INVESTIGADORES
BERNASCONI emiliana
artículos
Título:
Pleistocene marine calcareous macro - and - microfossilsof NavarinoIsland (Chile) as environmental proxies during the last interglacialinsouthern South America
Autor/es:
GORDILLO SANDRA; CUSMINSKY GABRIELA; BERNASCONI EMILIANA; PONCE J. F; RABASSA JORGE; PINO M
Revista:
QUATERNARY INTERNATIONAL
Editorial:
PERGAMON-ELSEVIER SCIENCE LTD
Referencias:
Lugar: Amsterdan; Año: 2010 vol. 221 p. 159 - 174
ISSN:
1040-6182
Resumen:
Macro-and-microfossils,includingmolluscs,cirripeds,echinoids,foraminifersandostracodsarea significantcomponentofaPleistocenemarineunitlocatedalongthesoutherncoastoftheBeagleChannel,onNavarinoIsland,Chile.Thispaleontologicalrecordrepresentstherichestandmostdiversemacro-and-microassemblagerecoveredfromPleistocenesouthernSouthAmerica.Intotal,97taxawereidentified:34molluscs,57foraminifers,and6ostracods.Theycompriseamixtureofspecimensinhabitingshallowmarineenvironmentscharacterizedbystrongbottomcurrentsandbelongingtodifferent localcommunitiesassociatedwiththespatialheterogeneityinthisbasin.Thetaxonomiccompositionofthispaleofaunashowsremarkablesimilaritieswithpresent-dayfauna,indicatingthatboth groupsdevelopedundersimilarenvironmentalconditions.However,slightdifferentclimaticconditionsattheageofdepositioncannotberuledout.Aswell,anecosystemtransitiontowardsatrulymarine environmentwithhighnumberoftaxawasrecognized.Finally,a Hiatella-cirripedassemblagedeserves specialattentionsincethepolymorphicshelloffossilandliving Hiatella is usedasapaleo-environmentaltool.Inthisregard,thesmallsizeof Hiatella in thestudiedmarineunitisbestrelatedtoits modeoflifeasanestlerwithinemptytestsofbarnacles,whichapparentlyservedasmicroenvi-ronments forthisspecies.Nevertheless,moregeochemicaldataonlivingandfossil Hiatella shells fromthe BeagleChannelwillbenecessarytotestthesuitabilityofusingthisspeciestoevaluatepaleo-temperaturesandotherseawatervariationsduringtheQuaternary.
