. Geology of the Narragansett basin. Geology. Pig. 29.~Oase where a boring is the most economical and certain method of determining the presence of a series of coal beds in a given thickness of coal measures. River in Swansea. In ai*eas of vertical strata, trenching across the upturned edges of the beds would better serve the purpose. (See figs. 29 and 30.) THICKKESS OE THE CARBOKIEEROUS. There ai'e but few cross sections of the strata obtainable in the Narra- gansett Basin which are so far free from the perplexing hindrances set forth in the introduction to this report that the geologist can
. Geology of the Narragansett basin. Geology. Pig. 29.~Oase where a boring is the most economical and certain method of determining the presence of a series of coal beds in a given thickness of coal measures. River in Swansea. In ai*eas of vertical strata, trenching across the upturned edges of the beds would better serve the purpose. (See figs. 29 and 30.) THICKKESS OE THE CARBOKIEEROUS. There ai'e but few cross sections of the strata obtainable in the Narra- gansett Basin which are so far free from the perplexing hindrances set forth in the introduction to this report that the geologist can with confidence. Pig. 30—Case where a boring may miss an important coal bed and is not likely to discover more than one, and Inhere a trench at right angles to the strike would reveal the true number of seams of coal. give an estimate of the thickness of the beds entering into them. The most satisfactory line of section in the northern part of the basin passes from the southern margin through the Dighton-Swansea and Great Meadow Hill or Taunton synclines toward Mansfield and the northern border. The general relations of the structure along this Hne are shown in fig. 8 (p. 122). Measurements along this line give about 12,000 feet as the thiokness of the. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Shaler, Nathaniel Southgate, 1841-1906; Woodworth, Jay Backus, 1865-1925; Foerste, Aug. F. (Aug. Frederic), 1862-1936. Washington, Govt. Print. Off.
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