USGS 18411 - Melajo Clay, Melago River area: Late Miocene, Trinidad and Tobago
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Bivalvia
- Cardiida
- Semelidae
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Bivalvia
- Pectinida
- Pectinidae
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Aequipecten (Plagioctenium) demiurgus
Dall 1898
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Bivalvia
- Arcida
- Arcidae
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Barbatia sp.
Gray 1842
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Bivalvia
- Pholadida
- Corbulidae
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Notocorbula islatrinitatis
(Maury 1925)
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Bivalvia
- Cardiida
- Cardiidae
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Bivalvia
- Cardiida
- Tellinidae
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Apolymetis trinitaria
(Dall 1900)
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Bivalvia
- Cardiida
- Semelidae
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Bivalvia
- Cardiida
- Solecurtidae
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Bivalvia
- Cardiida
- Veneridae
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Macrocallista maculata
(Linnaeus 1758)
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Bivalvia
- Carditida
- Crassatellidae
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Eucrassatella trinitaria
(Maury 1925)
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Gastropoda
- Heterostropha
- Pyramidellidae
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Gastropoda
- Heterostropha
- Mathildidae
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Gastropoda
- Eulimidae
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Gastropoda
- Neotaenioglossa
- Calyptraeidae
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Calyptraea centralis
(Conrad 1841)
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Gastropoda
- Naticidae
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Natica (Naticarius) canrena
(Linnaeus 1758)
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Gastropoda
- Vermetidae
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Gastropoda
- Neogastropoda
- Conidae
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Conus springvalensis
Mansfield 1925
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Gastropoda
- Neogastropoda
- Costellariidae
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Conomitra sp.
Conrad 1865
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Gastropoda
- Neogastropoda
- Cancellariidae
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Gastropoda
- Neogastropoda
- Marginellidae
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Prunum (Egouena) springvalensis
(Maury 1925)
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Prunum (Egouena) calypsonis
(Maury 1925)
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Gastropoda
- Neogastropoda
- Muricidae
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Murex (Murex) chrysostoma
Sowerby 1834
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Gastropoda
- Neogastropoda
- Cystiscidae
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Persicula (Rabicea) couviana
(Maury 1925)
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Gastropoda
- Neogastropoda
- Fasciolariidae
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Fusinus sp.
Rafinesque 1815
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Gastropoda
- Neogastropoda
- Nassariidae
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Gastropoda
- Neogastropoda
- Buccinidae
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Colubraria sp.
Schumacher 1817
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Gastropoda
- Neogastropoda
- Olividae
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Oliva (Oliva) couvana
Maury 1925
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Gastropoda
- Neogastropoda
- Ancillariidae
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Ancilla (Euburna) caroniana
Maury 1925
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Gastropoda
- Turritellidae
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Turritella (Broderiptella) planigyrata
(Guppy 1867)
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Gastropoda
- Trochidae
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Calliostoma decipiens
(Guppy 1867)
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see common names |
Geography
Country: | Trinidad and Tobago |
Coordinates: | 10.6° North, 61.1° West (view map) |
Paleocoordinates: | 10.8° North, 58.5° West (Wright 2013) |
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 Miocene | ||
Age range of interval: | 11.63 - 5.333 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: | 60408 | ||
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 12:52:13 | Last modified: | 2025-02-22 15:12:02 |
Access level: | the public | Released: | 2006-05-14 12:52:13 |
Creative Commons license: | CC0 |
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] |