... over comparison by bulk samples, since the latter represent varying thicknesses, which makes for confusion in detailed correlation. On the samplograph one gets a bird’s-eye view, so to speak, of long sections of two or more logs, and picks up the entire features or total expression of each on the same...

..., Indiana ( 1933 ). 483 pp., 42 pls. JAMES H. GARDNER , “ The Samplograph ,” Bull. Amer. Assoc. Petrol. Geol. , Vol. 11 ( 1927 ), pp. 867 – 68 . ARCHIBALD GEIKIE , The Founders of Geology , 2d ed. Macmillan and Company , London ( 1905 ). 486 pp. CONRAD GESNER , De...