408 Scientific Intelligence. 
thickness of the anthracite beds. from the mouth of the tunnel 
through the Mammoth bed, E, to F inclusive (the lower Red Ash 
coal bed), is 56 feet. The section illustrates (1) the doubling of a - 
bed on itself, so doubling its thickness; (2) the uncertainty of 
determinations of the thickness of beds of rock in a region of flex- 
ures (the two parts of F at F* being separated by only a thin 
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outcrop of the thick strata, wholly unlike what intervenes 
between F" and F’, and between F* and F*; (3) the increase 1D 
the vertical depth of a bed where it is doubled up in the central 
2. Geological Survey of New Jersey; Report for 1883, G. H 
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various facts adduced sustaining the opposing opinion—-that ; . 
the trappean ranges are alike of a later age than the Red san@ — - 
