Vaingana, Eua Island (Eocene of Tonga)

Where: Tonga (21.4° S, 174.9° W: paleocoordinates 31.1° S, 175.8° W)

• coordinate estimated from map

• small collection-level geographic resolution

When: Priabonian (38.0 - 33.9 Ma)

• No lithostratigraphic nomenclature for unit mentioned in 1970 or in later publications on Western Pacific Island Cenozoic strata (i.e. Ladd (1972, 1982). The collection is derived from a soft fossiliferous layer [unknown thickness] between two harder limestones. The exact extent of the richly fossiliferous bed is not known but is probably limited both horizontally and vertically. Eua is the oldest island in the Tonga island group that has a plutonic core and a series of volcanic rocks and sediments that are partly blanketed by thick limestones of late Eocene age. Younger volcanic rocks and sediments of late Tertiary age are also present.

• bed-level stratigraphic resolution

Environment/lithology: offshore shelf; poorly lithified, tuffaceous limestone

• Foraminifera suggest a depth of deposition of about 200 ft, but other groups, notably smaller forams, mollusks, ostracods, corals, brachiopods, barnacles, point to a considerably greater depth of deposition.
• Soft tuffaceous limestone.

Size class: macrofossils

Preservation: mold/impression

Reposited in the USNM

Collection methods: bulk, chemical,

• Derived from one 40-pound sample collected by Kondo [recent land snail taxonomist under orders to find locality and collect material] in 1967

Primary reference: H. S. Ladd. 1970. Eocene Mollusks from Eua, Tonga. United States Geological Survey Professional Paper 640(C):1-12 [A. Miller/A. Hendy/A. Hendy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 43006: authorized by Austin Hendy, entered by Austin Hendy on 08.08.2004, edited by Matthew Clapham

Creative Commons license: CC BY (attribution)

Taxonomic list

• Exhaustive for mollusks. Other groups (forams, ostracods, brachiopods) are present and were studied by respective authorities though publications with this data have not been found yet.
 Pectinida - Pectinoidae
? Pecten sp. Müller 1776 scallop
 Ostreida - Ostreidae
Crassostrea sp. Sacco 1897 oyster
 Pholadida - Corbulidae
"Corbula (? Cuneocorbula) sp." = Cuneocorbula
"Corbula (? Cuneocorbula) sp." = Cuneocorbula Cossmann 1886 clam
 Ptenoglossa - Epitoniidae
Epitonium (? Boreoscala) sp. Kobelt 1905 wentletrap
 Cephalaspidea - Haminoeidae
? Atys sp. Montfort 1810 snail
 Triphoroidea - Cerithiopsidae
Cerithiopsis sp. Hanley 1849 snail
 Neogastropoda - Fasciolariidae
Latirus sp. Monfort 1810 snail
 Neogastropoda - Conidae
Conus sp. Linnaeus 1758 cone shell
 Neogastropoda - Terebridae
Hastula sp. Adams and Adams 1853 auger snail
 Naticoidea - Naticidae
? Neverita sp. Risso 1826 moon snail
 Cypraeoidea - Cypraeidae
Pedicularia (Pedicularia) sp. Swainson 1840 cowry
 Xenophoroidea - Xenophoridae
Xenophora sp. Fischer von Waldheim 1807 carrier shell
 Rissooidea - Adeorbidae
 Heterostropha - Mathildidae
"Mathilda (Fimbriatella) sp." = Fimbriatella, Gegania whipplei
"Mathilda (Fimbriatella) sp." = Fimbriatella Sacco 1895 snail
 Turbinoidea - Turbinidae
Munditiella euaensis Ladd 1970 snail
Astraea (Bolma) stearnsi Ladd 1970 snail
 Seguenzioidea - Ancistrobasidae
 Seguenzioidea - Calliotropidae
? Bathybembix sp. Crosse 1892 snail
 Seguenzioidea - Turcicidae
Turcica (Perrinia) blowi Ladd 1970 snail
 Scissurelloidea - Anatomidae
 Scissurelloidea - Scissurellidae
Sinezona kondoi Ladd 1970 snail
 Trochoidea - Trochidae
Astele (Callistele) sp. Cotton and Godfrey 1935 top snail
 Anguilliformes -
? Parechelus sp. Casier 1967 eel
 Thecideida - Thecidellinidae
 Terebratulida -
 Terebratulida - Megathyrididae
Argyrotheca anomala Cooper 1979
 Terebratulida - Terebratulidae
 Terebratulida - Cancellothyrididae
? Terebratulina sp. d'Orbigny 1847
 Terebratulida - Dyscoliidae
Aenigmathyris stearnsi n. sp. Cooper 1971