Miocene columnar basalts that contributed to the formation of the Isthmus of Panama are removed for the expansion of the Panama canal. This material relates to a paper that appeared in the Aug. 17 ...
Along the course are narrow basalt gorges and towering basalt columnar joints formed from lava that erupted around 500,000 to 100,000 years ago, according to the county. Other activities at the ...
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