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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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Ginni Callahan, Markes E. Johnson, Rigoberto Guardado-France and Jorge Ledesma-Vázquez
This project examines the role of hurricane-strength events likely to have exceeded 119 km/h in wind speed that entered the Gulf of California from the open Pacific Ocean during Late Pleistocene and Holocene times to impact the granodiorite shoreline on ...
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Inés Galindo, Markes E. Johnson, Esther Martín-González, Carmen Romero, Juana Vegas, Carlos S. Melo, Sérgio P. Ávila and Nieves Sánchez
This study examines the role of North Atlantic storms degrading a Late Pleistocene rocky shoreline formed by basaltic rocks overlying hyaloclastite rocks on a small volcanic peninsula connected to Gran Canaria in the central region of the Canary Archipel...
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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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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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Markes E. Johnson, Ricardo Ramalho and Carlos Marques da Silva
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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, Rigoberto Guardado-France, Erlend M. Johnson and Jorge Ledesma-Vázquez
This work advances research on the role of hurricanes in degrading the rocky coastline within Mexico?s Gulf of California, most commonly formed by widespread igneous rocks. Under evaluation is a distinct coastal boulder bed (CBB) derived from banded rhyo...
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