. Annual report of the United States Geological Survey to the Secretary of the Interior . Am. helvidere, Anchura, Trigonia. stone; ferruginous sandstone, iron ore, and clays, which lie between thetop of the Fort Worth lime-stone and the Grayson marls. In pi*evious papers thewriter and others have givennames to some of the variousmembers of the Denison beds,but much confusion has re-sulted from misunderstand-ing the use of these terms,all of which were but tempo-rary expedients. It will bebest for the reader to discardany attempt to follow outthese previous attempts atclassification and to appr
. Annual report of the United States Geological Survey to the Secretary of the Interior . Am. helvidere, Anchura, Trigonia. stone; ferruginous sandstone, iron ore, and clays, which lie between thetop of the Fort Worth lime-stone and the Grayson marls. In pi*evious papers thewriter and others have givennames to some of the variousmembers of the Denison beds,but much confusion has re-sulted from misunderstand-ing the use of these terms,all of which were but tempo-rary expedients. It will bebest for the reader to discardany attempt to follow outthese previous attempts atclassification and to approachthe whole subject de the descriptions and sec-tions the letter symbols usedfor certain conspicuous pale-on tologic horizons will be ofgreat service in enabling thereader to follow the correla-tion. (See section 26, p. 247,and fig. 32.).
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