North America

These soft-sediment structures in Guadalupe National Park, Texas, are made of yellowish sandstone from the Permian Period.

What used to be part of the ocean is now Guadalupe National Park in Texas, USA.

A database of relative sea-level data for the past 16 ka constrains the sea-level histories of the Pacific coast of central North America (southern British Columbia to central California).

Map of the "Ring of Fire" showing volcanoes, seismicity and plate boundaries around the Pacific Ocean.

Owing to recent advances in observational methods and modeling techniques, the development of physical models of the seismic cycle with predictive power may seem at reach in a foreseeabl

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