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Volume 85, Number 4

April, 1974

ISSN 0016-7606

EISSN 1943-2674

Evolution of the Axial Rifting Zone in Northern Iceland and the Tjörnes Fracture Zone

KRISTJÁN SÆMUNDSSON

Abstract

View articletitled, Evolution of the Axial Rifting Zone in Northern Iceland and the Tjörnes Fracture Zone

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GSA Bulletin April 01, 1974, Vol.85, 495-504. doi:https://doi.org/10.1130/0016-7606(1974)85<495:EOTARZ>2.0.CO;2

Emplacement Mechanism of the Miraleste Tuff Bed, Palos Verdes Hills, California

DAVID SCHLEICHER

Abstract

View articletitled, Emplacement Mechanism of the Miraleste Tuff Bed, Palos Verdes Hills, California

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GSA Bulletin April 01, 1974, Vol.85, 505-512. doi:https://doi.org/10.1130/0016-7606(1974)85<505:EMOTMT>2.0.CO;2

Topography and Structure of the Western Puerto Rico Trench

TERRY S. MALEY; FREDERICK D. SIEBER; G. LEONARD JOHNSON

Abstract

View articletitled, Topography and Structure of the Western Puerto Rico Trench

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GSA Bulletin April 01, 1974, Vol.85, 513-518. doi:https://doi.org/10.1130/0016-7606(1974)85<513:TASOTW>2.0.CO;2

Variance of Terrestrial Heat Flow between the North American Craton and the Canadian Shield

PAUL B. SLACK

Abstract

View articletitled, Variance of Terrestrial Heat Flow between the North American Craton and the Canadian Shield

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GSA Bulletin April 01, 1974, Vol.85, 519-522. doi:https://doi.org/10.1130/0016-7606(1974)85<519:VOTHFB>2.0.CO;2

Geology and Petrology of the Cambria Felsite, a New Oligocene Formation, West-Central California Coast Ranges

W. G. ERNST; C. A. HALL, JR.

Abstract

View articletitled, Geology and Petrology of the Cambria Felsite, a New Oligocene Formation, West-Central California Coast Ranges

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GSA Bulletin April 01, 1974, Vol.85, 523-532. doi:https://doi.org/10.1130/0016-7606(1974)85<523:GAPOTC>2.0.CO;2

Detachment Tectonics in Western Papua New Guinea

DAVID A. L. JENKINS

Abstract

View articletitled, Detachment Tectonics in Western Papua New Guinea

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GSA Bulletin April 01, 1974, Vol.85, 533-548. doi:https://doi.org/10.1130/0016-7606(1974)85<533:DTIWPN>2.0.CO;2

Tectonic Significance of Intrusive Rocks in the Maya Mountains, British Honduras

STEPHEN E. KESLER; CLIVE F. KIENLE; J. HOWARD BATESON

Abstract

View articletitled, Tectonic Significance of Intrusive Rocks in the Maya Mountains, British Honduras

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GSA Bulletin April 01, 1974, Vol.85, 549-552. doi:https://doi.org/10.1130/0016-7606(1974)85<549:TSOIRI>2.0.CO;2

Geology of Coral Terraces, Huon Peninsula, New Guinea: A Study of Quaternary Tectonic Movements and Sea-Level Changes

JOHN CHAPPELL

Abstract

View articletitled, Geology of Coral Terraces, Huon Peninsula, New Guinea: A Study of Quaternary Tectonic Movements and Sea-Level Changes

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GSA Bulletin April 01, 1974, Vol.85, 553-570. doi:https://doi.org/10.1130/0016-7606(1974)85<553:GOCTHP>2.0.CO;2

Nature of the Angular Unconformity between the Paleozoic Metasedimentary Rocks and the Mesozoic Metavolcanic Rocks in the Eastern Sierra Nevada, California

CHARLES A. BROOK; WARREN J. NOKLEBERG; RONALD W. KISTLER

Abstract

View articletitled, Nature of the Angular Unconformity between the Paleozoic Metasedimentary Rocks and the Mesozoic Metavolcanic Rocks in the Eastern Sierra Nevada, California

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GSA Bulletin April 01, 1974, Vol.85, 571-576. doi:https://doi.org/10.1130/0016-7606(1974)85<571:NOTAUB>2.0.CO;2

D/H and ¹⁸O/¹⁶O Ratios in Waters Contained in Geodes from the Basaltic Province of Rio Grande do Sul, Brazil

EIICHI MATSUI; ENEAS SALATI; O. J. MARINI

Abstract

View articletitled, D/H and <sup>18</sup>O/<sup>16</sup>O Ratios in Waters Contained in Geodes from the Basaltic Province of Rio Grande do Sul, Brazil

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GSA Bulletin April 01, 1974, Vol.85, 577-580. doi:https://doi.org/10.1130/0016-7606(1974)85<577:DAORIW>2.0.CO;2

Evolution of Meander Loops

JAMES C. BRICE

Abstract

View articletitled, Evolution of Meander Loops

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GSA Bulletin April 01, 1974, Vol.85, 581-586. doi:https://doi.org/10.1130/0016-7606(1974)85<581:EOML>2.0.CO;2

Stratigraphy and Palynology of Late Quaternary Sediments in the Puget Lowland, Washington

BARBARA SPROSS HANSEN; DON J. EASTERBROOK

Abstract

View articletitled, Stratigraphy and Palynology of Late Quaternary Sediments in the Puget Lowland, Washington

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GSA Bulletin April 01, 1974, Vol.85, 587-602. doi:https://doi.org/10.1130/0016-7606(1974)85<587:SAPOLQ>2.0.CO;2

Age and Evolution of the Upper Cenozoic Andesitic Volcanism in Central-South Chile

MARIO VERGARA; FRANCISCO MUNIZAGA

Abstract

View articletitled, Age and Evolution of the Upper Cenozoic Andesitic Volcanism in Central-South Chile

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GSA Bulletin April 01, 1974, Vol.85, 603-606. doi:https://doi.org/10.1130/0016-7606(1974)85<603:AAEOTU>2.0.CO;2

Tectonic Evolution of the Southern Gulf of Mexico

GEORGE W. MOORE; LUIS DEL CASTILLO

Abstract

View articletitled, Tectonic Evolution of the Southern Gulf of Mexico

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GSA Bulletin April 01, 1974, Vol.85, 607-618. doi:https://doi.org/10.1130/0016-7606(1974)85<607:TEOTSG>2.0.CO;2

Geophysical Study of the Easternmost Walvis Ridge, South Atlantic: Morphology and Shallow Structure

J. GOSLIN; J. MASCLE; J. C. SIBUET; H. HOSKINS

Abstract

View articletitled, Geophysical Study of the Easternmost Walvis Ridge, South Atlantic: Morphology and Shallow Structure

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GSA Bulletin April 01, 1974, Vol.85, 619-632. doi:https://doi.org/10.1130/0016-7606(1974)85<619:GSOTEW>2.0.CO;2

Formation of Red Beds in Moist Tropical Climates: A Hypothesis

THEODORE R. WALKER

Abstract

View articletitled, Formation of Red Beds in Moist Tropical Climates: A Hypothesis

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GSA Bulletin April 01, 1974, Vol.85, 633-638. doi:https://doi.org/10.1130/0016-7606(1974)85<633:FORBIM>2.0.CO;2

K-Ar and Rb-Sr Data on Detrital and Postdepositional History of Pennsylvanian Clay from Ohio and Pennsylvania

A. W. HOFMANN; J. W. MAHONEY, JR.; B. J. GILETTI

Abstract

View articletitled, K-Ar and Rb-Sr Data on Detrital and Postdepositional History of Pennsylvanian Clay from Ohio and Pennsylvania

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GSA Bulletin April 01, 1974, Vol.85, 639-644. doi:https://doi.org/10.1130/0016-7606(1974)85<639:KARDOD>2.0.CO;2

Oceanic Crust Forms Basement of Eastern Panamá

J. E. CASE

Abstract

View articletitled, Oceanic Crust Forms Basement of Eastern Panamá

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GSA Bulletin April 01, 1974, Vol.85, 645-652. doi:https://doi.org/10.1130/0016-7606(1974)85<645:OCFBOE>2.0.CO;2

Geology of Eastern Papua: Discussion

EMILE ROD

Abstract

View articletitled, Geology of Eastern Papua: Discussion

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GSA Bulletin April 01, 1974, Vol.85, 653-658. doi:https://doi.org/10.1130/0016-7606(1974)85<653:GOEPD>2.0.CO;2

Late Pleistocene Shorelines and Stratigraphic Relations in the Lake Michigan Basin: Discussion

ROBERT F. BLACK

Abstract

View articletitled, Late Pleistocene Shorelines and Stratigraphic Relations in the Lake Michigan Basin: Discussion

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GSA Bulletin April 01, 1974, Vol.85, 659-660. doi:https://doi.org/10.1130/0016-7606(1974)85<659:LPSASR>2.0.CO;2

Late Pleistocene Shorelines and Stratigraphic Relations in the Lake Michigan Basin: Reply

EDWARD B. EVENSON; WILLIAM R. FARRAND; DONALD F. ESCHMAN

Abstract

View articletitled, Late Pleistocene Shorelines and Stratigraphic Relations in the Lake Michigan Basin: Reply

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GSA Bulletin April 01, 1974, Vol.85, 661-664. doi:https://doi.org/10.1130/0016-7606(1974)85<661:LPSASR>2.0.CO;2

Evolutionary Patterns in the Paleozoic Bivalvia: Documentation and Some Theoretical Considerations: Discussion

DAVID M. ROHR; A. J. BOUCOT

Abstract

View articletitled, Evolutionary Patterns in the Paleozoic Bivalvia: Documentation and Some Theoretical Considerations: Discussion

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GSA Bulletin April 01, 1974, Vol.85, 665-666. doi:https://doi.org/10.1130/0016-7606(1974)85<665:EPITPB>2.0.CO;2

Evolutionary Patterns in the Paleozoic Bivalvia: Documentation and Some Theoretical Considerations: Reply

PETER W. BRETSKY

Abstract

View articletitled, Evolutionary Patterns in the Paleozoic Bivalvia: Documentation and Some Theoretical Considerations: Reply

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GSA Bulletin April 01, 1974, Vol.85, 667-668. doi:https://doi.org/10.1130/0016-7606(1974)85<667:EPITPB>2.0.CO;2

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Late orogenic high-temperature overprint in (ultra)high-pressure ([U]HP) metamorphic rocks of the North Qinling Orogen, Central China: Insights into the geodynamics of the exhumation of (U)HP metamorphic rocks

New paleomagnetic and geochronologic results from late Paleozoic rocks in the Turfan-Hami block (NW China) and implications for the geodynamic evolution of the western Altaids

Resolving complex stratigraphic architecture across the Burlington shelf and identifying the Devonian-Carboniferous (Hangenberg) and Kinderhookian-Osagean (Tournaisian) boundary biogeochemical events in the type area of the Mississippian subsystem

Tracing the crustal evolution of the Precambrian Southern Granulite terrane in East Gondwana: New insights from zircon U-Pb/Hf geochronology

Influence of multistage hydrothermal fluids on dolomite reservoirs: A case study from the Lower Ordovician Yeli-Liangjiashan Formation in the Chengdao-Zhuanghai area, Jiyang subbasin, Bohai Bay Basin, China

Evolution of the Axial Rifting Zone in Northern Iceland and the Tjörnes Fracture Zone

Emplacement Mechanism of the Miraleste Tuff Bed, Palos Verdes Hills, California

Topography and Structure of the Western Puerto Rico Trench

Variance of Terrestrial Heat Flow between the North American Craton and the Canadian Shield

Geology and Petrology of the Cambria Felsite, a New Oligocene Formation, West-Central California Coast Ranges

Detachment Tectonics in Western Papua New Guinea

Tectonic Significance of Intrusive Rocks in the Maya Mountains, British Honduras

Geology of Coral Terraces, Huon Peninsula, New Guinea: A Study of Quaternary Tectonic Movements and Sea-Level Changes

Nature of the Angular Unconformity between the Paleozoic Metasedimentary Rocks and the Mesozoic Metavolcanic Rocks in the Eastern Sierra Nevada, California

D/H and ¹⁸O/¹⁶O Ratios in Waters Contained in Geodes from the Basaltic Province of Rio Grande do Sul, Brazil

Evolution of Meander Loops

Stratigraphy and Palynology of Late Quaternary Sediments in the Puget Lowland, Washington

Age and Evolution of the Upper Cenozoic Andesitic Volcanism in Central-South Chile

Tectonic Evolution of the Southern Gulf of Mexico

Geophysical Study of the Easternmost Walvis Ridge, South Atlantic: Morphology and Shallow Structure

Formation of Red Beds in Moist Tropical Climates: A Hypothesis

K-Ar and Rb-Sr Data on Detrital and Postdepositional History of Pennsylvanian Clay from Ohio and Pennsylvania

Oceanic Crust Forms Basement of Eastern Panamá

Geology of Eastern Papua: Discussion

Late Pleistocene Shorelines and Stratigraphic Relations in the Lake Michigan Basin: Discussion

Late Pleistocene Shorelines and Stratigraphic Relations in the Lake Michigan Basin: Reply

Evolutionary Patterns in the Paleozoic Bivalvia: Documentation and Some Theoretical Considerations: Discussion

Evolutionary Patterns in the Paleozoic Bivalvia: Documentation and Some Theoretical Considerations: Reply

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