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
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