Transactions . dspar to indicate a clastic rock, suchas a slate. Prof. Kemp concludes by saying that the slides suggeststrongly that the source of the material was from feldspathicrather than quartzose originals. Most of the rocks in the Department of Panama seem tohave been weathered to considerable depth. In the cuts in thenine miles of railroad, very little unaltered rock was encoun-tered, and the larger portion of the material was so decomposedthat it gave no clue to its original nature. Those rocks whichhad not sufficiently deteriorated to prevent recognition weresandstone, shale and serp
Transactions . dspar to indicate a clastic rock, suchas a slate. Prof. Kemp concludes by saying that the slides suggeststrongly that the source of the material was from feldspathicrather than quartzose originals. Most of the rocks in the Department of Panama seem tohave been weathered to considerable depth. In the cuts in thenine miles of railroad, very little unaltered rock was encoun-tered, and the larger portion of the material was so decomposedthat it gave no clue to its original nature. Those rocks whichhad not sufficiently deteriorated to prevent recognition weresandstone, shale and serpentine—all sedimentary or metamor-phic rocks and none of igneous origin. No limestones werefound in any portion of the line, and no outcrops of that rockhave been observed by the writer in that immediate neigh-borhood. Gcohxpj of Colombia.—Before entering into the discussion ofthe probable origin and formation of these manganese-deposits,it would be well to give a general abstract of the information Fig. Gravity-Incline at the Manganese-Mines, Panama,Fig. 3.
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