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Markes E. Johnson and Jorge Ledesma-Vázquez
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Markes E. Johnson
Atmospheric carbon dioxide reached a record concentration of 419 parts per million in May 2021, 50% higher than preindustrial levels at 280 parts per million. The rise of CO2 as a heat-trapping gas is the principal barometer tracking global warming attri...
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Rigoberto Guardado-France, Markes E. Johnson, Jorge Ledesma-Vázquez, Miguel A. Santa Rosa-del Rio and Ángel R. Herrera-Gutiérrez
The 450-m long spit that extends westward from the northwest corner of Isla San Luis Gonzaga is one of the largest and most complex constructions of unconsolidated cobbles and boulders found anywhere in Mexico?s Gulf of California. The material source de...
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Markes E. Johnson, Erlend M. Johnson, Rigoberto Guardado-France and Jorge Ledesma-Vázquez
Previous studies on the role of hurricanes in Mexico?s Gulf of California examined coastal boulder deposits (CBDs) eroded from limestone and rhyolite sea cliffs. Sedimentary and volcanic in origin, these lithotypes are less extensively expressed as rocky...
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Derek. N. Mottershead, Philip J. Soar, Malcolm J. Bray and Linley J. Hastewell
The Zonqor coastline, southeast Malta, displays an exceptional range of geomorphic signatures of extreme coastal events. This paper brings together evidence acquired from a field survey, analysis of time-sequential imagery, and hydrodynamic modelling to ...
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Sérgio P. Ávila, Markes E. Johnson, Ana Cristina Rebelo, Lara Baptista and Carlos S. Melo
Modern and palaeo-shores from Pleistocene Marine Isotope Substage 5e (MIS 5e) featuring prominent cobble/boulder deposits from three locations, on the southern and eastern coast of Santa Maria Island in the Azores Archipelago, were compared, in order to ...
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Dmitry A. Ruban
Modern geoscience research pays significant attention to Quaternary coastal boulder deposits, although the evidence from the earlier geologic periods can be of great importance. The undertaken compilation of the literature permits to indicate 21 articles...
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Luis A. Spalletti,Gonzalo D. Veiga,Juan R. Franzese
Pág. 521 - 538
The siliciclastic deposits of the Rancahué Formation (Oligocene, Aluminé Basin), formed in the eastern side of the Andean Cordillera (70ºW y 39ºS) are studied to evaluate the relationship among different depositional systems in volcanic settings and to d...
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