Late Pleistocene and Holocene development of Castillos Lagoon in relation of sea level variation, SE Uruguay

García-Rodríguez, Felipe; Metzeltin, Ditmar; Sprechmann, Peter; Morales, Luis Felipe Beltran

doi:10.1127/njgpm/2004/2004/641

Cited by 4 publications

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“…When sea level reached its Holocene peak around 6.0 ka, it filled the basin of a Pleistocene lagoon (Bracco et al., ; García‐Rodriguez et al., ). Such intrusion of the sea gave rise to the formation of an elongated leaky lagoon (after Bird, ) with the major axis running almost parallel to the coast.…”

Section: Resultsmentioning

confidence: 99%

“…Geoarchaeological analyses relied on information from paleoenvironmental and archaeological research carried out in the area over the last two decades. Several sources were consulted in this study, including geomorphological, sedimentological, geochronological, and biological analyses of coastal traits and landforms of the Castillos Lagoon, coupled with multiproxy paleolimnological analyses of sedimentary cores from the lagoon and its watershed (Bracco et al., , ; Castiñeira, Fernández, & Cespedes, ; Castiñeira, Fernández, & Piñeiro, ; del Puerto et al., , ; García‐Rodríguez, Metzeltin, Sprechmann, & Beltrán‐Morales, ; Segura, ).…”

Section: Methodsmentioning

confidence: 99%

“…Furthermore, as the Castillos Lagoon is a shallow water body, the difference in height between wave‐originated deposits and mean sea level is less than that on the open sea shore. Together with littoral landforms, geochronological and biological proxies of bottom deposits provide information about lagoon level evolution, the age of the tidal flat that closed the lagoon's mouth, and the beginning of the current tidal stream (Bracco et al., , ; del Puerto et al., ; García‐Rodríguez, Metzeltin, Sprechmann, & Beltrán‐Morales, ; Segura, ). Given the high resolution of the Castillos Lagoon record, it was the main source of data regarding Holocene sea levels, and this comprehensive data set represented the starting point for developing the Uruguayan coast sea‐level curve (Bracco et al., , ).…”

Section: Methodsmentioning

confidence: 99%

“…The later formation of beach ridge systems could have been favored by the prevailing drier climate, as the lagoon received a higher amount of sandy sediments originating from the extensive coastal plains exposed by sea-level decrease (Panario & Piñeiro, 1997). Such eolian sand transport processes were evidenced in the LCA11 core by 4 m of fine to very fine sand layer dating to >3.5 ka García-Rodríguez et al, 2004).…”

Section: 5-35 Ka: Sea-level Decrease and Climatic Deteriorationmentioning

confidence: 99%

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Formation processes of coastal archaeological sites: A changing prehistoric scenario on the Atlantic shore of Uruguay

et al. 2017

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Paleoenvironmental reconstructions coupled with archaeological research are useful tools for discriminating natural versus anthropogenic environmental variability and identifying local environmental responses to global changes and consequent human adaptations. Here we present a multidisciplinary study focused on the identification of drivers and mechanisms that shaped environments along the Uruguay coast and how those environments influenced prehistoric settlement patterns, subsistence strategies, and site formation processes at the archaeological sites of Cape Polonio and Castillos Lagoon. We identify a strong linkage between environmental dynamics and the timing, spatial allocation, and subsistence strategies of prehistoric inhabitants. Human occupation took place in very specific landscape settings where contemporaneous settlements were identified in persistent eolian landscape features. An opportunistic exploitation of more dynamic locations was also identified, where sea‐level shifts created land surfaces preferred by humans. The results of our study represent a useful tool not only for identifying archaeological sites in similar contexts but also for providing insights into how modern coastal populations might adapt to changing environments associated with rising sea level.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: 5-35 Ka: Sea-level Decrease and Climatic Deteriorationmentioning

confidence: 99%

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Formation processes of coastal archaeological sites: A changing prehistoric scenario on the Atlantic shore of Uruguay

et al. 2017

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A multiproxy approach to inferring Holocene paleobotanical changes linked to sea-level variation, paleosalinity levels, and shallow lake alternative states in Negra Lagoon, SE Uruguay

et al. 2010

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A multiproxy analysis of diatoms, chrysophyte cysts, opal phytoliths, and palynomorphs was undertaken in Negra Lagoon, to decipher Holocene changes in paleobotanical proxies associated with sea-level changes and paleolimnological conditions. Before the Holocene transgression (7000 yr BP), a terrestrial system was inferred as no aquatic palynomorphs or biogenic silica remains were recorded. During the sea-level maximum (5200 yr BP), marine/ brackish conditions were established as indicated by diatoms, Chenopodiaceae, and a high content of cysts of Peridinioideae. The catchment consisted of grasslands and wetlands as indicated by the opal phytolith data. The Holocene transgression was followed by a sea-level decrease, which led to the onset of brackish/freshwater conditions as inferred from the co-dominance of freshwater and marine/ brackish diatoms. This is also supported not only by the concomitant increase in non-siliceous freshwater microalgae and emergent macrophytes, but also by the presence of Myriophyllum. As sea level continued to decrease during late Holocene, a freshwater system was observed because of the complete separation from the ocean. Chrysophyte cysts were consistently recorded and brackish diatoms exhibited reduced abundances. The observed limnological changes are consistent with the alternative states hypothesis of Scheffer's model (1998). That is, the clear water phases were explained because of high macrophyte abundances, low phytoplankton frequencies, high cyst to diatom ratios, and increase in frequencies of benthic diatom species. Conversely, turbid phases were likely to occur when low cyst to diatom ratios together with increase in planktonic diatoms and decrease in macrophytes values were detected. This highlights the importance of this approach to detect long-term changes in shallow lake alternative states.

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Climate, sea-level and anthropogenic processes controlling the environmental evolution of shallow lakes in the southeastern Pampa plain (South East South America) during the last 12 ka

Francesco

Stutz

Hassan

et al. 2022

Journal of South American Earth Sciences

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Late Pleistocene and Holocene development of Castillos Lagoon in relation of sea level variation, SE Uruguay

Cited by 4 publications

References 0 publications

Formation processes of coastal archaeological sites: A changing prehistoric scenario on the Atlantic shore of Uruguay

Formation processes of coastal archaeological sites: A changing prehistoric scenario on the Atlantic shore of Uruguay

A multiproxy approach to inferring Holocene paleobotanical changes linked to sea-level variation, paleosalinity levels, and shallow lake alternative states in Negra Lagoon, SE Uruguay

Climate, sea-level and anthropogenic processes controlling the environmental evolution of shallow lakes in the southeastern Pampa plain (South East South America) during the last 12 ka

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