File:Forest physiography; physiography of the United States and principles of soils in relation to forestry (1911) (14590495337).jpg

Identifier: forestphysiograp01bowm (find matches)
Title: Forest physiography; physiography of the United States and principles of soils in relation to forestry
Year: 1911 (1910s)
Authors: Bowman, Isaiah, 1878-1950
Subjects: Physical geography Forests and forestry Soils
Publisher: New York, J. Wiley & sons (etc., etc.)
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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rtiary peneplain has beengreatly modified by erosion and by uplift, which carried both the Cre-taceous and early Tertiary peneplains above their former level. Thesecond uplift introduced a third or late Tertiary cycle of erosion, whichhad progressed to an even less advanced stage than its immediate prede-cessor when uplift again intervened and brought the land approximatelyto its present level. After this level was attained erosion partiallydestroyed the latest peneplain and continued the destruction of the twohigher peneplains. In a sense it is incorrect to speak of the two Tertiary lowlands as peneplains, for a relativelysmall portion of the whole region was reduced to base level. They are, strictly, local pene-plains, and the durations of the erosion cycles they represent were very short as compared withthe duration of the Jurassic-Cretaceous cycle. The Cretaceous peneplain is called the Cumberland peneplain at thesouth and the Kittatinny (sometimes Schooley) peneplain at the north
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( MAPSHOWINGTHERELAI .ECE EFi rif. FOFTHECH Yig. 23S. — Darkest areas, base-leveled areas of the late Tertiary or Coosa peneplain; lightest shade, earlyTertiary or Highland Rim peneplain; intermediate shade, remnants of the Cretaceous or Cumberlandpeneplain. Residuals above the Cumberland peneplain are shown in slightly darker shade. Scale,20 miles to the inch. (Hayes, U. S. Geol. Surv.) 59S 596 FOREST PHYSIOGRAPHY (Pennsylvania, New Jersey, etc.), in the former case because the sum-mit of the Cumberland Plateau is the best preserved remnant of it, inthe latter case because the even crest of the Kittatinny Mountains ofnorthern New Jersey is due to its former development in that district.The early Tertiary peneplain is called the Highland Rim peneplain atthe south because well preserved beyond (west of) the edge of the Cum-berland Plateau on a surface called the Highland Rim, with respect tothe Nashville Basin below it; the same level is called the Harrisburgat the north because well

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