USGS 18399 - Melajo Clay, Melago River area: Late/Upper Miocene, Trinidad and Tobago
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Gastropoda
- Trochidae
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Calliostoma olssoni
(Maury 1925)
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recombined as Calliostoma (Elmerlinia) olssoni | ||||||||||
Gastropoda
- Epitoniidae
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Epitonium (Epitonium) aff. foliaceicostatum
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Epitonium (Asperiscala) rohri
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Gastropoda
- Eulimidae
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Niso grandis
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Gastropoda
- Neotaenioglossa
- Calyptraeidae
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Crepidula plana
Say 1822
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Calyptraea centralis
(Conrad 1841)
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Gastropoda
- Cerithiidae
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Cerithium harrisi
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Gastropoda
- Turritellidae
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Turritella (Broderiptella) aff. mimetes
(Brown and Pilsbry 1911)
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Turritella (Broderiptella) planigyrata
(Guppy 1867)
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Turritella (Broderiptella) bifastigata
(Nelson 1870)
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Subspecies: T. (B.) bifastigata cartagenensis | ||||||||||
Gastropoda
- Pseudomelaniidae
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Miraclathurella ralla
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Carinodrillia meraca
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Gastropoda
- Neogastropoda
- Olividae
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Olivella (Minioliva) fundarugata
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Gastropoda
- Neogastropoda
- Buccinidae
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Strombinophos perdoctus
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Gastropoda
- Neogastropoda
- Nassariidae
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Nassarius (Uzita) trinitatensis
Jung 1969
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Calophos rohri
(Rutsch 1942)
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= Gordanops baranoanus
Anderson 1929
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Landau and Marques da Silva 2010 | |||||||||
Gastropoda
- Neogastropoda
- Columbellidae
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Anachis (Costoanachis) obesa
(Adams 1845)
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recombined as Parvanachis obesa | ||||||||||
Strombina (Sincola) crassilabrum
(Guppy 1874)
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Jung 1989 | 2 specimens | ||||||||
recombined as Sincola (Sincola) crassilabrum | ||||||||||
Gastropoda
- Neogastropoda
- Mangeliidae
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Ithycythara hilaris
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Gastropoda
- Neogastropoda
- Turridae
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Polystira informal sp. B
Woodring 1928
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Gastropoda
- Neogastropoda
- Muricidae
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? Calotrophon hutchisoni
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Eupleura lehneri
Jung 1969
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Gastropoda
- Naticidae
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Polinices stanislasmeunieri
Maury 1917
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Natica (Naticarius) aff. canrena
(Linnaeus 1758)
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recombined as Naticarius canrena | ||||||||||
Gastropoda
- Tornidae
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Cochliolepis pluscula
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Teinostoma (Aepystoma) caroniense
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Teinostoma (Aepystoma) melajoensis
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Teinostoma (Pseudorotella) nugax
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Teinostoma (Pseudorotella) spretum
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Gastropoda
- Caecidae
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Caecum informal sp. A
Fleming 1813
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Caecum informal sp. B
Fleming 1813
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Caecum informal sp. C
Fleming 1813
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Gastropoda
- Vitrinellidae
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Cyclostremiscus (Ponocyclus) pentagonus
(Gabb 1873)
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Gastropoda
- Heterostropha
- Acteonidae
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Rictaxis sp.
Dall 1871
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Gastropoda
- Opisthobranchia
- Cylichnidae
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Cylichnella altera
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Acteocina canaliculata
(Say 1826)
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Bivalvia
- Arcida
- Noetiidae
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Noetia (Eontia) centrota
(Guppy 1867)
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Noetia (Noetia) sheldoniana
(Maury 1912)
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Bivalvia
- Arcida
- Arcidae
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Anadara (Scapharca) placata
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original and current combination Scapharca | ||||||||||
Anadara (Anadara) inaequilateralis
(Maury 1917)
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Bivalvia
- Pectinida
- Anomiidae
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Anomia simplex
d'Orbigny 1845
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Bivalvia
- Pectinida
- Pectinidae
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Aequipecten (Plagioctenium) cf. maturensis
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synonym of Argopecten | ||||||||||
Bivalvia
- Lucinida
- Lucinidae
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Lucina (Lucinisca) roigi
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Bivalvia
- Pholadida
- Corbulidae
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Caryocorbula (Caryocorbula) helenae
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Caryocorbula (Caryocorbula) sp.
Gardner 1926
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Notocorbula sp.
Iredale 1930
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spelled with current rank as Corbula (Notocorbula) | ||||||||||
Bivalvia
- Cardiida
- Veneridae
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Pitar (Lamelliconcha) circinatus
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Pitar (Lamelliconcha) labreanus
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Chione (Lirophora) caroniana
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original and current combination Lirophora | ||||||||||
Dosinia (Dosinia) grandis
Nelson 1870
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synonym of Dosinia ponderosa | ||||||||||
Dosinia (Dosinia) sp.
Scopoli 1777
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Bivalvia
- Cardiida
- Cardiidae
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Trigoniocardia (Trigoniocardia) maturensis
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Trachycardium (Dallocardia) sanctidavidis
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spelled with current rank as Dallocardia | ||||||||||
Bivalvia
- Cardiida
- Tellinidae
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Merisca trinidadensis
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Temnoconcha aff. brasiliana
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Tellidora sp.
Morch 1856
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Eurytellina melajoensis
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spelled with current rank as Tellina (Eurytellina) | ||||||||||
? Eurytellina oligoscissulata
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spelled with current rank as Tellina (Eurytellina) | ||||||||||
Moerella (Moerella) elinguis
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spelled with current rank as Tellina (Moerella) | ||||||||||
Bivalvia
- Cardiida
- Semelidae
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Semele laevis
(Sowerby 1833)
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Subspecies: Semele laevis costaricensis | ||||||||||
Semele aff. anteriocosta
Vokes 1938
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Bivalvia
- Carditida
- Crassatellidae
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Crassinella guppyi
(Dall 1896)
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Bivalvia
- Nuculanida
- Nuculanidae
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Calorhadia (Calorhadia) solivaga
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Nuculana (Saccella) ludificans
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original and current combination Saccella | ||||||||||
Adrana perprotracta
(Dall 1912)
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synonym of Adrana newcombi | ||||||||||
Scaphopoda
- Dentaliida
- Dentaliidae
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Dentalium (Dentalium) divulgatum
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see common names |
Geography
Country: | Trinidad and Tobago |
Coordinates: | 10.6° North, 61.1° West (view map) |
Paleocoordinates: | 10.5° North, 59.6° West |
Basis of coordinate: | based on nearby landmark |
Geographic resolution: | outcrop |
Time
Period: | Neogene | Epoch: | Miocene |
10 m.y. bin: | Cenozoic 6 | ||
Key time interval: | Late/Upper Miocene | ||
Age range of interval: | 11.60800 - 5.33300 m.y. ago |
Stratigraphy
Formation: | Springvale | Member: | Melajo Clay | ||
Regional section: | Melajo River | ||||
Stratigraphic resolution: | bed | ||||
Stratigraphy comments: The Melajo Clay Member of the Springvale Formation is correlated with the Savaneta Glaconitic Sandstone Member of the Springvale Formation, although part of it may be younger. The Melajo fauna is late Miocene in age. The Melajo Clay rests transgressively on the phyllites of the Northern Range with a basal conglomerate of about 1 m thickness. The conglomerate graes into a 1.5 m thick limestone, which is overlain by a bed of sand of about 1 m thickness. Above the sand is the Melajo Clay. The total thickness of the Melajo Clay is about 200 ft. It is unconformably overlain by Pleistocene sand and gravel deposits. |
Lithology and environment
Primary lithology: | yellow,blue unlithified silty claystone |
Secondary lithology: | coarse unlithified sandstone |
Includes fossils? | Y |
Lithology description: Blue, yellowish weatheirng clay and silty clay with occasional sandy layers. Sand is probably coarse. | |
Environment: | offshore |
Geology comments: The Melajo fauna can be divided into two assemblages: one occurring the limestone and coarse sand near the base of the Melajo Clay, the other on in the overlying clay and silty clay. The difference of the two assemblages is facies controlled. The basal assemblage represents a typical, tropical, near-shore fauna, whereas the overlying assemblage points to a deeper environment. This collection is derived from the clay assemblage, a siliciclastic and deeper water environment and is hence assigned to a siliciclastic - offshore environment. |
Taphonomy
Modes of preservation: | body |
Size of fossils: | macrofossils |
Preservation of anatomical detail: | good |
Collection methods and comments
Collection excludes: | some macrofossils,some microfossils |
Collection methods: | selective quarrying,field collection |
Reason for describing collection: | taxonomic analysis |
Museum repositories: | PRI,USNM |
Collection method comments: All material descibed in this report is reposited in the Naturhistorisches Mueum, Basel, or the USNM. Additional material collection from this unit is found at PRI. | |
Taxonomic list comments:Exhaustive for Mollusca, although author suggests that further collection would reveal additional forms. Corals, bryozoa and spines of echinoderms also exists in the unit, though are not listed. Van de Bold (1963) also lists ostracords from several localities. Foraminiferal assemblages are also listed in unpublished reports by Saunders. |
Metadata
Database number: | 60399 | ||
Authorizer: | A. Hendy | Enterer: | A. Hendy |
Modifier: | A. Hendy | Research group: | marine invertebrate |
Collections that are a subset of this one: | |||
Created: | 2006-05-14 12:31:15 | Last modified: | 2013-11-25 13:37:23 |
Access level: | the public | Released: | 2006-05-14 12:31:15 |
Creative Commons license: | CC BY |
Reference information
Primary reference:
17317. | P. Jung. 1969. Miocene and Pliocene mollusks from Trinidad. Bulletins of American Paleontology 55(247):293-697 [A. Miller/A. Hendy] |
Secondary references:
26828 | P. Jung. 1989. Revision of the Strombina-group (Gastropoda; Columbellidae), fossil and living. Schweierische Paläontologische Abhandlungen 111:1-298 [A. Hendy/A. Hendy/A. Hendy] | |
36423 | B. Landau and C. Marques da Silva. 2010. Early Pliocene gastropods of Cubagua, Venezuela: Taxonomy, palaeobiogeography and ecostratigraphy. Palaeontos 19:1-221 [A. Hendy/A. Hendy] |