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The AAPG/Datapages Combined Publications Database
Showing 616 Results. Searched 196,360 documents.
Palynology and Age of Beaverhead Formation and Their Paleotectonic Implications in Lima Region, Montana-Idaho
Robert T. Ryder , H. Tate Ames
AAPG Bulletin
...). Triporate forms in that study tapered off from 15-20 percent to 5 percent of the sample total at the Turonian-Coniacian boundary. Although this percentage...
1970
Morphology of Ocean Basin Seaward of Northwest Africa: Canary Islands to Monrovia, Liberia
Julius Egloff
AAPG Bulletin
... Africa and extends from the base of the continental slope as a thick wedge of sediment (Fig. 2). The rise appears arched and tapered toward the northwest...
1972
Shallow and Deepwater Stromatolites in Lower Proterozoic Platform--to--Basin Facies Change, Great Slave Lake, Canada
Paul Hoffman
AAPG Bulletin
... low and tapered. This is related (Hoffman, 1967) to the general outhward (basinward) transport of sediment (Fig. 5). Columnar stromatolites have...
1974
Oil and Gas Developments in Western Canada in 1988
M. H. Portigal , R. M. Creed , J. R. Hogg , M. D. Hewitt
AAPG Bulletin
...). The average depth dropped 1.5% from 1,228 m in 1987. Drilling activity was especially strong during the first half of 1988, but tapered off toward...
1989
Paleostress analysis from image logs using pinnate joints as slip indicators
Alfred Lacazette
AAPG Bulletin
... at the fault and die-out in the host rock, they should be visibly tapered if both the fault intersection and the end of the joint are cut by the borehole...
2009
Computer modeling bioturbation: The creation of porous and permeable fluid-flow pathways
Andrew D. La Croix, Murray K. Gingras, Shahin E. Dashtgard, S. George Pemberton
AAPG Bulletin
... in computer graphics and design) that tapers to 1 cm (0.4 in.). The horizontal distance from the center of the half circle to the tapered tip is 25 cm...
2012
Coiled-Tubing-Assisted Hydraulic Fracturing of CBM Wells in India Using CT-Deployed Hydrajet Perforation Technology; #41072 (2012)
Ajay Sharma, Dushyant Bhalla, and Sumit Bhat
Search and Discovery.com
... direction—from the annulus to the CT. While pumping down the CT, the ball presses against a tapered seat, creating a positive seal and not allowing flow...
2012
Diagenesis and Isotopic Evidence of Porosity Evolution in Reef Reservoir-Analog Facies in Outcrops of the St. Joe Group (Kinderhookian to Basal Osagean) in SW Missouri and NW Arkansas; #50890 (2013)
Beau Morris, Sal Mazzullo, and Brian White
Search and Discovery.com
... Dislodged reef blocks within the Compton Formation along the eastern side of Highway DD near Noel, Missouri have an apparent tapered and pinched...
2013
The Three Elements of Structural Geology Part 3, #41849 (2016).
Terry Engelder
Search and Discovery.com
... Set 2.2.1 2.2.2 2.2.3 2.2.4 2.2.5 Veins Transitional-Tensile Fracture Shear Failure Friction: Critically Stressed Earth The Tapered Wedge 3.1.1 3.1.2...
2016
Ultrastructure of enigmatic phytoclasts (banded tubes) from the Silurian Lower Devonian: Evidence for affinities and role in early terrestrial ecosystems
Wilson A. Taylor, Charles H. Wellman
PALAIOS
...), but we discount these reports and suggest that they represent fortuitous positioning of two or more individual tubes. There are also reports of tapered...
2009
The Paleocene Eocene thermal maximum: New data on microfossil turnover at the Zumaia section, Spain
Laia Alegret, Silvia Ortiz, Xabier Orue-Etxebarria, Gilen Bernaola, Juan I. Baceta, Simonetta Monechi, Estibaliz Apellaniz, Victoriano Pujalte
PALAIOS
... (ϳ54%–63%) morphogroups (Fig. 4). Infaunal morphogroups mainly consist of elongated-tapered (e.g., laevidentalinids, Spiroplectammina navarroana...
2009
Depositional Depth of Laminated Carbonate Deposits: Insights From the Lower Cretaceous Valdeprado Formation (Cameros Basin, Northern Spain)
I. Emma Quijada, Pablo Suarez-Gonzalez, M. Isabel Benito, Ramón Mas
Journal of Sedimentary Research (SEPM)
... to curlicue configurations as well (Cowan and James 1992). They can be uniformly open top to bottom, tapered up or tapered down, or dilated only along...
2013
Depositional Controls On Mudstone Lithofacies In A Basinal Setting: Implications for the Delivery of Sedimentary Organic Matter
Sven F. Könitzer, Sarah J. Davies, Michael H. Stephenson, Melanie J. Leng
Journal of Sedimentary Research (SEPM)
.... The lenses have clear outlines with prominent tapered ends. Some larger examples comprise several lenses that are grouped together (Fig. 5C), and individual...
2014
TAPHONOMY AND BIOLOGICAL AFFINITY OF THREE-DIMENSIONALLY PHOSPHATIZED BROMALITES FROM THE MIDDLE ORDOVICIAN WINNESHIEK LAGERSTÄTTE, NORTHEASTERN IOWA, USA
ANDREW D. HAWKINS, HUAIBAO P. LIU, DEREK E. G. BRIGGS, A D. MUSCENTE, ROBERT M. MCKAY, BRIAN J. WITZKE, SHUHAI XIAO
PALAIOS
.... PA L A I O S FIG. 3.—Reflected light images (A–M) and BSE image (N) of bromalites. A) Specimen exhibiting a tapered neck feature: SUI 145144 (WL61). B...
2018
The Trace Fossil Tisoa Siphonalis in its Type AreaCharacteristics and Environmental Significance
Andreas Wetzel, Jean-Philippe Blouet
PALAIOS
... of a mollusk (see also de Serres 1842; Chenu 1859): ‘‘Oval body generally swollen in its middle part and slightly tapered at both ends, imitating well...
2023
How submarine channels (re)shape continental margins
Luke A. Pettinga, Zane R. Jobe
Journal of Sedimentary Research (SEPM)
... toward zero degrees. Type 4. Tapered, low-gradient profiles: These profiles have maximum gradients < 5 degrees and typically have the highest gradients...
2020
Conodonts from the Lower Griesbachian Otoceras Latilobatum Bed of Selong, Tibet and the Position of the Permian—Triassic Boundary
M. J. Orchard, W. W. Nassichuk, Lin Rui
CSPG Special Publications
... with conodonts. Diagnosis: A Neogondolella with an elongate-oval shaped platform, mostly rounded posterior outline and evenly tapered, variably upturned...
1994
Cyclostratigraphy and Chronology of the Albian Stage (Piobbico Core, Italy)
Alessandro Grippo, Alfred G. Fischer, Linda A. Hinnov, Timothy D. Herbert, Isabella Premoli Silva
Special Publications of SEPM
.... Power Spectra In order to obtain a more objective view of the cyclicities we turn to the frequency domain of power spectra. We employed tapered Thomson...
2004
Allostratigraphy of the Kaskapau Formation (Cenomanian–Turonian) in the subsurface and outcrop: NE British Columbia and NW Alberta, Western Canada Foreland Basin
Bogdan L. Varban, A. Guy Plint
CSPG Bulletin
... and III show the highest rate of tapering (thinning by 96%, 99% and 92%, respectively), whereas units IV and V are less tapered (thinning by 82% and 80...
2005
Paleoredox Conditions of Early Carboniferous Upper Bakken Shale, Williston Basin
Dipanwita Nandy, Sanyog Kumar, Steve Sonnenberg
Unconventional Resources Technology Conference (URTEC)
...). They are cylindrical in shape with tapered ends and 100-500 μm in length. Facies F2 is the most abundant facies type in the UBS and makes up about 75% of the entire UBS...
2021
Foraminiferal Zonation in Matanuska Formation, Squaw Creek-Nelchina River Area, South-Central Alaska
Harlan R. Bergquist
AAPG Bulletin
... a gradation into the typical tapered forms of M. oxycona. The recent placement of the genus Marssonella under Dorothia (Trujillo, 1960, p. 309) may have...
1961
Bottom-sampling Apparatus: Part 7. Methods of Study
Jack L. Hough
AAPG Special Volumes
... made the bit pointed in order to effect greater penetration and tapered the top of the collecting cylinder so as to facilitate withdrawal...
1939
Cyanobacteria from the Big A Butte Member of the Supai Formation (Lower Permian) in the Holbook Basin of Arizona: Indications of a Fresh to Brackish Water Depositional Environment; #51647 (2020)
Karl W. Schwab, Michael A. Smith, Carmon D. Bonanno
Search and Discovery.com
... sheaths and the cell cross-walls are generally not constricted (some may show a slight constriction). The filaments are sometimes tapered...
2020
The Oil Fields of Russia: Chapter 13 - Theory and Practice of Liquid Fuel, and Notes on Petroleum Gas
Arthur Beeby Thompson
Other Technical
...�fuel Burner. be,made to approach or r_ecede from a tapered mouth given to the interior of the outer casing, thereby producing an annular orifice which...
1908
Geology of the Brevard fault zone and related rocks of the inner Piedmont of Alabama. (1970) Road Log
Robert D. Bentley, Thornton L. Neathery
Alabama Geological Society
... subsequently broken. These clasts often show a flexion structure - most are tapered on the ends, some are spindle-shaped. There is a general lineation...
1970