PJ 285 - Melajo Clay, Melago River area: Late/Upper Miocene, Trinidad and Tobago
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Scaphopoda
- Dentaliida
- Dentaliidae
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Dentalium (Dentalium) divulgatum
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Gastropoda
- Epitoniidae
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Epitonium (Asperiscala) rohri
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Epitonium (Epitonium) aff. foliaceiscostatum
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Gastropoda
- Eulimidae
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Niso grandis
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Eulima informal sp. A
Risso 1826
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Gastropoda
- Neotaenioglossa
- Calyptraeidae
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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) planigyrata
(Guppy 1867)
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Turritella (Broderiptella) aff. mimetes
(Brown and Pilsbry 1911)
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Gastropoda
- Pseudomelaniidae
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Carinodrillia meraca
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Miraclathurella ralla
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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
- Neogastropoda
- Olividae
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Olivella (Minioliva) fundarugata
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Olivella (Dactylidia) mutica
(Say 1822)
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recombined as Olivella mutica | |||||||
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 | |||||||
Anachis (Costoanachis) fraudans
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Gastropoda
- Neogastropoda
- Volutidae
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Bullata maiae
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spelled with current rank as Closia (Bullata) | |||||||
Gastropoda
- Neogastropoda
- Muricidae
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Eupleura lehneri
Jung 1969
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Calotrophon hutchisoni
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Gastropoda
- Neogastropoda
- Terebridae
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Strioterebrum cf. baculiforme
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Strioterebrum aff. laevifasciola
(Maury 1917)
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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
- Drilliidae
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Agladrillia lassula
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Crassispira (Crassispira) cf. caroniana
(Maury 1925)
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recombined as Hindsiclava caroniana | |||||||
Gastropoda
- Vitrinellidae
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Cyclostremiscus (Ponocyclus) pentagonus
(Gabb 1873)
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Gastropoda
- Tornidae
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Teinostoma (Aepystoma) caroniense
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Teinostoma (Aepystoma) melajoense
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Teinostoma (Pseudorotella) nugax
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Teinostoma (Pseudorotella) spretum
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Cochliolepis pluscula
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Gastropoda
- Heterostropha
- Pyramidellidae
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Turbonilla informal sp. A
Risso 1826
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Turbonilla informal sp. B
Risso 1826
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Turbonilla informal sp. D
Risso 1826
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Pyramidella (Callolongchaeus) aff. jamaicensis
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Pyramidella (Callolongchaeus) cf. daidemata
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Eulimella (Ebalina) mitis
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Gastropoda
- Heterostropha
- Architectonicidae
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Architectonica (Pseudotorinia) melajoensis
Jung 1969
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Gastropoda
- Heterostropha
- Acteonidae
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Rictaxis sp.
Dall 1871
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Gastropoda
- Trochidae
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Calliostoma olssoni
(Maury 1925)
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recombined as Calliostoma (Elmerlinia) olssoni | |||||||
Calliostoma decipiens
(Guppy 1867)
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recombined as Calliostoma (Calliostoma) decipiens | |||||||
Gastropoda
- Opisthobranchia
- Retusidae
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Sulcoretusa aff. sulcata
(d'Orbigny 1841)
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Rhizorus informal sp. B
Montfort 1810
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Gastropoda
- Opisthobranchia
- Cylichnidae
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Acteocina canaliculata
(Say 1826)
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Cylichnella altera
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Gastropoda
- Neritidae
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Neritina (Vitta) cf. virginia
(Linnaeus 1758)
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recombined as Neritina virginea | |||||||
Bivalvia
- Nuculanida
- Nuculanidae
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Calorhadia (Calorhadia) solivaga
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Adrana perprotracta
(Dall 1912)
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synonym of Adrana newcombi | |||||||
Nuculana (Saccella) ludificans
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original and current combination Saccella | |||||||
Bivalvia
- Solenida
- Solenidae
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Solen (Solen) sp.
Linnaeus 1758
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Bivalvia
- Pholadida
- Corbulidae
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Juliacorbula aequivalvis
(Philippi 1836)
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Notocorbula sp.
Iredale 1930
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spelled with current rank as Corbula (Notocorbula) | |||||||
Tenuicorbula melajoensis
(Jung 1969)
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Caryocorbula (Caryocorbula) helenae
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Caryocorbula (Caryocorbula) sp.
Gardner 1926
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Bivalvia
- Cardiida
- Veneridae
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Pitar (Lamelliconcha) circinatus
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Chione (Lirophora) caroniana
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original and current combination Lirophora | |||||||
Dosinia (Dosinia) sp.
Scopoli 1777
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Bivalvia
- Cardiida
- Tellinidae
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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) | |||||||
Merisca trinidadensis
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Bivalvia
- Cardiida
- Cardiidae
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Trigoniocardia (Trigoniocardia) maturensis
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Bivalvia
- Lucinida
- Lucinidae
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Lucina (Lucinisca) roigi
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Bivalvia
- Carditida
- Crassatellidae
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Crassinella guppyi
(Dall 1896)
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Bivalvia
- Pectinida
- Pectinidae
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Aequipecten (Plagioctenium) cf. maturensis
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synonym of Argopecten | |||||||
Bivalvia
- Pectinida
- Anomiidae
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Anomia simplex
d'Orbigny 1845
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Bivalvia
- Ostreida
- Pinnidae
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Atrina sp.
Gray 1842
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Bivalvia
- Arcida
- Arcidae
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Anadara (Anadara) inaequilateralis
(Maury 1917)
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Anadara (Scapharca) placata
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original and current combination Scapharca | |||||||
Bivalvia
- Arcida
- Noetiidae
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Arcopsis adamsi
(Dall 1886)
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Noetia (Eontia) centrota
(Guppy 1867)
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Noetia (Noetia) sheldoniana
(Maury 1912)
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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: | 11.63000 - 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: | 60634 | ||
Authorizer: | A. Hendy | Enterer: | A. Hendy |
Modifier: | A. Hendy | Research group: | marine invertebrate |
Subset of collection #: | 60399 | ||
Created: | 2006-05-19 08:18:08 | Last modified: | 2013-11-25 13:37:23 |
Access level: | the public | Released: | 2006-05-19 08:18:08 |
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] |