Contributions to the palaeontology and stratigraphy of the Jurassic System in Canada

Frebold, Hans

doi:10.4095/101519

Cited by 9 publications

(15 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…6 ) Published Occurrences Manning Park and Taseko Lakes (McLearn in Leech 1953;Frebold 1967c, Frebold et al 1969 ; Mount Waddington (Frebold in Tipper 1969) ; Whitesail Lake (Frebold 195 1 ;Frebold in Duffel1 1959).…”

Section: Middle Jurassicmentioning

confidence: 95%

“…Whitehorse (Buckman in Cockfield and Bell 1926;Frebold in Wheeler 196 1 ;Frebold 1964a) ; Fernie Group, Rocky Mountains (Warren 193 1, 1934;Collet 1931;Frebold 1953Frebold ,1957Frebold ,1962bFrebold , 1969.…”

Section: Dence Of Lower Pliensbachian In Mcconnellmentioning

confidence: 99%

“…The problems of nomenclature are somewhat confused and many collections come from unnamed units. Rock units, stratigraphy, and nomenclature have been discussed previously (Frebold 1953;Springer et al 1965) and can be revised more suitably when more stratigraphic details become available. As a result references to groups, formations, and members have largely been deleted in this report.…”

Section: Introductionmentioning

confidence: 99%

“…7, 1970 Taseko Lakes (Crickmay in Cairnes 1943;Frebold 195 1 ) ; Vancouver Island (Crickmay 1928(Crickmay , 193 1, 1962 ; Queen Charlotte Islands (Whiteaves 1887(Whiteaves , 1889a, the beds concerned were erroneously considered to be Triassic; Frebold in Sutherland Brown 1968); Aiken Lake (McLearn in Roots 1954); Tulsequah (Frebold 1964a) ; Atlin (Frebold in Aitken 1959). Whitehorse (McLearn in Wheeler 1961 ) ; Laberge (Lees 1934;Frebold 1964aFrebold , 1964b; Fernie Group, Rocky Mountains (Warren 1931(Warren , 1934Frebold 1953Frebold , 1954Frebold , 1957Frebold , 1962aFrebold , 1964aFrebold , 1969 Status of the Lower Sinemurian The new localities indicate a much wider distribution of lower Sinemurian beds than previously known. Of special interest is its occurrence in the Smithers area, where beds of this age are found in the lower volcanic division of the Hazelton Group.…”

mentioning

confidence: 99%

See 3 more Smart Citations

Status of the Jurassic in the Canadian Cordillera of British Columbia, Alberta, and southern Yukon

Frebold¹,

Tipper²

1970

Can. J. Earth Sci.

View full text Add to dashboard Cite

Jurassic index fossils of the Canadian Cordillera indicate the presence of some zones of most Jurassic stages. In this report the more important localities are listed, the source of information, published and unpublished, is indicated, and an up-dated correlation chart is presented. The importance of tectonic events and their effect on the completeness of the Jurassic fossil record and on the Jurassic paleogeography are stressed.

show abstract

Section: Middle Jurassicmentioning

confidence: 95%

Section: Dence Of Lower Pliensbachian In Mcconnellmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

Status of the Jurassic in the Canadian Cordillera of British Columbia, Alberta, and southern Yukon

Frebold¹,

Tipper²

1970

Can. J. Earth Sci.

View full text Add to dashboard Cite

show abstract

“…Sometimes this general asymmetry (siphuncle offset and accompanying septal asymmetry) is characteristic of virtually all members of a species whereas in other cases it is only displayed in some individuals. The asymmetry is prevalent in many Hettangian genera including Neophyllites, Psiloceras, Euphyllites, Eolytoceras, Caloceras, Alsatites, Sunrisites, Badouxia, Kammerkarites, Franziceras, Discamphiceras, Paradiscamphiceras, Kammerkaroceras, Curviceras and Storthoceras (Bilotta 2010;Bloos 1981Bloos , 1994Bloos , 1996Bloos , 1999Bloos and Page 2000;Böhm et al 1999;Canavari 1882;Frebold 1951Frebold , 1967Guérin-Franiatte 1990;Guex 1989Guex , 1995Guex and Rakús 1991;Hengsbach 1986a, b;Hillebrandt 2000a-c;Hillebrandt and Krystyn 2009;Lange 1941Lange , 1952Longridge et al 2006Longridge et al , 2008aNeumayr 1879;Rakús 1993b;Schlegelmilch 1976;Spath 1919Spath , 1924Taylor 1988;Wähner 1882Wähner -1898Wiedmann 1970;Yin et al 2007). Asymmetry is also recognized in some younger Early Jurassic genera such as Arctoasteroceras, Aequilobus and Dudresnayiceras in the Sinemurian, and Sinuiceras in the Pliensbachian (Bilotta 2010;Frebold 1960).…”

Section: Siphuncle Offset and Septal Face Asymmetrymentioning

confidence: 99%

Ammonoids at the Triassic-Jurassic Transition: Pulling Back from the Edge of Extinction

Longridge

Smith

2015

Topics in Geobiology

View full text Add to dashboard Cite

The mass extinction at the end of the Triassic is one of the "big five" extinctions in the Phanerozoic and one of four that directly affected the evolutionary history of the ammonoids. At the Triassic-Jurassic (T-J) transition, approximately 22 % of marine families, 53 % of genera and 80 % of species became extinct (Pálfy 2003;Sepkoski 1996) but the event is of particular significance to the ammonoids because of their near demise. Left hanging by a thread, the group managed to pull back from the brink of extinction and, in spectacular fashion, re-establish itself as a dominant presence throughout the rest of the Mesozoic. As a result of the exceptionally low eustatic sea-level at the time, a situation that almost certainly contributed to the dynamics and severity of the extinction, there are only a very small number of marine stratigraphic sections that are reasonably continuous across the T-J boundary. The list includes an exposure in Austria that was recently designated Global Stratotype Section and Point for the base of the Jurassic (Hillebrandt et al. 2013). Studying the precise details of the T-J event horizon is therefore difficult, but a clear picture of the scale of the ammonoid near extinction and a sense of the dynamics of recovery can be obtained by considering high level taxonomic changes, broad patterns of generic diversity and differences in morphospace occupation across the entire Late Triassic to Middle Jurassic interval. This is the purpose of our brief review.Interpreted environmental changes over the T-J interval include initial cooling, longer term global warming, widespread aridification, a global regression/transgression couplet, oceanic anoxia and a biocalcification crisis brought on by lower seawater pH

show abstract

The bajocian ammonites of Western Australia

1954

Phil. Trans. R. Soc. Lond. B

View full text Add to dashboard Cite

The Bajocian (Middle Jurassic) ammonites of Western Australia are described on the basis of an extensive collection made in 1952-3 by Phillip E. Playford, who contributes a stratigraphical introduction and a geological map. In this introduction he subdivides the Jurassic sediments (total thickness at outcrop up to 550 ft.), names and defines most of the groups and formations for the first time, and elucidates complications due to lateritic alteration. All the ammonites come from the Newmarracarra Limestone (up to 38 ft. thick). The ranges of the species are determined so far as practicable. The ammonite fauna comprises at least twenty-three species (at least eleven new), now assigned to seven genera. The new collection enables Crick’s type specimens, named in 1894 on the basis of defective and inadequate material, to be reinterpreted, and necessitates complete generic revision. The age of the fauna is Middle Bajocian. Most of it belongs to the Sowerbyi Zone, but in places there is believed to be also a thin representative of the Humphriesianum Zone. A comparison (now possible for the first time) is made with the Bajocian ammonite faunas of circum-Pacific countries and central Asia: New Guinea, the Moluccas, Tibet, eastern Siberia, Alaska, western Canada, western United States, Mexico and the Andes. Photographs are given of comparable ammonites from Tibet, Canada and Argentina, not previously published photographically. Apart from the Moluccas, the peculiar Australian stephanoceratid ammonites, Pseudotoites and their allies, are not known from any of the extensive Bajocian outcrops in the Old World. Hitherto they have been thought to be confined to Western Australia. It is now shown that Pseudotoites occurs in the Moluccas, British Columbia, Alaska and Argentina, and that some rarer allied forms of Western Australia belong to the genus Zemistephanus , hitherto known only in Canada, Alaska and the United States. This distribution is held to indicate free migration across the Pacific Ocean. The regional basis of evolutionary radiation in several groups of Middle Bajocian ammonites is pointed out, and the significance of the facts for evolutionary and systematic theory is briefly stated. The Middle Bajocian stratigraphy of north-west Europe is historically summarized in order to provide a framework and scale of comparison for the Australian and circum-Pacific deposits.

show abstract

Contributions to the palaeontology and stratigraphy of the Jurassic System in Canada

Cited by 9 publications

References 0 publications

Status of the Jurassic in the Canadian Cordillera of British Columbia, Alberta, and southern Yukon

Status of the Jurassic in the Canadian Cordillera of British Columbia, Alberta, and southern Yukon

Ammonoids at the Triassic-Jurassic Transition: Pulling Back from the Edge of Extinction

The bajocian ammonites of Western Australia

Contact Info

Product

Resources

About