Papers by Paul Huddlestun
U.S. Government Printing Office eBooks, Dec 1, 1984
Four sites on DSDP Leg 81 were cored at the southwestern margin of the Rockall Plateau. A composi... more Four sites on DSDP Leg 81 were cored at the southwestern margin of the Rockall Plateau. A composite but discontinuous section from the Holocene to the upper Paleocene was recovered from the cores. This Tertiary section can be divided into three parts: a lower, neritic, sedimentary-volcanogenic sequence in the upper Paleocene and lower Eocene; thin and discontinuous, deep-water, glauconitic chalks from the late Eocene through the early Miocene; and thicker, more continuous sections in the middle Miocene through Holocene. Because of sparsity of planktonic foraminifers in the upper Paleocene and lower Eocene, and because of solution problems in the planktonic foraminifers in addition to the thin and discontinuous sections in the upper Eocene through lower Miocene, the biostratigraphic zonation of this part of the section is incomplete. Thirteen biostratigraphic intervals are described from the upper Paleocene through the Holocene, five from the upper Paleocene through early Miocene, and eight from the middle Miocene through Holocene. Three lineages of planktonic foraminifers are described that have moderately continuous representation in the Rockall Plateau area during the periods of their rapid differentiation: (1) a Globorotalia plexus (middle Miocene) that appears to have originated in G. scitula praescitula, and terminated in G. menardii and G. conoidea in the late Miocene in the Rockall Plateau area; (2) a plexus that originated in G. challenged, and, in the late middle Miocene, evolved into the late Tertiary and Quaternary Neogloboquadrina plexus; and (3) a late Miocene Globorotalia plexus that originated in and included G. scitula scitula, and differentiated into G. scitula scitula and G. margaritae before the end of the late Miocene.
Age and Stratigraphic Correlation of the Raysor Formation, Late Pliocene. South Carolina
Tulane Studies in Geology and Paleontology, 2017
Mollusks and foraminifers from the type section of the Raysor Formation in the Coastal Plain of S... more Mollusks and foraminifers from the type section of the Raysor Formation in the Coastal Plain of South Carolina were obtained from collections in the National Museum of Natural History. Smithsonian Institution, Washington, D.C., and the Charleston Museum, Charleston, South Carolina. Analysis of the molluscan taxa shows the unit to be correlative With the Rushmere and Morgarts Beach Members of the Yorktown Formation in Virginia and North Carolina. Planktic foraminifers in the Raysor indicate an equivalency with Blow's (1969) Zone N20 [= Berggren, et al. (1983) Zone PL3]: this equivalency would suggest that the unit is lower upper Pliocene. The Raysor was deposited on a shallow shelf in a setting that was temperate at first, but which quickly warmed to subtropical.
Late Miocene Glacio-Eustatic Lowering of Sea Level: Evidence from the Choctawhatchee Formation, Florida Panhandle
Lithostratigraphic units are described in terms of their stratigraphic associations. These includ... more Lithostratigraphic units are described in terms of their stratigraphic associations. These include an eastern Gulf of Mexico stratigraphic association, a Gulf Trough stratigraphic association, a Florida Bank stratigraphic association, and an Atlantic continental shelf stratigraphic association. The faunal provinces and the stratigraphic associations appear to be directly related. Four previously named Oligocene formations are recognized in this study: the typical Suwannee Limestone is largely restricted to the Florida Bank stratigraphic association but also occurs north of the Gulf Trough in the central Georgia Coastal Plain, the Cooper Formation is confined to the Atlantic continental shelf stratigraphic association, and the Marianna Limestone and Glendon Limestone of the Vicksburg Group are restricted to the eastern Gulf of Mexico continental shelf stratigraphic association. Of seven new formations, the Ochlockon~ Formation, Wolf Pit Dolostone, Okapilco Limestone, and Bridgeboro L...
The Georgia Geological Survey is presently undertaking a complete reevaluation of the Tertiary st... more The Georgia Geological Survey is presently undertaking a complete reevaluation of the Tertiary stratigraphy of the Coastal Plain of the state. The overall objective is to establish a solid stratigraphic framework for Tertiary sediments within the state, and to be able to correlate with precision and confidence to standard provincial sections in Mississippi, Alabama, and Florida. The first step in this program is to construct a detailed biostratigraphic cross-section along the Savannah River in Screven, Effingham, and Chatham Counties, Georgia (Fig. 1). This paper deals with the Lower Miocene part of this cross-section (Fig. 2). The Lower Miocene section is being reported on separately since beds of this age have not been recognized previously from outcrop or the shallow subsurface in the southeast. The Lower Miocene in eastern Georgia consists of beds that were originally called "Alum Bluff Formation" and Marks Head Marl. Subsequently these units were lumped into what was ...
Introduction Previous work Methods Coring and sampling Analytical techniques-estimations of sedim... more Introduction Previous work Methods Coring and sampling Analytical techniques-estimations of sedimentary components Results Discussion Estimation of recoverable phosphate Summary Acknowledgments References ILLUSTRATIONS Figure 1. Location of Boreholes GAT-90 and GAS-90-2. Figure 2. Preliminary lithologic log for Borehole GAS-90-2 Figure 3. Preliminary lithologic log for Borehole GAT-90 Figure 4. Borehole GAS-90-2 bulk and >170 mesh phosphate Figure 5. Borehole GAT-90 bulk and >170 mesh phosphate and >170 mesh quartz Figure 6. Relationship of estimated >170 mesh phosphate to bulk phosphate and to > 170 mesh quartz for Borehole GAS-90-2 TABLES Table 1. Borehole GAS-90-2 visual estimates on bulk and size separate samples Table 2. Borehole GAT-90 visual estimates on bulk and size separate samples Table 3. Standard Mesh Size Cutoff Openings, in mm and \Lm Table 4. Size separated samples for Borehole GAS-90-2 Table 5. Size separated samples for Borehole GAT-90 Table 6. Phosp...
Size analysis, visual estimation of phosphate and other minerals, and preliminary estimation of recoverable phosphate in size fractions of sediment samples from drillholes GAT-90, Tybee Island, and GAS-90-2, Skidaway Island, Georgia
Open-File Report
Geologic and Biostratigraphic Framework of the Upper Floridan Aquifer in the Greater Savannah Area, Georgia and South Carolina
Correlation and age of the Bridgeboro Limestone, a coralgal limestone from southwestern Georgia
Journal of Paleontology, 1991
The Bridgeboro Limestone, a rhodolith- and coral-bearing limestone in southwestern Georgia, has b... more The Bridgeboro Limestone, a rhodolith- and coral-bearing limestone in southwestern Georgia, has been assigned to the Vicksburgian Stage (Lower Oligocene) of the Gulf Coast based on the occurrence of the bivalves Chlamys (Anatipopecten) anatipes (Morton) and C. (Lyropecten) duncanensis Mansfield. This assignment is further substantiated by the recent recognition of the distinctive bryozoan Tubucellaria vicksburgica Canu and Bassler. The Bridgeboro also contains the larger foraminifera Lepidocyclina (Lepidocyclina) mantelli (Morton), L. (Nephrolepidina) yurnagunensis Cushman, and L. (Eulepidina) undosa Cushman, an assemblage indicative of the Lepidocylina (s.s.) subzone of the Eulepidina Zone of Early Oligocene age. These foraminifera are also characteristic of the Duncan Church beds of the Florida panhandle, and an assemblage of isolepidine and eulepidine Lepidocyclina also occurs in the Glendon Limestone of Alabama. On the basis of larger foraminifera, macroin vertebrates, and physi...
A revision of the lithostratigraphic units of the Coastal Plain of Georgia
Late Miocene Glacio-Eustatic Lowering of Sea Level: Evidence from the Choctawhatchee Formation, Florida Panhandle
The neogene stratigraphy of the Central Florida Panhandle
Ph D Thesis Florida State Univ Tallahassee, Jun 1, 1984
Abstract: Lower Miocene Biostratigraphy Along the Savannah River, Georgia
Emergent Pliocene and Pleistocene Sediments of Southeastern Georgia: An Anomalous, Fossil-Poor, Clastic Section
Quaternary Coasts of the United States, 1992
Quaternary geology of the Atlantic Coastal Plain
Conterminous U.S., 1991
Late Pleistocene paleoclimatology, foraminiferal biostratigraphy and tephrochronology, western Gulf of Mexico
Quaternary Research, 1972
The distribution of planktonic foraminifera has been studied in 28 piston cores of Late Pleistoce... more The distribution of planktonic foraminifera has been studied in 28 piston cores of Late Pleistocene age from the western Gulf of Mexico. Detailed correlation between the cores has been made possible by a high degree of similarity of frequency changes within several species; by coiling direction changes within Globorotalia truncatulinoides; by a datum level representing the near extinction of Globorotalia menardii flexuosa, and Globorotaloides hexagona at the end of the last interglacial; by three distinct volcanic ash horizons, and by calcium carbonate dissolution effects at distinct intervals. Almost all species demonstrate distinct frequency oscillations that are correlatable between cores. A high proportion of these are clearly related to paleoclimatic oscillations and reflect rapidly changing water-mass conditions within the Gulf of Mexico during the latest Pleistocene. No interval appears to have been represented by stable environmental conditions. Causes of frequency changes w...
Pleistocene paleoclimates based on Radiolaria from subantarctic deep-sea cores
Deep Sea Research and Oceanographic Abstracts, 1971
Abrupt climatic change at 90,000 yr BP: Faunal evidence from Gulf of Mexico cores
Quaternary Research, 1972
Planktonic foraminiferal studies have been carried out on 28 piston cores of late Pleistocene age... more Planktonic foraminiferal studies have been carried out on 28 piston cores of late Pleistocene age from the western Gulf of Mexico, an area of high sedimentation rates. For the interval between 73 × 103 and 95 × 103 yr BP, two of these cores have sedimentation rates of 12 and 15 cm/1000 yr. Calculation of the speed of faunal changes within this interval reveals an extremely rapid paleoclimatic-paleooceanographic change at approximately 90 × 103 years BP. Several species including distinctly warm-sensitive forms, then disappeared from the Gulf of Mexico in less than 350 yr, leaving a depleted planktonic foraminiferal fauna greatly dominated by only three species with little apparent temperature preference. This fauna existed for 2.5 × 103 yr after which distinctly cooler water elements increased in abundance rapidly and formed a high frequency peak approx 83.5–85 × 103 years BP. This increase in cooler water elements reflects either a return to more stable environmental conditions or ...
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Papers by Paul Huddlestun