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A review of the available information on carbonaceous sedimentary rocks in the republics of Guatemala, El Salvador, Honduras, Nicaragua, Costa Rica, and Panama reveals the presence of coal and lignite beds, but no commercial production has been developed in any of these countries. The oldest coal beds, with thicknesses up to 2.5 m, crop out in central Honduras in at least six localities. They are interbeds in the argillaceous Triassic-Jurassic(?) El Plan Formation. This unit is strongly folded and faulted and in some places is intruded by dioritic plutons. The outcrops—in Yoro Department, Honduras—appear to be less deformed.

In west-central...

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