lava flow (Other Keyword)
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El Malpais National Monument, located at the edge of the Colorado Plateau near the southern boundary of the San Juan Basin, was established to protect the rich diversity of volcanic geologic features that produced one of the longest sequences of volcanic activity in the United States – from about 700,000 to 3,000 years ago. Known collectively as the Grants Lava Flow, there are over nine lava flows each creating a new land surface with lava-influenced environmental conditions. The interaction...
Soil, landsurfaces and settlements under lava: the case of Cuicuilco, Mexico (2015)
First societies based on agriculture settled Mexico Basin around 3000 years ago (from BC 1500 to AD 100), during Formative period, according to Mesoamerican chronology. Cuicuilco is one and probably the first of these Formative sites in Mexico Basin and is located in the southern part of Mexico City, in an area covered by lava flows from the Xitle volcano, named as El Pedregal. The age of the eruption has been established around 1,670+/- 35 years B.P. It is considered that Cuicuilco was probably...