Introduction, __ ________________________________ General discussion________________________ _______ Structural configuration of the coastal margin________ Regional system of intersecting hingebelts and its relation Lo sediment distribution. ____________ Structurr 1 models. __________________________ Analysis of the mechanics of deformation____________ Regional components. tilt_ _ _____________________ The geographic distribution of sedimentary troughs and the nature of their structural boundaries and cross structures between North Carolina and Long Island, N.Y.__ ____________________ The geometry of sedimentary troughs, first-order tectonic stage._____________________________ The geometry of sedimentary troughs, secondorder tectonic stage_-___-__-_-________-____ Stratigraphic framework._____________________________ General discussion and review.____________________ Correlation framework____________________________ Construction of geologic maps and cross sections. ____ Lithostratigraphic description and biostratigraphic discussion of regional chronostratigraphic units_ Mesozoic Era________________________________ Jurassic(?) System Rocks of Jurassic(?) age._____________________________ Unit I Rocks of Unit !_____________. Jurassic(?) and Cretaceous Systems Rocks of Cretaceous and Late Jurassic(?) age_ ______________________________
Upper Miocene and Pliocene(?) outcrop samples from North Carolina and Virginia yielded 63 species and seven subspecies of Ostracoda. The stratigraphic distribution of the species indicates the presence of an assemblage, the Aurila conradi-Thaerocythere schmidtae assemblage, that also extends into the Pliocene in southern North Carolina and South Carolina. A subassemblage, the Radimella cvnfragosa subassemblage, represents the upper Miocene and Pliocene in southern North Carolina and in South Carolina. T. schmidtae appears to represent a cooler water subassemblage of the upper Miocene in northern North Carolina, Virginia, and southernmost Maryland. Two new genera, two new species, and one new subspecies are described herein. The new genera are Prodictyocythere, n. gen., and Shattuckocythere, n. gen. The new species are Murrayina macleani, n. sp., and Prodictyocythere trapezoidalis, n. sp. The new subspecies is Pontocythere agricola duopunctata, n. subsp. OSTRACODA FROM DEPOSITS OF PLIOCENE(?) AGE Three collections obtained by Thomas G. Gibson are possibly of Pliocene age. These are: (1) in the upper part of a bluff 150 yards south of Colerain Landing on the western bank of Chowan River, Bertie County, N.C. (Gibson's samples G-l and G-3 in ascending order), (2) in bluff at a point 200 yards south of Colerain Landing (Gibson's samples F-l to F-5 in ascending order), (3) Mount Gould Landing on western bank of Chowan River, Bertie County, N.C. The species of ostracodes from these Pliocene (?) deposits are listed in table 1. The following species from the Pliocene (?) localities in table 1 have not been recorded in this area in deposits as old as Miocene: Cytherura cf. C. gibba Miiller, 1785 Xestoleberis cf. X. aurantia (Baird, 1838) The remaining species from the Pliocene (?) also occur in the Miocene of this region. Lithologically the Pliocene (?) beds at the two localities mentioned above are darker brown in color and are more of a shell hash than is the Yorktown Formation in this area. OSTRACODA OF THE YORKTOWN FORMATION UPPER YORKTOWN 'Beds of Pliocene (?) age at Mount Gould Landing and Colerain Landing localities, Bertie County, N.C. 2 Species obtained from the Duplin Marl in the present collection. 3 Occurrence of Cletocythereis mundorffi subsp.
This paper describes and illustrates 91 species of Recent Ostracoda from the Gulf of California; 42 species are newly described, 34 are previously described, and 15 are not given specific assignment.Based on the collections studied here the following distributional associations of Gulf of California Ostracoda are noted:1. Species generally distributed in the Gulf but occurring mainly nearshore in water less than 50 fathoms deep and on sandy mud or sand bottoms; or if present offshore, occurrences are in central and northern parts of Gulf in water up to several hundred fathoms deep and on sandy mud or mud bottom: 35 species.2. Species restricted to nearshore localities in water less than 50 fathoms deep, on sand or sandy mud bottoms, and on both sides of Gulf: 17 species.3. Species restricted to eastern marginal part of Gulf in water less than 50 fathoms deep and on sand, sandy mud, or muddy sand bottom: 7 species. 4. Species restricted to western marginal part of Gulf in water less than 50 fathoms deep, on sand, sandy mud, or muddy sand bottom: 15 species. 5. Species restricted to southern part of Gulf, offshore, in water down to 1,655 fathoms and on mud bottom: 1 species.6. Species restricted to northern part of Gulf, offshore, in water down to 488 fathoms and on mud bottom: 3 species. 7. Species restricted to southwestern part of Gulf, nearshore, in waters less than 50 fathoms, and on sand or sandy mud bottom: 4 species. 8. Species restricted to southeastern part of Gulf, nearshore, in water less than 50 fathoms, and on sand or sandy mud bottom: 4 species. 9. Species characteristic of nonmarine or brackish water environments but in some instances found in offshore bottom sediments as a result of having been rafted on floating vegetation or other process of transportation: 7 species.The possible sources of the ostracode fauna and migration paths of the species are briefly discussed. 1 on June 23, 2015 memoirs.gsapubs.org Downloaded from on June 23, 2015 memoirs.gsapubs.org Downloaded from on June 23, 2015 memoirs.gsapubs.org Downloaded from 1 A number of other stations examined (Fig. lb) yielded no Ostracoda. The upper centimeter of each of the core samples was preserved in neutralized formalin and returned to Scripps Institution, where, in F. B.Phleger's laboratory they were stained with Rose Bengal solution for detection of living specimens, sieved free of clay, and studied for Foraminifera. After the foraminiferal counts had been made, about 200 of the 241 marine samples obtained on the 1959 cruise were studied for ostracode distribution. The species were subsequently described and illustrated.The illustrations of the species have been arranged on the plates and in the text to conserve as much space as possible. They are in neither biological nor alphabetical order.References cited in the synonymies are not included in "References Cited" unless used in "Relationships" (new species) or "Remarks" (old species).on June 23, 2015 memoirs.gsapubs.org Downloaded from on June 23, 2015 memoirs.gsapubs.org Downloaded f...
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