. Bulletins of American paleontology. Paleontology; Paleontology; Paleontology. Bulletin 327 Cyclicity in the Gulf Coastal Plain has long been recognized (Stephenson, 1928). Lowman (1949), ob- jecting to the use of a time-stratigraphic classification, suggested that the stratigraphic framework of that area be defined in terms of regional transgressive-regressive features. Both Lozo and Stricklin (1956), and Young (1963) describe and use this cyclicity in their classifi- cations of the Cretaceous rocks of Texas; Fisher (1964), using depositional patterns, classified the Eocene rocks of the nort
. Bulletins of American paleontology. Paleontology; Paleontology; Paleontology. Bulletin 327 Cyclicity in the Gulf Coastal Plain has long been recognized (Stephenson, 1928). Lowman (1949), ob- jecting to the use of a time-stratigraphic classification, suggested that the stratigraphic framework of that area be defined in terms of regional transgressive-regressive features. Both Lozo and Stricklin (1956), and Young (1963) describe and use this cyclicity in their classifi- cations of the Cretaceous rocks of Texas; Fisher (1964), using depositional patterns, classified the Eocene rocks of the northern Gulf Coastal Plain; and Colquhoun (1969, 1971, 1974) embraces a similar viewpoint in his classification of the Atlantic Coastal Plain sedi- ments of South Carolina. In these studies, the defined cyclic units were described as standard stratigraphic formations. Until recently, Atlantic Coastal Plain Pleistocene formations were determined on the basis of physiographic features such as scarps (Colquhoun, 1974). As Oaks and DuBar (1974, table 5, p. 7) point out, since 1950 there has been a significant change from a "terrace-formation" to a standard stratigraphic for- mation concept, with geomorphic expression as one of many criteria. As indicated by Colquhoun (1971, 1974), the most consistent and unifying feature of Pleistocene Coastal Plain sediments is the transgressive-regressive nature of these sediments. The imprint of these diachronous events is the most effective means of clustering local stratigraphic elements into mappable units in south- eastern Virginia. il TAN X-BEDDED SAND H WORM TUBE BIOHERM U ^ 11 COARSE SD. & PEBBLES n STIFF SILTY CLAY ^,>?>x (J X X QgRay sand m fossils ? clay. Text-figure 2. —Fence diagram representing the Greenbrier Pit (locality 25), showing complex facies relationships within a small Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - color
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