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OVERVIEW OF THE MARINE TERTIARY AND QUATERNARY DEPOSITS BETWEEN CAPE FEAR AND CAPE LOOKOUT, NCFigure 3. A. Isopach of Lutetian and Bartonian sediments onthe Onslow Block between the axis of the Cape Fear Arch andthe Neuse Hinge. Note that outliers occur on the Onslow Block(modified from Harris and Laws, in press). B. Isopach of Priaboniansediments on the Onslow Block between the axis of theCape Fear Arch and the Neuse Hinge (modified from Harrisand Laws, in press).is included in this section for discussion. The youngersequence (TA4.2 or TA4.3) is exclusively Priabonian in ageand has a more restricted spatial distribution. Both sequencesconsist predominantly of. bryozoan, sponge and molluscanbiomicrite and biomicrudite except along the northern part ofthe Onslow Block. Along the Neuse Hinge, the New BernFormation that represents either the TA4.2 or TA4.3sequence consists of sandy pelecypod-mold biosparite andbiosparrudite.Oligocene/Early MioceneFigure 4. A. Isopach of Reupelian sediments on the OnslowBlock between the axis of the Cape Fear Arch and the NeuseHinge (modified from Harris and Laws, in press). B. Isopach ofChattian sediments on the Onslow Block between the axis ofthe Cape Fear Arch and the Neuse Hinge (modified from Harrisand Laws, in press).One Rupelian, several? Chattian and one Aquitaniansequence are recognized between Brunswick and CarteretCounties (Fig. 1). The Rupelian sequence (TA4.4) is representedby the Trent Formation of Baum et al. (1978), theChattian sequences (TB1.1-1.4) by the Belgrade/SilverdaleFormations, and the Aquitanian part of sequence TB 1 .4 bythe Crassostrea channel deposits of Baum et al. (1978) andZullo and Harris (1987).Rupelian (Figure 4a)The Trent Formation is confined to the area between theNew and Neuse Rivers. In the vicinity of the Neuse Hinge itconsists of three ascending lithofacies; sandy echinoid biosparite,sandy pelecypod-mold biomicrudite and barnacle,pelecypod-mold biosparrudite. To the south near Jacksonvilleit consists of sandy foraminiferal silt and silty clay. Thissequence is assigned to the TA4.4 cycle based on the occurrenceof the barnacle Lophobalanus kellumi and the pectinid3
W. Burleigh HarrisChlamys trentensis (Zullo and Harris, 1987), mollusks thathave early Vicksburgian (Rupelian) affinities (Rossbach andCarter, 1991), foraminifers indicative of the Globergerinaampliapertura Zone (P19/20) (Zarra, 1989), and calcareousnannofossils indicative of zones NP21-22 (Worsley andTurco, 1979).Chattian-Aquitanian (Figure 4bThe Chattian Belgrade and Silverdale Formations arerestricted to quarries and core holes from about the NewRiver in Onslow County northward through eastern Jones,Craven and Carteret Counties. Chattian sequences are alsowell developed in Onslow Bay (Snyder et al., 1991). TheAquitanian Crassostrea channel deposits are only foundwithin a few kilometers north and south of the White OakRiver. The Belgrade Formation consists of about 8 m ofsandy, pelecypod-mold biomicrudite with minor interbeds ofquartz sand. The Silverdale Formation consists of about 3 mof mollusk- rich quartz sand, which is occasionally lithifiedand moldic. It occurs downdip (eastward) of the BelgradeFormation and is considered equivalent in age. Calcareousnannofossils (Laws and Worsley, 1986; Laws, 1992; Parkerand Laws, 1991), planktonic Foraminifera (Zarra, 1989), andmegafauna indicate that the Belgrade and Silverdale Formationsspan planktonic foraminiferal zones P21 and P22(Zullo and Harris, 1987). The Belgrade and Silverdale Formationswere suggested by Zullo and Harris (1987) to representfour depositional sequences ranging in age fromChattian to Aquitanian (TB1. 1-lower part of 1.4). TheAquitanian Crassostrea channel deposits were interpreted byZullo and Harris (1987) to represent the highstand of theTB1.4 sequence.Figure 5. Late Tertiary and Quaternary lithostratigraphy ofthe Onslow Block.foraminifers, calcareous nannofossils, diatoms and radiolarians,the three Miocene depositional sequences were dated bySnyder et al. (1991) as Burdigalian (Frying Pan Sequence),Langhian (Onslow Bay Sequence), and Serravallian (BogueBanks Sequence).MioceneMiocene sediments onlap the emerged Coastal Plainalong a north-south line that approximates the White OakRiver and are referred to the Pungo River Formation (Snyderet al., 1991) (Figs. 5 and 6). The Pungo River Formation isbest developed on the Albemarle Block and in Onslow Bay.Based on seismic analysis, Miocene sediments are interpretedto represent three unconformity bounded packagesidentified as the Frying Pan, Onslow Bay and Bogue BanksSequences. Lithofacies of the Frying Pan Sequence includemuddy, quartzitic phosphatic sand; organic-rich, phosphaticmud; and molluscan-barnacle shell gravels interbedded withquartz sand or foraminiferal quartz sand (Riggs and Mallette,1990). The Onslow Bay Sequence consists of calcareousmuds and biogenic sands and gravels with varying amountsof siliciclastic sand and chert (Riggs and Mallette, 1990).The Bogue Banks Sequence consists mainly of siliciclasticmuds and sands; the sands usually contain minor phosphateand the muds usually contain abundant silt-sized dolomite(Riggs and Mallette, 1990). Based on study of planktonicFigure 6. Distribution of Miocene sediments on the OnslowBlock (modified from Brown et al. 1974, and Snyder et al.,1991)PliocenePliocene units in North Carolina are referred to as theDuplin/Yorktown Formations and the Bear Bluff/ ChowanRiver Formations (Figs. 5, 7a and 7b). The Yorktown Formationis usually used for lower and lower upper Pliocene sedimentsthat occur north of the Neuse Hinge on the AlbemarleBlock (Ward et al., 1991). The Duplin Formation is used forage equivalent sediments that occur south of the NeuseHinge on the Onslow Block. The Chowan River Formation is4
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Page 46 and 47: William J. ClearyPHOLOGYFigure 2. A
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Lynn A. LeonardFigure 5. Deposition
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Lynn A. LeonardFigure 9. Surficial
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CAROLINA GEOLOGICAL SOCIETYGuideboo
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SHORELINE STABILIZATION IN ONSLOW B
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SHORELINE STABILIZATION IN ONSLOW B
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WILLIAM A. DENNISrestored), a museu
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WILLIAM A. DENNISeffective in erosi
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WILLIAM A. DENNISFigure 5. View of
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WILLIAM A. DENNISsurvey, and two po
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WILLIAM J. CLEARY AND ORRIN H. PILK
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Appendix 2. Post Hurricane Bertha (
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Appendix 4. Post Hurricane Bertha.
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Appendix 6. Post Hurricane Fran (9/
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Appendix 8. Post Hurricane Fran (9/
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