. The Quarterly journal of the Geological Society of London. inct from the sands which alternate withthe mottled clays incumbent on the chalk in West Surrey, Hertford-shire, Buckinghamshire, and Berkshire, and that the latter form aseparate group,—it must be observed that neither mineral charactersnor organic remains alone suffice to determine the question; for theproofs depend upon general structure and superposition, upon unityin the general design, and upon certain constant characters and con-ditions. The following sections which I have given elsewhere*, and for theuse of which I am indebte
. The Quarterly journal of the Geological Society of London. inct from the sands which alternate withthe mottled clays incumbent on the chalk in West Surrey, Hertford-shire, Buckinghamshire, and Berkshire, and that the latter form aseparate group,—it must be observed that neither mineral charactersnor organic remains alone suffice to determine the question; for theproofs depend upon general structure and superposition, upon unityin the general design, and upon certain constant characters and con-ditions. The following sections which I have given elsewhere*, and for theuse of which I am indebted to Mr. Van Voorst, will serve to illustratethe relative position and importance of the several divisions of the Lower Tertiaries in their range from east to west. These sections are on a vertical scale of 50 feet to 1 inch. * A Geological Inquiry respecting the Water-bearing Strata of the countryaround Loudon, 1851. 8vo. John Van Voorst, London. 239 1852.] PRESTWICH ON THE THANET SANDS. Fig. \.—Section of the Cliff a mile and a half east of Heme Feet. Upper ;Division, Middle. ^
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Keywords: ., bookcentury1800, bookdecade1840, booksubjectgeology, bookyear1845
