kelliellidae
 Cardiida - Cardiidae
Nemocardium nicolletti Conrad 1854 cockle
 Lucinida - Lucinidae
 Mytilida - Mytilidae
? Modiolus sp. Lamarck 1801 mussel
 Ostreida - Pinnidae
Atrina sp. Gray 1842 oyster
 Ostreida - Ostreidae
 Pectinida - Pectinoidae
 Arcida - Arcidae
 Arcida - Limopsidae
Limopsis sp. Sassi 1827 clam
Belosaepia sp. Voltz 1830
 Dentaliida - Dentaliidae
Dentalium sp. Linnaeus 1758 tusk shell
 Gadilida - Gadilidae
Cadulus sp. Philippi 1844 tusk shell
 Neotaenioglossa - Calyptraeidae
Calyptraea (Trochita) aperta Solander 1766 slipper shell
Calyptraea (Trochita) aperta
 Neogastropoda - Cancellariidae
Bonellitia jacksonica Cooke 1926 snail
 Neogastropoda - Mitridae
"Conomitra hammakeri" = Mitra hammakeri
"Conomitra hammakeri" = Mitra hammakeri Harris 1894 mitre shell
 Neogastropoda - Turridae
? Eopleurotoma sp. Cossmann 1889 turrid
"Coronia montgomeryensis" = Gemmula (Coronia) turrid
Coronia conjuncta Casey 1904 turrid
Coronia nodulina Casey 1904 turrid
Coronia nodulina ouachitensis
Pleurofusia danvicola Harris 1937 turrid
Infracoronia ludoviciana Harris and Palmer 1947 turrid
Infracoronia ludoviciana normani
Sinistrella americana Aldrich 1885 turrid
 Neogastropoda - Drilliidae
Cymatosyrinx palmerae Harris and Palmer 1947 snail
 Neogastropoda - Borsoniidae
Pseudotoma heilprini Aldrich 1885 snail
Cordieria ludoviciana Vaughn 1896 snail
Asthenotoma danvitexa Harris and Palmer 1947 snail
 Neogastropoda - Cochlespiridae
"? Eodrillia sp." = Tropisurcula (Eodrillia) Casey 1904 snail
Cochlespira bella Harris 1937 snail
Cochlespira bella polita
 Neogastropoda - Clavatulidae
Turricula plutonica Casey 1903 snail
Turricula plutonica weisbordi
 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 - Buccinidae
Cantharus sp. Röding 1798 true whelk
Pseudoliva vetusta Conrad 1833 true whelk
Pseudoliva vestuta perspectiva
"Tritiaria albirupina" = Phos albirupina Harris 1894 true whelk
Siphonalia sullivani Harris and Palmer 1947 true whelk
Siphonalia sullivani ouachitae
 Neogastropoda - Melongenidae
 Neogastropoda - Costellariidae
Pyramimitra ? terebraeformis Conrad 1848 ribbed mitre
 Neogastropoda - Volutidae
Caricella howei Harris and Palmer 1947 volute
Bullata semen Lea 1833 volute
Bullata semen jacksonensis
Athleta sp. Conrad 1853 volute
 Neogastropoda - Muricidae
Hexaplex (Hexaplex) supernus Harris and Palmer 1947 murex snail
Hexaplex (Hexaplex) supernus
 Sorbeoconcha - Rissoidae
? Ottoina sp. Harris and Palmer 1947 snail
 Sorbeoconcha - Tornidae
"Teinostoma (Idioraphe) verrilli" = Teinostoma (Idioraphie)
"Teinostoma (Idioraphe) verrilli" = Teinostoma (Idioraphie) snail
T. (Idioraphe) verrilli
 Sorbeoconcha - Naticidae
Natica permunda Conrad 1854 moon snail
 Epitonioidea - Epitoniidae
Cirsotrema (Coroniscala) danvillense Harris and Palmer 1947 wentletrap
Cirsotrema (Coroniscala) danvillense
 Vanikoroidea - Eulimidae
Melanella jacksonensis de Gregorio 1890 snail
 Cerithioidea - Acanthonematidae
Bittium koeneni cerith snail
Turritella sp. Lamarck 1799 turret shell
Turritella perdita Conrad 1865 turret shell
Turritella perdita jacksonensis
"Turritella arenicola" = Kapalmerella arenicola Conrad 1865 turret shell
Turritella arenicola danvillensis
 Thecosomata - Limacinidae
Limacina sp. Bosc 1817 snail
 Thecosomata -
 Opisthobranchia - Cylichnidae
Abderospira oviformis Meyer 1886 snail
Scaphander ? jacksonensis Harris and Palmer 1947 snail
 Opisthobranchia - Scaphandridae
Mnestia meyeri Cossmann 1893 snail
 Opisthobranchia - Retusidae
Retusa (Cylichnina) jacksonensis snail
Retusa (Cylichnina) jacksonensis
 Heterostropha - Pyramidellidae
Odostomia jacksonensis, "Turbonilla (Strioturbonilla) major" = Turbonilla major, Pyramidella bastropensis, "Pyramidella (Syrnola) meyeri" = Syrnola meyeri
"Turbonilla (Strioturbonilla) major" = Turbonilla major Meyer 1887 snail
Turbonilla (Strioturbonilla) major
"Pyramidella (Syrnola) meyeri" = Syrnola meyeri Cossmann 1893 snail
Pyramidella (Syrnola) meyeri
 Heterostropha - Architectonicidae
Architectonica (Architectonica) bellistriata Conrad 1854 sundial
Architectonica (Architectonica) bellistriata
Architectonica (Granosolarium) meekana Harris and Palmer 1947 sundial
Architectonica (Granosolarium) meekana subsplendida
 Heterostropha - Ringiculidae
Ringicula sp. Deshayes 1838 snail
 Heterostropha - Acteonidae
Acteon annectens Meyer 1885 snail
? Tornatellaea lata Conrad 1834 snail
 Heterostropha - Mathildidae
Mathilda regularis Meyer 1886 snail
 Cetacea - Basilosauridae
Cynthiacetus maxwelli n. gen. n. sp.3
Cynthiacetus maxwelli n. gen. n. sp.3 Uhen 2005 whale
 Squamata - Palaeophiidae
Pterosphenus schucherti1 Lucas 1898 snake
"Niso umbilicata" = Pasithea umbilicata
"Niso umbilicata" = Pasithea umbilicata Lea 1833