Fluvial tufa evidence of Late Pleistocene wet intervals from Santa Barbara, California, U.S.A.

Ibarra, Yadira; Corsetti, Frank A.; Feakins, Sarah J.; Rhodes, E. J.; Kirby, Matthew E.

doi:10.1016/j.palaeo.2015.01.012

Cited by 13 publications

(22 citation statements)

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“…These wetland areas are very sensitive to climatic oscillations (e.g. Andrews, 2006;Viles et al, 2007;Gonz alez-Amuchastegi and Serrano, 2015;Ibarra et al, 2015), being extremely fragile depositional environments that respond rapidly to changes in both natural and anthropicallyinduced environmental dynamics. The calcareous tufas are therefore key elements in reconstructing and understanding the palaeoenvironmental evolution and its climatic controls and/or human impacts (Dabkowski, 2014).…”

Section: Palaeoenvironmental Evolution and Climatic Contextmentioning

confidence: 99%

8.2 ka BP paleoclimatic event and the Ebro Valley Mesolithic groups: Preliminary data from Artusia rock shelter (Unzué, Navarra, Spain)

Lagrán

Iriarte

García-Gazólaz

et al. 2016

Quaternary International

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a b s t r a c tThis paper presents the results of the first excavation campaign of the Artusia rock shelter in Unzu e, Navarre, Spain. Chronocultural and archaeobiological analyses revealed five different occupation phases (Artusia IeV) within the regional Mesolithic timeline, specifically in the Mesolithic of Notches and Denticulates (Artusia I and II) and the Geometric Mesolithic (Artusia III, IV, and V). In addition, the study of the sedimentological and palaeoenvironmental evolution in the entire record helped to clearly define several climatic events which developed around 6550 cal BCe8500 cal BP and 6250 cal BCe8200 cal BP. Here, we present a description of these events and their (pre)historical interpretation with the aim of recognizing how they influenced the Mesolithic hunteregatherer groups living in the Ebro Basin of the Iberian Peninsula.© 2015 Elsevier Ltd and INQUA. All rights reserved.Lydia Zapata, in memoriam IntroductionIn recent decades, the study of the Mesolithic in the Iberian Ebro Valley has focused mainly on the definition of different phases in accordance with the lithic industry as well as on the publication of several time series. Questions relating to subsistence and environment have also been addressed which results suggest an intense, planned and diversified type of exploitation and economy. The publication of a variety of monographs on particular sites (Barandiar an-Maestu, 1978 However, aspects related to palaeoclimatic and palaeoenvironmental changes and their influence on the historical evolution of Mesolithic groups have only been tackled in recent years (Gonz alez-Samp eriz et al., 2008García-Martínez de Lagr an, 2012). From this perspective, the data obtained on the Artusia rock shelter help to reinitiate the * Corresponding author.E-mail address: igmtzl@gmail.com (I. García-Martínez de Lagr an). Contents lists available at ScienceDirectQuaternary International j o u r n a l h o m e p a g e : w w w . e l s e v i e r . c o m / l o c a t e / q u a i n t Archaeological site: discovery and geographical frameworkThe Artusia rock shelter is located at Unzu e, a small village in the eastern part of Navarre, in the Valdorba region (Fig. 1). This archaeological site was discovered in 1996, and the preservation problems that this rock shelter faces due to the erosion derived by the Artusia stream are highlighted. Artusia is located, as are many other Mesolithic rock shelters from the southern Pyrenean slope, on a rock face, to which morphology refers its name in Basque (Arluxea ¼ long crag). It is located at the southern slope of a narrow pass that the Artusia stream excavated between the Alaiz Mountains on the north, and the Unzu e Crag on the south (Fig. 1). The rock shelter is filled by a stratigraphic package cut lengthwise by the stream that exposes the different archaeological levels which form most of the sequence (Figs. 2 and 3).The area where Artusia is situated represents the geological, climatic, floristic and politico-administrative border between the pre-Pyrenean Pamplona ...

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Section: Palaeoenvironmental Evolution and Climatic Contextmentioning

confidence: 99%

8.2 ka BP paleoclimatic event and the Ebro Valley Mesolithic groups: Preliminary data from Artusia rock shelter (Unzué, Navarra, Spain)

Lagrán

Iriarte

García-Gazólaz

et al. 2016

Quaternary International

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“…Samples where the tubule bundles remain filled, and where etched samples reveal insoluble elongate branching stalks (Figure c), indicate preservation of EPS organics (Figure d–f). These observations indicate that despite the absence of a surface Oocardium colony, the EPS stalks and associated calcite microstructure can remain preserved in recent carbonate deposits (1987AD‐recent; Ibarra et al., ). The length of the EPS stalk we observe (~150 μm; Figure d) corroborates modern observations that indicate that a single Oocardium EPS stalk can be up to ten times the cell length or more (Rott et al., ).…”

Section: Discussionmentioning

confidence: 89%

“…The uniformity with respect to the growth axis of Oocardium has been observed in the western Alps where discrete Oocardium calcite rhombohedra form an elongate parallel shape in response to the orientation of the original seed crystal (Type 2 calcification in Rott, Hotzy, Cantonati, & Sanders, ), suggesting that diagenetic recrystallization is templated by the initial Oocardium calcite crystal. While we know the approximate ages for the Oocardium biosignatures from Santa Barbara (~1987‐recent; Ibarra et al., ), we do not know the depositional ages of the carbonate deposit from Santa Cruz but suspect they are the result of spring carbonate deposition associated with an ancient pluvial period. The lack of precise ages for the timing of deposition of the Santa Cruz deposits, however, has no bearing on the timing of the diagenetic progression involving the aggrading recrystallization we observe, as previous work has demonstrated that recrystallization in spring carbonate deposits is not time‐dependent and is instead driven by environmental conditions (Rainey & Jones, ).…”

Section: Discussionmentioning

confidence: 90%

“…(a) Map of California denoting Santa Barbara and Santa Cruz carbonate localities modified from Ibarra et al. ();. (b) Outcrop of inactive spring carbonate mound from Santa Cruz.…”

Section: Previous Work and Environmental Settingmentioning

confidence: 99%

“…We investigated and compared spring-associated fluvial carbonate deposits from Santa Barbara and Santa Cruz, California (Figure 1a). Two carbonate deposits have been described at the Santa Barbara site, (a) a perched deposit that occurs away from modern spring flow that records at least two episodes of carbonate growth dating to the early Holocene and late Pleistocene and (b) a second deposit that forms along the modern spring flow path during wet periods (Ibarra, Corsetti, Feakins, Rhodes, & Kirby, 2015). Carbonates from the modern spring flow path are the focus of this study and are composed of light and dark mesoscopic (cm-scale) calcite laminae (Ibarra, Corsetti, Cheetham, & Feakins, 2014).…”

Section: Spring-associated Carbonates Near Zaca Lake In Santa Barbamentioning

confidence: 99%

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A freshwater analog for the production of Epiphyton‐like microfossils

Ibarra

Sanon

2019

Geobiology

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Calcified microbial microfossils—often interpreted as cyanobacteria—were important components of Precambrian and Paleozoic limestones, but their paucity in modern marine environments complicates our ability to make conclusive interpretations about their taxonomic affinity and geologic significance. Freshwater spring‐associated limestones (e.g., travertine and tufa) serve as terrestrial analogs to investigate mineralization in and around aquatic biofilms on observable timescales. We document the diagenesis of calcite fabrics associated with the freshwater algae Oocardium stratum, an epiphytic colonial green algae (desmid) known for producing stalks of extracellular polymeric substances (EPS) and passively producing a bifurcating tubular calcite monocrystal. Bifurcating EPS stalks produced by Oocardium colonies can become calcified and preserved in ancient carbonate deposits. Calcified micritic EPS stalks have a filamentous morphology, show evidence of branching, and maintain uniformity in diameter thickness throughout the mm‐scale colony, much like the enigmatic calcimicrobe Epiphyton. We provide a mechanism by which calcification associated with a colonial semispherical micro‐organism produces microfossils that deceptively resemble filamentous forms. These findings have implications for the use of morphological traits when assigning taxonomic affinities to extinct microfossil groups and highlight the utility of calcifying freshwater modern environments to investigate microbial taphonomy.

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Great Salt Lake (Utah) Microbialite δ¹³C, δ¹⁸O, and δ¹⁵N Record Fluctuations in Lake Biogeochemistry Since the Late Pleistocene

Newell

Jensen

Frantz

et al. 2017

Geochem Geophys Geosyst

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Extensive lacustrine microbialite deposits exposed along the shores of Great Salt Lake (GSL), Utah preserve a rich continental paleoenvironmental record. Newly‐reported microbialite carbon and oxygen stable isotope ratios in carbonate, nitrogen isotope ratios in organic matter, and organic matter radiocarbon ages archive paleolake hydrological and biogeochemical changes from the late Pleistocene through the Holocene. Positive correlations between δ18O and δ13C in ∼15 – 7.6 cal ka microbialite carbonate are consistent with a hydrologically closed‐basin lake with fluctuations in volume, chemistry, and associated changes in lake primary production. The δ15N of microbialite bulk organic matter (5 – 18 ‰ versus AIR) shows that the balance between nitrogen fixation and assimilation of dissolved inorganic nitrogen has varied significantly. Inverse δ18O and δ13C correlations in combination with high δ15N in some carbonate deposits may imply periods of higher salinity and stable lake stratification similar to modern GSL conditions. We compare our C and O data sets with Pleistocene Lake Bonneville carbonate stable isotope records and demonstrate progressive development of spatially‐isolated hydrological basins during the shift to warmer and drier conditions in the Holocene.

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Fluvial tufa evidence of Late Pleistocene wet intervals from Santa Barbara, California, U.S.A.

Cited by 13 publications

References 55 publications

8.2 ka BP paleoclimatic event and the Ebro Valley Mesolithic groups: Preliminary data from Artusia rock shelter (Unzué, Navarra, Spain)

8.2 ka BP paleoclimatic event and the Ebro Valley Mesolithic groups: Preliminary data from Artusia rock shelter (Unzué, Navarra, Spain)

A freshwater analog for the production of Epiphyton‐like microfossils

Great Salt Lake (Utah) Microbialite δ¹³C, δ¹⁸O, and δ¹⁵N Record Fluctuations in Lake Biogeochemistry Since the Late Pleistocene

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Fluvial tufa evidence of Late Pleistocene wet intervals from Santa Barbara, California, U.S.A.

Cited by 13 publications

References 55 publications

8.2 ka BP paleoclimatic event and the Ebro Valley Mesolithic groups: Preliminary data from Artusia rock shelter (Unzué, Navarra, Spain)

8.2 ka BP paleoclimatic event and the Ebro Valley Mesolithic groups: Preliminary data from Artusia rock shelter (Unzué, Navarra, Spain)

A freshwater analog for the production of Epiphyton‐like microfossils

Great Salt Lake (Utah) Microbialite δ13C, δ18O, and δ15N Record Fluctuations in Lake Biogeochemistry Since the Late Pleistocene

Contact Info

Product

Resources

About

Great Salt Lake (Utah) Microbialite δ¹³C, δ¹⁸O, and δ¹⁵N Record Fluctuations in Lake Biogeochemistry Since the Late Pleistocene