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The AAPG/Datapages Combined Publications Database
Showing 3,219 Results. Searched 200,630 documents.
Marcasite in Black Shales—a Mineral Proxy for Oxygenated Bottom Waters and Intermittent Oxidation of Carbonaceous Muds
Juergen Schieber
Journal of Sedimentary Research (SEPM)
... and is closely associated with irregular patches of pyrite microcrysts and remnant spherical shapes consisting of pyrite microcrysts (Fig. 2A). Features...
2011
Early Diagenetic Silica Deposition in Algal Cysts and Spores: A Source of Sand in Black Shales?
Jurgen Schieber
Journal of Sedimentary Research (SEPM)
... of compaction, a small proportion are filled with diagenetic silica. The latter are spherical to ellipsoidal (0.1-0.5 mm), and filled with chalcedony, microquartz...
1996
Evolution of Late Paleoproterozoic Ramp Systems, Lower Mcnamara Group, Northeastern Australia
Terry T. Sami, Noel P. James, T. Kurtis Kyser, Peter N. Southgate, M. Jim Jackson, Rod W. Page
Special Publications of SEPM
... crossstratification ripple crossstratification low angle cross stratification parallel lamination wave IV and interference ripples domal stromatolites...
2000
Chapter 6: Parasequence Sets and Depositional Sequences
K. M. Bohacs, O. R. Lazar, J. D. Ottmann
AAPG Special Volumes
... of well-preserved, spherical cysts filled with early diagenetic chalcedony (white arrow) or pyrite (green arrow). HST = highstand systems tract; TST...
2022
Spatial Variability of Porosity in Chalk: Comparison of an Outcrop and a North Sea Reservoir
P. Frykman
AAPG Special Volumes
...- to Intermediate-scale VarianceThe model for the vertical semivariogram includes a spherical structure with range 0.20 m (0.66 ft), which accounts for 35...
2006
Morphology of Hydrocarbon Droplets During Migration: Visual Example from the Monterey Formation (Miocene), California
Neal R. O'Brien , Geoffrey D. Thyne , Roger M. Slatt
AAPG Bulletin
... pathways themselves. The small (5-10 µm) diameter droplets are observed to have various shapes that include spherical droplets, amalgamated droplets...
1996
Systematic ichnology of the Mabou and Cumberland groups (Carboniferous) of western Cape Breton Island, eastern Canada, 1: burrows, pits, trails, and coprolites
Dave G. Keighley, Ron K. Pickerill
Atlantic Geology
... that resemble at least one full sine or clothoid wave. Successive waves may gradually diminish in amplitude (m odified from Hitchcock, 1858; Hantzschel...
1997
Sedimentary Characteristics of the Gravel–Sand Transition in the River Rhine
Roy M. Frings
Journal of Sedimentary Research (SEPM)
...-sounding measurements in the area around the Pannerdensche Kop bifurcation during the 1998 discharge wave. Wilbers and Ten Brinke (2003) determined...
2011
Carbonates and associated sedimentary rocks of the Upper Viséan to Namurian Mabou Group, Cape Breton Island, Nova Scotia: evidence for lacustrine deposition
T. L. Crawford
Atlantic Geology
... Mabou River #1 section are well-rounded, spherical to elliptical, and appear to have undergone compaction, evident by a spastolithic texture (Fig. 9...
1995
Sequence Stratigraphy of the Scottish Laurentian Margin and Recognition of the Sauk Megasequence
Robert J. Raine, M. Paul Smith
AAPG Special Volumes
... is most common at the base of the member, but occurs throughout. The most common facies is composed of wave-rippled siltstones, mudstones, and echinoderm...
2012
Lithologic Analysis of Sedimentary Rocks
Robert P. McNeal
AAPG Bulletin
... in the behavior of low and high sphericity in the transporting medium. Spherical particles are more easily transported by traction, and those of low...
1959
Improved Data Analysis and Interpretation Method for Laboratory Determination of Crushed-Sample Shale Gas Permeability
F. Civan, D. Devegowda, R. Sigal
Unconventional Resources Technology Conference (URTEC)
... formulation of Civan et al. (2012) is now extended for application to transport of gas in spherical-shape crushed rock samples. First, Eq.(3...
2013
Experimental Classification of Solid Carbonate Rocks on a Basis of Microscopic Organic Remains
I. V. Chubinidze
Petroleum Geology: A Digest of Russian Literature
... of planktonic foraminifera there are also radiolaria and spherical remains of probable organic origin; the latter could also be radiolaria. Upward...
1965
Chamosite Oolites in the Devonian of Pennsylvania
Richard A. Sheppard, Ralph E. Hunter
Journal of Sedimentary Research (SEPM)
... as oolites by their nuclei and concentric structure and by their spherical form where protected from flattening after deposition. Broken oolites serving...
1960
Theory of Sieving: NOTES
Basanta K. Sahu
Journal of Sedimentary Research (SEPM)
... be conveniently classified into two groups; ellipsoidal (spherical) grains (Case I) and tabular grains (Case II). The tabular grains are further...
1965
Quiet Water Oolites from the Ordovician of Minnesota: NOTES
Richard A. Davis, Jr.
Journal of Sedimentary Research (SEPM)
... in which nuclei are not recognizable are mostly well sorted and spherical. Most recognizable nuclei are quartz grains, but some are rounded intraclasts...
1966
Modern Armored Mud Balls in an Urban Environment
Richard W. Ojakangas, Joyce A. Thompson
Journal of Sedimentary Research (SEPM)
... and armored. Spherical, subspherical, cylindrical, and elliptical shapes were observed. BELL, H. S., 1940, Armored mud balls: Their origin, properties...
1977
The Curious Case of Hydrocarbon-Expulsion Fractures: Genesis and Impact on the Bakken Shales; #80398 (2014)
Mohammed Duhailan, Steve Sonnenberg
Search and Discovery.com
... are naturally fractured and can be interpreted on resistivity-curve separation. The Three Forks and Middle Bakken pressure-transient behaviors show spherical...
2014
Carbonate Buildups in the Geologic Record: A Review
Philip H. Heckel
Special Publications of SEPM
...~ltai~litlg growtll in t11c zotlc o[ waves, Necd for wave resist;urcc i l l reels v;irics Troiri one ei~viroi~tne~lt;unotlrcr; w;tye resist;litcc tn;ly...
1974
Facies, stratigraphy, and evolution of a middle Ediacaran carbonate ramp: Khufai Formation, Sultanate of Oman
Magdalena Osburn, John Grotzinger, and Kristin Bergmann
AAPG Bulletin
... is characterized by outer-ramp facies with little evidence for storm-wave reworking, whereas the upper Khufai Formation is characterized by peritidal and supratidal...
2014
The Caballos Novaculite Revisited: Part II: Chert and Shale Members and Synthesis
Earle F. Mcbride, Robert L. Folk
Journal of Sedimentary Research (SEPM)
... abundant as 15%; some are spherical, others are flattened by compaction. Radiolaria are filled by the same type of jigsaw puzzle coarse microquartz...
1977
Stratigraphy and Paleoenvironments of Cretaceous Rocks, Mitchell Quadrangle, Oregon
W. D. Wilkinson , Keith F. Oles
AAPG Bulletin
... rocks of the area. Most are found in the transition zones at the tops of the Gable Creek tongues. Locally there are short-wave-length oscillation...
1968
Crustose Coralline Algae from the Flower Garden Banks, Northwestern Gulf of Mexico: Controls on Distribution and Growth Morphology
Gregory A. Minnery
Journal of Sedimentary Research (SEPM)
... of shape, internal structure, and composition, rhodoliths are divided into an upper zone (where they have a spherical shape with concentric laminae...
1990
Petrography of Algal Bioherms in Burnt Bluff Group (Silurian), Wisconsin
J. William Soderman, Albert V. Carozzi
AAPG Bulletin
... aggregates, and pyrite, is a dolomitized calcilutite which was deposited below wave base. Microfacies 2 represents a shallower environment...
1963
Subaerial Exposure Environment: Chapter 1: PART 2
Mateu Esteban, Colin F. Klappa
AAPG Special Volumes
... of organic borings of coastal organisms reduces the diagnostic value of collapse breccia since bioerosion and wave action at the base of coastal cliffs...
1983