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Upper Silurian and Lower Devonian Stratigraphy of Northeastern Pennsylvania, New Jersey, and Southeasternmost New York
"A description and partial revision of the physical stratigraphy and interpretations of depositional environments."--T.p.
USGS Research on Mineral Resources--1989
See journals under US Geological survey. Circular 1035.
Archeology and Volcanism in Central America
Scientists have long speculated on the impact of extreme natural catastrophes on human societies. Archeology and Volcanism in Central America provides dramatic evidence of the effects of several volcanic disasters on a major civilization of the Western Hemisphere, that of the Maya. During the past 2,000 years, four volcanic eruptions have taken place in the Zapotitán Valley of southern El Salvador. One, the devastating eruption of Ilopango around A.D. 300, forced a major migration, pushing the Mayan people north to the Yucatán Peninsula. Although later eruptions did not have long-range implications for cultural change, one of the subsequent eruptions preserved the Cerén site—a Mesoameri...
