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Contents

   



(Top)
 


1 Subdivision  





2 Fossil content  





3 See also  





4 References  



4.1  Bibliography  







5 Further reading  














Onzole Formation







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Coordinates: 1°00N 79°36W / 1.0°N 79.6°W / 1.0; -79.6
 

From Wikipedia, the free encyclopedia
 


Onzole Formation
Stratigraphic range: Early Pliocene
(Montehermosan-Chapadmalalan)
~5.3–3.6 Ma

O

S

D

C

P

T

J

K

Pg

N

TypeGeological formation
Unit ofDaule Group
Sub-unitsSúa & Esmeraldas Members
OverliesAngostura Formation
Lithology
PrimaryShale
OtherMudstone
Location
Coordinates1°00′N 79°36′W / 1.0°N 79.6°W / 1.0; -79.6
Approximate paleocoordinates0°48′N 78°48′W / 0.8°N 78.8°W / 0.8; -78.8
RegionEsmeraldas Province
Country Ecuador
ExtentBorbón Basin
Type section
Named forOnzole River
Onzole Formation is located in Ecuador
Onzole Formation

Onzole Formation (Ecuador)

The Onzole Formation is an Early Pliocene (MontehermosantoChapadmalalan in the SALMA classification) geologic formation in the Borbón Basin of northwestern Ecuador. The formation consists of a shallow marine sandstone member containing many fish fossils, among which megalodon, and a deep water member comprising tuffaceous shales and mudstones containing gastropods, bivalves and scaphopods.[1][2]

Subdivision[edit]

The formation consists of the Esmeraldas Member, which is a unit comprising highly foraminiferal tuffaceous calcareous shale. They were deposited by shallow water gravity flows, which brought the Esmeraldas fauna into the deep water (1,000 metres (3,300 ft)) from shallow water, on the order of 75 metres (246 ft).[3]

The Esmeraldas Member is covered by the Súa Member comprising burrowed, bioturbated, silty sandstones deposited in a coastal environment.

Fossil content[edit]

The formation has provided bivalve, gastropod, and scaphopod fossils and the following vertebrates:[4][5][6]

  • Carcharocles megalodon
  • Diaphus ecuadorensis[7]
  • Galeocerdo aduncus
  • Hemipristis serra
  • Isistius triangulus
  • Negaprion eurybathrodon
  • Odontaspis acutissima
  • Rhizoprionodon taxandriae
  • Brotula cf. ordwayi
  • Chilara taylori
  • Eucinostomus cf. currani
  • Larimus cf. pacificus
  • Lepophidium borbonensis, L. limulum[8]
  • Lepophidium microlepis
  • Merluccius cf. angustimanus
  • Orthopristis cf. cantharinus
  • Otophidium indefatigabile
  • Paraconger californiensis
  • Porichthys analis, Porichthys margaritatus, Porichthys cf. notatus
  • Stellifer onzole[9]
  • Anchoa sp.
  • Apogon sp.
  • Citharichthys sp.
  • Diaphus sp.
  • Haemulon sp.
  • Lampadena sp.
  • Apogonidae indet.
  • Cynoglossidae indet.
  • Gobiidae indet.
  • Gerreidae indet.
  • Opistognathidae indet.
  • Pleuronectidae indet.
  • ?Serranidae indet.
  • See also[edit]

    References[edit]

  • ^ Onozole (sic) FormationatFossilworks.org
  • ^ Esmeraldas BedsatFossilworks.org
  • ^ Súa Member, Onzole FormationatFossilworks.org
  • ^ Punta La GordaatFossilworks.org
  • ^ Punta la ColoradaatFossilworks.org
  • ^ Schwarzhans & Aguilera, 2013
  • ^ Schwarzhans & Aguilera, 2016
  • ^ Aguilera et al., 2016
  • Bibliography[edit]

    Further reading[edit]


    Retrieved from "https://en.wikipedia.org/w/index.php?title=Onzole_Formation&oldid=1233409194"

    Categories: 
    Geologic formations of Ecuador
    Pliocene Series of South America
    Neogene Ecuador
    Chapadmalalan
    Montehermosan
    Shale formations
    Mudstone formations
    Sandstone formations
    Deep marine deposits
    Shallow marine deposits
    Paleontology in Ecuador
    Geography of Esmeraldas Province
    Hidden categories: 
    Pages using gadget WikiMiniAtlas
    Coordinates on Wikidata
     



    This page was last edited on 8 July 2024, at 22:27 (UTC).

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