The last glacial maximum in the Basin of Mexico: The diatom record between 34,000 and 15,000 years BP from Lake Chalco

Miranda, Margarita Caballero

doi:10.1016/s1040-6182(97)00028-1

Cited by 19 publications

(2 citation statements)

References 15 publications

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“…There were occasional lake high stands, but much of the diatom accumulation took place in smaller, alkaline pools. This impression is derived from paleoenvironmental interpretations from the former Lake Chalco deposits (Caballero- Miranda, 1997;Urrutia-Fucugauchi et al, 1995) that characterise the Late Pleistocene lake as variable in depth, oscillating between fresh and saline water. As for the suggested beach deposits, it is hard to see how even full lake levels of around 20m would produce wave action to form beach pebbles and these pebbles would be rounded.…”

Section: Previous Work At Tlapacoyamentioning

confidence: 99%

Paleoindian sites from the Basin of Mexico: Evidence from stratigraphy, tephrochronology and dating

González

Huddart

Alcántara

et al. 2015

Quaternary International

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We present new data on the stratigraphy, dating and tephrochonology at the most important Paleoindian sites in the Basin of Mexico. These include: a) Peñon Woman III, with the oldest directly radiocarbon dated human remains (10,755± 75 yr BP); b) Tlapacoya, with two human crania dated to just over 10 ka BP; c) Tocuila, an important mammoth site with incorporation of fossils and suggested bone tools within the Upper Toluca Pumice (UTP) lahar (volcanic mudflow). The Tocuila site also includes potential evidence for a layer associated with the Younger Dryas meteorite airburst, with charcoal, iron microspherules, micro-tektites (melted glass) and volcanic ash, dated to 10,800 ± 50 yr BP and d) the Santa Isabel Iztapan mammoths I and II with lithics of Scottsbluff, Lerma and Angostura types and obsidian prismatic blades but lacking the characteristic fluted Clovis type points normally associated with mammoth kills and butchering and dated after the Pumice with Andesite (PWA) layer ~14,500 BP, to 10, 900 yr BP, before the Younger Dryas interval. These results show that these lithic traditions in Central Mexico are older than in the Great Plains of USA. Several tephra markers are recognised in the sites that help to constrain the stratigraphy and dating of the archaeological sequences. However tephra reworking in marginal lake sites is present and has been carefully considered, especially for the PWA tephra. Quaternary InternationalWe the undersigned declare that this manuscript is original, has not been published before and is not currently being considered for publication elsewhere.We confirm that the manuscript has been read and approved by all named authors and that there are no other persons who satisfied the criteria for authorship but are not listed. We further confirm that the order of authors listed in the manuscript has been approved by all of us.We understand that the Corresponding Author is the sole contact for the Editorial process. He/she is responsible for communicating with the other authors about progress, submissions of revisions and final approval of proofs.Signed by all authors as follows:Silvia Gonzalez, David Huddart, Isabel Israde Alcantara, Gabriela Dominguez Vazquez and James Bischoff Thank you very much for the invitation to submit this paper for your special volume. Sorry that took so long but finally is finished.The paper includes new stratigraphic, teprochronology and dates regarding the most important Paleoindian sites for the Basin of Mexico together with their evaluation and Interpretation. The impact of volcanic activity is a very important factor also the potential if controversial YD Meteorite impact for which we have found evidence in the basin. Best regards Prof Silvia GonzalezProf of Quaternary Geology and Geoarcheology Liverpool John Moores University AbstractWe present new data on the stratigraphy, dating and tephrochonology at the most important Paleoindian sites in the Basin of Mexico. These include: a) Peñon Woman III, with the oldest directly radiocarbon dated huma...

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Section: Previous Work At Tlapacoyamentioning

confidence: 99%

Paleoindian sites from the Basin of Mexico: Evidence from stratigraphy, tephrochronology and dating

González

Huddart

Alcántara

et al. 2015

Quaternary International

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“…These basins have been the location of repeated events of inundation and drying (Lozano García et al, 1993;Caballero Miranda, 1996, 1997aCaballero Miranda and Ortega Guerrero, 1998;Caballero Miranda et al, 1999;Caballero Miranda et al, 2010), resulting in the burial of large amounts of organic matter. At places like the vicinity of Lake Xochimilco, where large amounts of organic matter have been piled up together with volcanic ashes and surrounded by lava flows of various ages, underground fires are reported when the release of methane starts to be ignited.…”

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confidence: 99%

Extreme Volcanic Risks 1

Granados

Jenkins

2015

Volcanic Hazards, Risks and Disasters

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Glacial reduction of the North American Monsoon via surface cooling and atmospheric ventilation

Bhattacharya

Tierney

DiNezio

2017

Geophysical Research Letters

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The North American Monsoon (NAM) provides critical water resources to the U.S. southwest and northwestern Mexico. Despite its importance to regional hydrology, the mechanisms that shape this monsoon are not fully understood. In this paper, we use model simulations of the Last Glacial Maximum (LGM, 21 ka B.P.) to assess the sensitivity of the NAM to glacial boundary conditions and shed light on its fundamental dynamics. We find that atmospheric changes induced by ice sheet albedo reduce NAM intensity at the LGM. The high albedo of the Laurentide ice sheet cools the surface and drives anomalous northwesterly winds that reduce the monsoon circulation and import cold, dry air into the core NAM region. Our work emphasizes the role of ice sheet albedo rather than topography in driving the atmospheric changes that modulate the glacial NAM, and ties our understanding of the NAM to broader theories of monsoon systems.

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The last glacial maximum in the Basin of Mexico: The diatom record between 34,000 and 15,000 years BP from Lake Chalco

Cited by 19 publications

References 15 publications

Paleoindian sites from the Basin of Mexico: Evidence from stratigraphy, tephrochronology and dating

Paleoindian sites from the Basin of Mexico: Evidence from stratigraphy, tephrochronology and dating

Extreme Volcanic Risks 1

Glacial reduction of the North American Monsoon via surface cooling and atmospheric ventilation

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