Late glacial and Holocene landscape change and rapid climate and coastal impacts in the Canal Beagle, southernmost Patagonia

McCulloch, Robert; Mansilla, Claudia A; Morello, Flavia; Pol‐Holz, Ricardo De; Román, Manuel San; Tisdall, Eileen; Torres, Jimena

doi:10.1002/jqs.3167

Cited by 15 publications

(9 citation statements)

References 38 publications

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“…This is consistent with the rapid expansion of Myriophyllum at the end of the ACR suggesting lake level lowering and an expansion of the shallow littoral zone. This amplification of the Nothofagus signal related to site water levels has been identified elsewhere (McCulloch et al, 2019).…”

Section: Late Glacial Landscapesupporting

confidence: 67%

“…However, as found in many pollen records from the region (Markgraf and Huber, 2010;Mansilla et al, 2016Mansilla et al, , 2018McCulloch et al, 2019McCulloch et al, , 2020, there is no unambiguous signal for cooler temperatures between c. 14,440 and 12,740 cal yr BP (Gest et al, 2017). However, the virtual disappearance of Myriophyllum during the ACR appears to be a consistent pattern that may suggest slightly cooler temperatures in the southern sector of Patagonia (McCulloch et al, 2020).…”

Section: Late Glacial Landscapementioning

confidence: 90%

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The nature and timing of landscape change at Cerro Benítez, Última Esperanza, southern Patagonia (52°S): New insights into the history of megafaunal extinctions and human occupation

McCulloch

Mansilla

Martin

et al. 2021

Quaternary International

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Section: Late Glacial Landscapesupporting

confidence: 67%

Section: Late Glacial Landscapementioning

confidence: 90%

The nature and timing of landscape change at Cerro Benítez, Última Esperanza, southern Patagonia (52°S): New insights into the history of megafaunal extinctions and human occupation

McCulloch

Mansilla

Martin

et al. 2021

Quaternary International

Self Cite

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“…Un estudio efectuado en proximidad a Caleta Eugenia (Isla Navarino) señala el inicio de la transgresión marina hace 8700 años cal. AP (7925 ± 25 años 14 C AP) en el sector oriental del Canal Beagle (McCulloch et al 2019). Otro estudio realizado a lo largo de la costa norte de Isla Navarino presenta dos curvas de cambios del nivel del mar para el área durante el Holoceno: una para el sector oeste y otra para el centro y este de la isla (Björck et al 2021).…”

Section: Contexto Paleogeográficounclassified

Colonización Humana De Tierra Del Fuego: Contextos Arqueológicos Pretransgresivos en La Costa Norte Del Canal Beagle

et al. 2022

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Partimos de algunas predicciones derivadas del modelo biogeográfico propuesto por Luis Borrero (1989-90) para analizar las ocupaciones humanas más tempranas identificadas en la costa norte del Canal Beagle (8600-6500 años cal. AP). Examinamos la información cronológica, estratigráfica y la composición de los depósitos basales de Imiwaia I, Binushmuka I y Túnel I con el fin de explorar los procesos de formación y estructura temporal de los contextos arqueológicos en momentos previos al máximo alcance de la transgresión marina del Holoceno. Se observa una actividad humana continua en la costa sur de Tierra del Fuego desde hace al menos 8600 años cal. AP. Las estructuras de los depósitos más tempranos marcan ocupaciones con baja intensidad y discretas en el tiempo. La señal arqueológica se mantiene débil hasta que la transgresión marina del Holoceno alcanzó su máximo nivel en un momento cercano a los 7000 años cal. AP, cuando la formación de depósitos arqueológicos multicomponentes (concheros) comenzó a hacerse visible en la región. Por último, se discuten las implicaciones de esta información para el poblamiento del archipiélago fueguino.Palabras claves: arqueología de costas, transgresión marina, Tierra del Fuego, datos radiocarbónicos, cazadores-recolectores.We address some predictions derived from the biogeographic model proposed by Luis Borrero (1989-90) in order to analyze the earliest human occupations identified on the north coast of the Beagle Channel (8600-6500 cal. years BP). We examined the chronological, stratigraphic and archaeological information from the basal deposits of Imiwaia I, Binushmuka I and Túnel I to explore the formational processes and temporal structure of the archaeological contexts during the maximum extension of the Holocene marine transgression. Continuous human activity is inferred from 8600 cal. years BP on the southern coast of Tierra del Fuego. The structures of the earliest archaeological deposits indicate low-intensity and discrete occupations over time. The archaeological signal remains weak until the Holocene marine transgression reached its maximum level at approximately 7000 cal. years BP, when the formation of multicomponent archaeological deposits (shell middens) becomes visible in the region. Lastly, we discuss the implications of this information for the colonization of the Fuegian archipelago.

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“…Although Bayesian techniques use a different approach in the construction of age models, the ‘best-fit’ model can resemble simple linear interpolation e.g., when the mean age-depth model goes through each calibrated age range with changes in accumulation rate at dated depths. Resemblance to linear interpolation occurred in half (48%) of the Bacon models we examined (e.g., Yongbo Wang et al, 2019; McCulloch et al, 2019) and most if not all of the OxCal (e.g., Frodlová et al, 2018) and Bchron (e.g., Schiferl et al, 2018) models. Trachsel and Telford (2017) observed that “ although Bayesian age-depth modelling routines simulate changing accumulation rates, the mean accumulation rate (that is mostly used by scientists) is fairly constant between two dated levels, and therefore, the age-depth model is a straight line between two dated levels .” Similarity to linear interpolation is not altogether surprising, especially for Bacon and Bchron , as they are based in part on modelling piece-wise linear accumulations.…”

Section: Classical and Bayesian Age-depth Modelsmentioning

confidence: 99%

Current practices in building and reporting age-depth models

Lacourse

Gajewski

2020

Quat. res.

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Age-depth models provide essential temporal frameworks in paleoenvironmental science. We use a sample of 80 recently-published age-depth models to comment on current practices in building and reporting radiocarbon-based age-depth models. We address options for model building, sampling strategies, dating densities, and best practices for reporting age-depth models and associated data. Our review reveals incomplete reporting of 14C ages, model-building methods, age-depth models and associated meta-data in many recent studies. All information needed to evaluate, reproduce and update an age-depth model should accompany every published model. We also present a case study of building age-depth models for a lake sediment core that has both 14C ages and an independent varve chronology. The case study illustrates that choosing the ‘best model’ is not a simple task, and that model accuracy is ultimately controlled by differences between 14C ages and true age that likely occur in many late Quaternary records.

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Late glacial and Holocene landscape change and rapid climate and coastal impacts in the Canal Beagle, southernmost Patagonia

Abstract: This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for selfarchiving.

Cited by 15 publications

References 38 publications

The nature and timing of landscape change at Cerro Benítez, Última Esperanza, southern Patagonia (52°S): New insights into the history of megafaunal extinctions and human occupation

The nature and timing of landscape change at Cerro Benítez, Última Esperanza, southern Patagonia (52°S): New insights into the history of megafaunal extinctions and human occupation

Colonización Humana De Tierra Del Fuego: Contextos Arqueológicos Pretransgresivos en La Costa Norte Del Canal Beagle

Current practices in building and reporting age-depth models

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