USGS 18634 - Melajo Clay, Melago River area: Late/Upper Miocene, Trinidad and Tobago
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Bivalvia
- Nuculanida
- Nuculanidae
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Adrana perprotracta
(Dall 1912)
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synonym of Adrana newcombi | ||||||||||
Bivalvia
- Pectinida
- Anomiidae
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Anomia simplex
d'Orbigny 1845
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Bivalvia
- Pectinida
- Pectinidae
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Pecten (Pecten) archon
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Aequipecten (Plagioctenium) demiurgus
Dall 1898
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recombined as Argopecten demiurgus | ||||||||||
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
- Carditida
- Crassatellidae
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Eucrassatella trinitaria
(Maury 1925)
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recombined as Eucrassatella (Hybolophus) trinitaria | ||||||||||
Bivalvia
- Cardiida
- Cardiidae
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Trigoniocardia (Trigoniocardia) melajoensis
Jung 1969
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recombined as Trigoniocardia (Goniacardia) melajoensis | ||||||||||
Trigoniocardia (Trigoniocardia) maturensis
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Bivalvia
- Cardiida
- Solecurtidae
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Tagelus (? Mesopleura) mansfieldi
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Bivalvia
- Cardiida
- Tellinidae
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Eurytellina melajoensis
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spelled with current rank as Tellina (Eurytellina) | ||||||||||
Macoma (Psammacoma) informal sp. A
(Dall 1900)
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Apolymetis trinitaria
(Dall 1900)
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recombined as Florimetis trinitaria | ||||||||||
Bivalvia
- Cardiida
- Veneridae
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Dosinia (Dosinia) grandis
Nelson 1870
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synonym of Dosinia ponderosa | ||||||||||
Chione (Lirophora) caroniana
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original and current combination Lirophora | ||||||||||
Macrocallista maculata
(Linnaeus 1758)
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Pleiorytis caroniana
(Maury 1925)
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Bivalvia
- Pholadida
- Corbulidae
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Notocorbula islatrinitatis
(Maury 1925)
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recombined as Varicorbula islatrinitatis | ||||||||||
Caryocorbula (Caryocorbula) helanae
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Scaphopoda
- Dentaliida
- Dentaliidae
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Dentalium (Dentalium) divulgatum
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Gastropoda
- Heterostropha
- Architectonicidae
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Architectonica (Architectonica) nobilis
(Röding 1798)
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original and current combination Architectonica nobilis | ||||||||||
Subspecies: A. (A.) nobilis nobilis | ||||||||||
Gastropoda
- Neotaenioglossa
- Calyptraeidae
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Crepidula plana
Say 1822
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Gastropoda
- Neogastropoda
- Marginellidae
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Volvarina informal sp. A
(Hinds 1844)
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Prunum (Egouena) calypsonis
(Maury 1925)
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Prunum (Egouena) springvalensis
(Maury 1925)
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Gastropoda
- Neogastropoda
- Muricidae
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Thais (Stramonita) informal sp. A
(Schumacher 1817)
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original and current combination Stramonita | ||||||||||
Murex (Phyllonotus) cf. pomum
(Gmelin 1791)
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recombined as Chicoreus (Phyllonotus) pomum | ||||||||||
Murex (Chicoreus) cf. brevifrons
(Lamarck 1822)
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= Chicoreus (Triplex) cornurectus
Guppy 1876
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Landau and Marques da Silva 2010 | |||||||||
Murex (Murex) chrysostoma
Sowerby 1834
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recombined as Vokesimurex chrysostoma | ||||||||||
Gastropoda
- Neogastropoda
- Cystiscidae
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Persicula (Rabicea) couviana
(Maury 1925)
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synonym of Persicula propeobesa | ||||||||||
Gastropoda
- Neogastropoda
- Cancellariidae
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Trigonostoma (Emmonsella) sp.
Olsson and Petit 1964
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synonym of Ventrilia | ||||||||||
Cancellaria cf. sanctifrancisci
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Cancellaria (Charcolleria) sp.
Olsson 1942
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synonym of Massyla | ||||||||||
Cancellaria (Euclia) montserratensis
(Maury 1925)
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recombined as Euclia montserratensis | ||||||||||
Gastropoda
- Neogastropoda
- Olividae
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Oliva (Oliva) couvana
Maury 1925
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Gastropoda
- Neogastropoda
- Ancillariidae
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Ancilla (Eburna) caroniana
(Maury 1925)
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recombined as Eburna caroniana | ||||||||||
Gastropoda
- Neogastropoda
- Conidae
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Conus springvalensis
Mansfield 1925
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recombined as Conus imitator springvalensis | ||||||||||
Conus couvaensis
Vokes 1938
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Gastropoda
- Neogastropoda
- Terebridae
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Strioterebrum cf. gatunense
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Gastropoda
- Neogastropoda
- Nassariidae
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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 | |||||||||
Nassarius (Uzita) informal sp. A
(Adams and Adams 1853)
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Gastropoda
- Neogastropoda
- Columbellidae
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Strombina melajoensis
Jung 1969
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recombined as Sincola (Dorsina) melajoensis | ||||||||||
Parametaria prototyphus
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Gastropoda
- Neogastropoda
- Buccinidae
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Cantharus sp.
Röding 1798
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Hanetia semiglobosa
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Gastropoda
- Neogastropoda
- Fasciolariidae
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Fusinus sp.
Rafinesque 1815
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Latirus (Polygona) cf. infundibulum
(Gmelin 1791)
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Gastropoda
- Bursidae
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Bursa (Bursa) aff. thomae
(d'Orbigny 1841)
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synonym of Bursa rhodostoma | ||||||||||
Gastropoda
- Ranellidae
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Cymatium sp.
Röding 1798
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Gastropoda
- Vermetidae
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Petaloconchus sculpturatus
Lea 1846
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Subspecies: P. sculpturatus alcimus | ||||||||||
Gastropoda
- Naticidae
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Natica (Naticarius) canrena
(Linnaeus 1758)
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recombined as Naticarius canrena | ||||||||||
Natica (Naticarius) aff. canrena
(Linnaeus 1758)
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recombined as Naticarius canrena | ||||||||||
Polinices stanislasmeunieri
Maury 1917
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Gastropoda
- Eulimidae
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Balcis egregia
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Gastropoda
- Turritellidae
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Springvaleia leroyi
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Turritella (Broderiptella) plaigyrata
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Gastropoda
- Trochidae
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Calliostoma caronianum
Maury 1925
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recombined as Calliostoma (Calliostoma) caronianum | ||||||||||
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. Collection is derived from the basal limestone |
Lithology and environment
Primary lithology: | shelly/skeletal poorly lithified conglomeratic "limestone" |
Includes fossils? | Y |
Lithology description: Limestone with large mollusks, that graded out of a conglomerate. | |
Environment: | shallow subtidal indet. |
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 basal assemblage, a carbonate and shallow water environment and is hence assigned to a carbontae - shallow subtidal 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: | 60637 | ||
Authorizer: | A. Hendy | Enterer: | A. Hendy |
Modifier: | A. Hendy | Research group: | marine invertebrate |
Subset of collection #: | 60408 | ||
Created: | 2006-05-19 08:23:10 | Last modified: | 2013-11-25 13:37:23 |
Access level: | the public | Released: | 2006-05-19 08:23:10 |
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:
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] |