Charles A Sandberg (Former Employee)
Science and Products
Filter Total Items: 43
Late Devonian sea-level changes, catastrophic events, and mass extinctions Late Devonian sea-level changes, catastrophic events, and mass extinctions
Late Devonian history is explained through event stratigraphy comprising a sequence of 18 sea-level changes, catastrophic events, and mass extinctions. Generally rising sea level during the initial Frasnian Stage, beginning with the Taghanic onlap and ending with a sea-level fall and major mass extinction, was interrupted by several exceptionally rapid, very high rises of sea level...
Authors
Charles Sandberg, Jared R. Morrow, W. Ziegler
Utility of palmatolepids and icriodontids in recognizing Upper Devonian Series, Stage, and possible substage boundaries Utility of palmatolepids and icriodontids in recognizing Upper Devonian Series, Stage, and possible substage boundaries
Conodonts are accepted internationally to define Devonian Series and Stage boundaries. Hence, the evolution and taxonomy of pelagic palmatolepids, primarily Palmatolepis and its direct ancestor Mesotaxis, and shallow-water icriodontids, Icriodus, Pelekysgnathus, and "Icriodus", are the major tools for recognizing subdivisions of the Upper Devonian. Palmatolepids are the basis for the...
Authors
W. Ziegler, Charles Sandberg
A late Frasnian (Late Devonian) radiolarian, sponge spicule, and conodont fauna from the Slaven Chert, northern Shoshone Range, Roberts Mountains allochthon, Nevada A late Frasnian (Late Devonian) radiolarian, sponge spicule, and conodont fauna from the Slaven Chert, northern Shoshone Range, Roberts Mountains allochthon, Nevada
Co-occuring conodonts, radiolarians, and sponge spicules from the type locality of the Slaven Chert, northern Shoshone Range, Nevada, indicate that the radiolarian and sponge spicule assemblage described herein correlates with the Late rhenana conodont Zone (late Frasnian). The moderately well preserved radiolarians are the first Frasnian-age fauna described from the Western Hemisphere...
Authors
S. Q. Boundy-Sanders, Charles Sandberg, B.L. Murchey, A. G. Harris
Alamo megabreccia: Record of a late devonian impact in southern Nevada Alamo megabreccia: Record of a late devonian impact in southern Nevada
The Alamo breccia is probably the most voluminous known outcropping carbonate megabreccia. It occupies ~4000 km2 across 11 mountain ranges in southern Nevada, has an average thickness of ~70 m, and contains a volume of 250+ km3. The breccia is a single bed, of early Frasnian (early Late Devonian) age, that formed in the wake of a giant slide that deposited a lower chaotic debrite...
Authors
John E. Warme, Charles Sandberg
Mississippian stratigraphic framework of east-central California and southern Nevada with revision of Upper Devonian and Mississippian stratigraphic units in Inyo County, California Mississippian stratigraphic framework of east-central California and southern Nevada with revision of Upper Devonian and Mississippian stratigraphic units in Inyo County, California
No abstract available.
Authors
Calvin H. Stevens, Darrell S. Klingman, Charles A. Sandberg, Paul Stone, Paul Belasky, Forrest G. Poole, J. Kent Snow
Devonian conodont biochronology in geologic time calibration Devonian conodont biochronology in geologic time calibration
The conodont-based biochronology of the Devonian Period is calibrated herein on the basis of: (1) a recent, reliable radiometric dating (CLAQUE??-LONG et al. 1992) of a stratigraphic position just above the Devonian-Carboniferous boundary; and (2) new calculations of stage durations based on our estimates and those of a large number of other Devonian workers, which pertain to many...
Authors
Charles Sandberg, W. Ziegler
Reflexions on Frasnian and Famennian stage boundary decisions as a guide to future deliberations Reflexions on Frasnian and Famennian stage boundary decisions as a guide to future deliberations
The pros and cons of the three conodont-based boundaries of the Frasnian and Famennian Stages and their corresponding GSSPs (Global Stratotype Section and Point) are evaluated in terms of current taxonomic, biostratigraphic, and sedimentologic knowledge. Two of these boundaries are based on easily identified pelagic species, which provide excellent bases for global correlation. The third...
Authors
W. Ziegler, Charles Sandberg
A Devonian/Carboniferous conodont database documentation and user's manual A Devonian/Carboniferous conodont database documentation and user's manual
No abstract available.
Authors
Ronald R. Charpentier, Charles A. Sandberg
A Devonian/Carboniferous conodont database documentation and user's manual A Devonian/Carboniferous conodont database documentation and user's manual
No abstract available.
Authors
Ronald R. Charpentier, Charles A. Sandberg
Late Devonian history of Michigan basin Late Devonian history of Michigan basin
The Upper Devonian sequence in the Michigan Basin is a westward extension of coeval cyclical facies of the Catskill deltaic complex in the Appalachian basin. Both basins and the intervening Findlay arch express the tectonic and sedimentational effects of foreland compression and isostatic compensation produced by the Acadian orogeny. The Late Devonian Michigan Basin formed as one of...
Authors
R.C. Gutschick, Charles Sandberg
Upper Devonian biostratigraphy of Michigan Basin Upper Devonian biostratigraphy of Michigan Basin
The Late Devonian Michigan Basin was floored by the Middle and Upper Devonian Squaw Bay Limestone, which was deposited during the downwarping that produced the basin within a former Middle Devonian carbonate platform. The Squaw Bay comprises three beds, each having a different conodont fauna. The two upper beds, deposited during the transitans Zone, have different conodont biofacies that...
Authors
R.C. Gutschick, Charles Sandberg
Comment and reply on "Delle Phosphatic Member: An anomalous phosphatic interval in the Mississippian (Osagean-Meramecian) shelf sequence of central Utah" Comment and reply on "Delle Phosphatic Member: An anomalous phosphatic interval in the Mississippian (Osagean-Meramecian) shelf sequence of central Utah"
No abstract available.
Authors
Charles Sandberg, R.C. Gutschick, Morris S. Petersen, Forrest G. Poole, Willi Ziegler
Science and Products
Filter Total Items: 43
Late Devonian sea-level changes, catastrophic events, and mass extinctions Late Devonian sea-level changes, catastrophic events, and mass extinctions
Late Devonian history is explained through event stratigraphy comprising a sequence of 18 sea-level changes, catastrophic events, and mass extinctions. Generally rising sea level during the initial Frasnian Stage, beginning with the Taghanic onlap and ending with a sea-level fall and major mass extinction, was interrupted by several exceptionally rapid, very high rises of sea level...
Authors
Charles Sandberg, Jared R. Morrow, W. Ziegler
Utility of palmatolepids and icriodontids in recognizing Upper Devonian Series, Stage, and possible substage boundaries Utility of palmatolepids and icriodontids in recognizing Upper Devonian Series, Stage, and possible substage boundaries
Conodonts are accepted internationally to define Devonian Series and Stage boundaries. Hence, the evolution and taxonomy of pelagic palmatolepids, primarily Palmatolepis and its direct ancestor Mesotaxis, and shallow-water icriodontids, Icriodus, Pelekysgnathus, and "Icriodus", are the major tools for recognizing subdivisions of the Upper Devonian. Palmatolepids are the basis for the...
Authors
W. Ziegler, Charles Sandberg
A late Frasnian (Late Devonian) radiolarian, sponge spicule, and conodont fauna from the Slaven Chert, northern Shoshone Range, Roberts Mountains allochthon, Nevada A late Frasnian (Late Devonian) radiolarian, sponge spicule, and conodont fauna from the Slaven Chert, northern Shoshone Range, Roberts Mountains allochthon, Nevada
Co-occuring conodonts, radiolarians, and sponge spicules from the type locality of the Slaven Chert, northern Shoshone Range, Nevada, indicate that the radiolarian and sponge spicule assemblage described herein correlates with the Late rhenana conodont Zone (late Frasnian). The moderately well preserved radiolarians are the first Frasnian-age fauna described from the Western Hemisphere...
Authors
S. Q. Boundy-Sanders, Charles Sandberg, B.L. Murchey, A. G. Harris
Alamo megabreccia: Record of a late devonian impact in southern Nevada Alamo megabreccia: Record of a late devonian impact in southern Nevada
The Alamo breccia is probably the most voluminous known outcropping carbonate megabreccia. It occupies ~4000 km2 across 11 mountain ranges in southern Nevada, has an average thickness of ~70 m, and contains a volume of 250+ km3. The breccia is a single bed, of early Frasnian (early Late Devonian) age, that formed in the wake of a giant slide that deposited a lower chaotic debrite...
Authors
John E. Warme, Charles Sandberg
Mississippian stratigraphic framework of east-central California and southern Nevada with revision of Upper Devonian and Mississippian stratigraphic units in Inyo County, California Mississippian stratigraphic framework of east-central California and southern Nevada with revision of Upper Devonian and Mississippian stratigraphic units in Inyo County, California
No abstract available.
Authors
Calvin H. Stevens, Darrell S. Klingman, Charles A. Sandberg, Paul Stone, Paul Belasky, Forrest G. Poole, J. Kent Snow
Devonian conodont biochronology in geologic time calibration Devonian conodont biochronology in geologic time calibration
The conodont-based biochronology of the Devonian Period is calibrated herein on the basis of: (1) a recent, reliable radiometric dating (CLAQUE??-LONG et al. 1992) of a stratigraphic position just above the Devonian-Carboniferous boundary; and (2) new calculations of stage durations based on our estimates and those of a large number of other Devonian workers, which pertain to many...
Authors
Charles Sandberg, W. Ziegler
Reflexions on Frasnian and Famennian stage boundary decisions as a guide to future deliberations Reflexions on Frasnian and Famennian stage boundary decisions as a guide to future deliberations
The pros and cons of the three conodont-based boundaries of the Frasnian and Famennian Stages and their corresponding GSSPs (Global Stratotype Section and Point) are evaluated in terms of current taxonomic, biostratigraphic, and sedimentologic knowledge. Two of these boundaries are based on easily identified pelagic species, which provide excellent bases for global correlation. The third...
Authors
W. Ziegler, Charles Sandberg
A Devonian/Carboniferous conodont database documentation and user's manual A Devonian/Carboniferous conodont database documentation and user's manual
No abstract available.
Authors
Ronald R. Charpentier, Charles A. Sandberg
A Devonian/Carboniferous conodont database documentation and user's manual A Devonian/Carboniferous conodont database documentation and user's manual
No abstract available.
Authors
Ronald R. Charpentier, Charles A. Sandberg
Late Devonian history of Michigan basin Late Devonian history of Michigan basin
The Upper Devonian sequence in the Michigan Basin is a westward extension of coeval cyclical facies of the Catskill deltaic complex in the Appalachian basin. Both basins and the intervening Findlay arch express the tectonic and sedimentational effects of foreland compression and isostatic compensation produced by the Acadian orogeny. The Late Devonian Michigan Basin formed as one of...
Authors
R.C. Gutschick, Charles Sandberg
Upper Devonian biostratigraphy of Michigan Basin Upper Devonian biostratigraphy of Michigan Basin
The Late Devonian Michigan Basin was floored by the Middle and Upper Devonian Squaw Bay Limestone, which was deposited during the downwarping that produced the basin within a former Middle Devonian carbonate platform. The Squaw Bay comprises three beds, each having a different conodont fauna. The two upper beds, deposited during the transitans Zone, have different conodont biofacies that...
Authors
R.C. Gutschick, Charles Sandberg
Comment and reply on "Delle Phosphatic Member: An anomalous phosphatic interval in the Mississippian (Osagean-Meramecian) shelf sequence of central Utah" Comment and reply on "Delle Phosphatic Member: An anomalous phosphatic interval in the Mississippian (Osagean-Meramecian) shelf sequence of central Utah"
No abstract available.
Authors
Charles Sandberg, R.C. Gutschick, Morris S. Petersen, Forrest G. Poole, Willi Ziegler