. Maryland geological survey . FlG. I.—VIEW SHOWING SUBAERIAL EROSION ON SUNDERLAND-WICOMICO scarp, nearLEONABDTOWN, ST. MARYS FlG. 2.—VIEW SHOWING AMPHITHEATRE AT HEAD OF YOUNG VALLEY IN SUNDERLANDFORMATION, NEAR MORGANZA, ST. MARYS COUNTY. MARYLAND GEOLOGICAL SURVEY 81 its attitude can be secured by comparing the various elevations of itssurface rather than those of its base. Yet it must be taken into accountthat the areas back on the Piedmont Plateau are not as thick as they wereoriginally, but have lost perhaps five or ten feet of surface loam throughprocesses of subaerial erosion
. Maryland geological survey . FlG. I.—VIEW SHOWING SUBAERIAL EROSION ON SUNDERLAND-WICOMICO scarp, nearLEONABDTOWN, ST. MARYS FlG. 2.—VIEW SHOWING AMPHITHEATRE AT HEAD OF YOUNG VALLEY IN SUNDERLANDFORMATION, NEAR MORGANZA, ST. MARYS COUNTY. MARYLAND GEOLOGICAL SURVEY 81 its attitude can be secured by comparing the various elevations of itssurface rather than those of its base. Yet it must be taken into accountthat the areas back on the Piedmont Plateau are not as thick as they wereoriginally, but have lost perhaps five or ten feet of surface loam throughprocesses of subaerial erosion. The central portions of the divide insouthern Maryland, however, seems to have lost little or nothing throughthis process. By comparing surface altitudes in various places (PlateXXIII), it has been found that the Lafayette formation was developedas a plain which showed practically no change in elevation from north-east to southwest along the Piedmont border, but had a very gentledecline in a southeasterly direction across the Coastal Plain toward theAtlantic ocean. Between the outliers at Woodlawn and those near ElkNeck, the
Size: 1890px × 1322px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectpaleont, bookyear1901
