Evidence of El Niño/La Niña–Southern Oscillation Variability in the Neogene-Pleistocene of Panama Revealed by a New Bryozoan Assemblage-Based Proxy

Okamura, Beth; O’Dea, Aaron; Taylor, Paul D.; Taylor, Anna

doi:10.5343/bms.2012.1041

Cited by 9 publications

(5 citation statements)

References 52 publications

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“…Excluding sample B, non-TDA MART was 6.6 °C and the MART observed across all samples was 6.2 °C. These values are consistent with those found by Okamura et al (2013), who reported a MART of 6.1 °C, and Jackson and O'Dea (2013), who found MARTs around 6 °C throughout the Miocene based on a bryozoan zooid size proxy. These values are also similar to the MART of 6° C found at 50 m water depth in modern upwelling TEP waters, while SWC waters have a MART of 4 °C (World Ocean Atlas2001, Conkright et al 2002, Tao et al, 2013.…”

Section: Paleoenvironmental Implications Of Isotopic Analysessupporting

confidence: 91%

Paleoecology and paleoenvironmental implications of turritelline gastropod-dominated assemblages from the Gatun Formation (Upper Miocene) of Panama

Anderson

Hendy

Johnson

et al. 2017

Palaeogeography, Palaeoclimatology, Palaeoecology

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Turritelline-dominated assemblages (TDAs) frequently occur in the middle-late Miocene Gatun Formation, and are not uncommon features in the broader fossil record. By gaining a better understanding of the paleoenvironment and taphonomic processes leading to their formation we can gain insight into the conditions in the Western Atlantic (WA) during the Miocene shoaling of the Central American Seaway, as well as the conditions which may lead to TDA formation generally. TDA and non-TDA beds within the Gatun were examined for shell orientation, sclerobiont coverage, drilling predation frequency, and peeling-repair frequency, in addition to sediment composition. The most abundant species, T. altilira, was also examined using oxygen isotopic sclerochronology to compare growth rate and conditions during the formation of TDA and non-TDA beds. Mean annual range of temperature (MART) was found to be 6.2°C, with a moderate associated negative O-C correlation. These data confirm the influence of Tropical Eastern Pacific (TEP) upwelling waters in the WA at this time. Upwelling conditions were found to be associated with all T. altilira, regardless of their source, indicating that Gatun TDAs are not the result of variation in nutrient supply. Orientation data from within a TDA, grain size, and sclerobiont coverage all suggest that TDAs in the Gatun are the result of variation in sediment supply/winnowing. T. altilira was found to live up to 3 years, growing between 50 and 60 mm in the first year of life with a subsequent decline in growth rate. We used the Theoretical Apex System and a calculated minimum number of individuals to determine location and frequency of drilling predation.

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Section: Paleoenvironmental Implications Of Isotopic Analysessupporting

confidence: 91%

Paleoecology and paleoenvironmental implications of turritelline gastropod-dominated assemblages from the Gatun Formation (Upper Miocene) of Panama

Anderson

Hendy

Johnson

et al. 2017

Palaeogeography, Palaeoclimatology, Palaeoecology

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“…It is best exposed along the Rabo de Puerco river in Armuelles, where a complete section of different fossil horizons can be crossed by walking a couple of kilometers upstream from where it intersects the road (8º 16.801'N, 82º 51.995'W) . At the base of the section you can find large boulders that still retain abundant oysters, corals and bryozoans (Okamura et al (2013)). Going up the section, you can find a wide bed of bivalve mollusks of the Pinna genus with exceptionally well-preserved specimens of this large filter mollusk ( Figure 055).…”

Section: Lexiconmentioning

confidence: 99%

Stratigraphic Lexicon: The Onshore Cenozoic Sedimentary Formations of The Republic of Panama

Leblanc¹

2021

Biosis:Biol. Syst.

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The stratigraphic knowledge of Panama was, until now, spread over hundreds of scientific/geologic publications written during the past 120 years. The construction of the Panama Canal during the early twentieth century helped galvanizing the engineering and geological disciplines to understand the tectonic, sedimentation and biodiversity of the Cenozoic Era in this part of the world. Later, few petroleum companies arrived on the scene and contributed to our knowledge of the sub-surface. The past thirty years saw a surge of studies by many institutions in areas away from the Canal, such as in Darien, Azuero Peninsula, Bocas del Toro, and the Burica Peninsula near the Costa Rica Border. Our most recent knowledge came from the widening of the Panama Canal between 2007 and 2016. It is from all these older and recent studies that the present Lexicon draws its content. It provides the historical background of all described geological units in Panama and summarizes the lithological and paleontological knowledge of each units in an easy-to-search format.

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“…Molnar (2008) suggested that differences in salinity do not of themselves require closure of the seaway connection between the oceans that might also be explained by a shift from a permanent El Niño-like state to the modern El Niño-Southern Oscillation (ENSO) state today. However, the hypothesis that the TEP experienced permanent El Niño conditions in the Pliocene (Wara et al 2005) remains unresolved (see Rickaby and Halloran 2005, von der Heydt et al 2011, Okamura et al 2013, and the question remains as to what would have caused such a large-scale shift in climatic regimes in the first place?…”

Section: Paleoceanographic Evidencementioning

confidence: 99%

Timing of the oceanographic and biological isolation of the Caribbean Sea from the tropical eastern Pacific Ocean

Jackson¹,

O’Dea²

2013

BMS

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Geological uplift along the Central American Arc began in the Eocene with extensive development of emergent terrains by the early Miocene. Nevertheless, three independent lines of evidence are consistent with abundant seawater exchange between the oceans until about 4.7-3 Ma. (1) Isotopic and sedimentary data from ocean cores demonstrate that divergence in surface salinity and deep-sea carbonate accumulation between the Caribbean and eastern Pacific did not occur until 4.7-4.2 Ma. Moreover, strong upwelling comparable to the Pacific today persisted in Caribbean shelf environments until 4.5-3.5 Ma. (2) North and South American terrestrial mammals and tropical forest bird faunas remained overwhelmingly isolated until about 3 Ma. Some birds flew across the seaway and numerous small amphibians and plants began mixing millions of years earlier as expected due to their high probability of rafting. The rarity and ambiguity of reported exceptions to these result after a century of intensive sampling strengthen the general pattern. (3) Bathyal foraminifera first separated across the developing Isthmus approximately 13 Ma but numerous mollusks and cheilostomes are known from both oceans until the Middle Pliocene. Some species now restricted to the Pacific persisted in the Caribbean until the Pleistocene, but no species known to have originated after the Early Pliocene occurs in both oceans except for dispersal by shorebirds or human introductions. Molecular clock estimates for the timing of divergence of taxa strongly support these patterns. Isolation of the Caribbean from the Pacific about 3 Ma provides a robust model system for the study of vicariance in the oceans.

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Evidence of El Niño/La Niña–Southern Oscillation Variability in the Neogene-Pleistocene of Panama Revealed by a New Bryozoan Assemblage-Based Proxy

Cited by 9 publications

References 52 publications

Paleoecology and paleoenvironmental implications of turritelline gastropod-dominated assemblages from the Gatun Formation (Upper Miocene) of Panama

Paleoecology and paleoenvironmental implications of turritelline gastropod-dominated assemblages from the Gatun Formation (Upper Miocene) of Panama

Stratigraphic Lexicon: The Onshore Cenozoic Sedimentary Formations of The Republic of Panama

Timing of the oceanographic and biological isolation of the Caribbean Sea from the tropical eastern Pacific Ocean

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