Skip to main content
    • Aa
    • Aa

Three new species of the Hettangian (Early Jurassic) ammonite Sunrisites from British Columbia, Canada

  • L. M. Longridge (a1), P. L. Smith (a1), J. Pálfy (a2) and H. W. Tipper (a3)

Most species of the middle and late Hettangian psiloceratid genus Sunrisites are endemic to the eastern Pacific, where they are common members of ammonoid assemblages. the Taseko Lakes map area in British Columbia yields diverse and well-preserved Sunrisites faunas which are formally described here for the first time. Three new species are recognized, S. brimblecombei, S. chilcotinensis, and S. senililevis. the new species require an extension of the morphological range of the genus to include forms that become moderately involute at large shell diameters. Signs of sexual dimorphism are apparent within all three new species of Sunrisites. This work extends the stratigraphic range of Sunrisites to include the latest Hettangian Rursicostatum Zone in North America. The distribution of Sunrisites suggests that the Hispanic Corridor, which linked the western Tethyan Ocean and the eastern Pacific, may have been open during the Hettangian. Furthermore, occurrences of the genus constrain the Hettangian position of several allochthonous terranes to the northeastern Pacific.

Linked references
Hide All

This list contains references from the content that can be linked to their source. For a full set of references and notes please see the PDF or HTML where available.

M. Aberhan 1999. Terrane history of the Canadian Cordillera: Estimating amounts of latitudinal displacement and rotation of Wrangellia and Stikinia. Geological Magazine, 136:481492.

M. Aberhan 2001. Bivalve palaeobiogeography and the Hispanic Corridor: Time of opening and effectiveness of a proto-Atlantic seaway. Palaeogeography, Palaeoclimatology, Palaeoecology, 165:375394.

P. Belasky , C. H. Stevens , and R. A. Hanger 2002. Early Permian location of western North American terranes based on brachiopod, fusulinid, and coral biogeography. Palaeogeography, Palaeoclimatology, Palaeoecology, 179:245266.

P. J. Coney , D. L. Jones , and W. H. Monger 1980. Cordilleran suspect terranes. Nature, 288:329333.

S. E. Damborenea and M. O. Manceñido 1979. On the palaeogeographical distribution of the pectinid genus Weyla (Bivalvia, Lower Jurassic). Palaeogeography, Palaeoclimatology, Palaeoecology, 27:85102.

R. A. Davis , N. H. Landman , J.-L. Dommergues , D. Marchand , and H. Bucher 1996. Mature modifications and dimorphism in ammonoids cephalopods, p. 463539. In N. H. Landman , K. Tanabe , and R. A. Davis (eds.), Ammonoid Paleobiology. Topics in Geobiology, 13. Plenum Press, New York.

C. M. González-León , D. G. Taylor , and G. D. Stanley Jr. 1996. The Antimonio Formation in Sonora, Mexico, and the Triassic-Jurassic boundary. Canadian Journal of Earth Sciences, 33:418426.

C. M. González-León , G. D. Stanley Jr., and D. G. Taylor 2000. Ammonoid discoveries in the Antimonio Formation, Sonora, Mexico: New constraints on the Triassic-Jurassic boundary. Journal of South American Earth Sciences, 13:491497.

A. von Hillebrandt . 1981b. Kontinentalverschiebung und die paläozoogeographischen Beziehungen des südamerikanischen Lias. Sonderdruck aus der Geologischen Rundschau, 70:570582.

G. K. Jakobs , P. L. Smith , and H. W. Tipper 1994. An ammonite zonation for the Toarcian (Lower Jurassic) of the North American Cordillera. Canadian Journal of Earth Sciences, 31:919942.

L. M. Longridge , P. L. Smith , and H. W. Tipper 2006. The Early Jurassic ammonite Badouxia from British Columbia, Canada. Palaeontology, 49: 795816.

S. Moyne , P. Neige , D. Marchand , and J. Thierry 2004. Répartition mondiale des faunes d'ammonites au Jurassique moyen (Aalénien supérieur à Bathonien moyen): relations entre biodiversité et paléogéographie. Bulletin de la Société Géologique de France, 175(5):513523.

C. R. Newton 1988. Significance of “Tethyan” fossils in the American Cordillera. Science, 242:385391.

J. Pálfy , P. L. Smith , J. K. Mortensen , and R. M. Friedman 1999. Integrated ammonite biochronology and U-Pb geochronometry from a basal Jurassic section in Alaska. Geological Society of America Bulletin, 111: 15371549.

A. Riccardi , S. E. Damborenea , M. O. Manceñido , and S. C. Ballent 1991. Hettangian and Sinemurian (Lower Jurassic) biostratigraphy of Argentina. Journal of South American Earth Sciences, 4:159170.

J. Sha 2001. Hispanic corridor formed as early as Hettangian: On the basis of bivalve fossils. Chinese Science Bulletin, 47:414417.

P. L. Smith 1983. The Pliensbachian ammonite Dayiceras dayiceroides and Early Jurassic paleogeography. Canadian Journal of Earth Sciences, 20:8691.

P. L. Smith and H. W. Tipper 1986. Plate tectonics and paleobiogeography: Early Jurassic (Pliensbachian) endemism and diversity. Palaios, 1:399412.

P. L. Smith and G. Westermann 1990. Paleobiogeography of the ancient Pacific. Science, 249:680.

P. L. Smith , H. W. Tipper , and D. M. Ham 2001. Lower Jurassic Amaltheidae (Ammonitina) in North America: Paleobiogeography and tectonic implications. Canadian Journal of Earth Sciences, 38:14391449.

P. L. Smith , H. W. Tipper , D. G. Taylor , and J. Guex 1988. An ammonite zonation for the Lower Jurassic of Canada and the United States: The Pliensbachian. Canadian Journal of Earth Sciences, 25:15031523.

L. F. Spath 1923. On ammonites from New Zealand [Appendix to: C. T. Trechmann. The Jurassic rocks of New Zealand]. Quarterly Journal of the Geological Society of London, 79:286308.

D. G. Taylor 1998. Late Hettangian-Early Sinemurian (Jurassic) ammonite biochronology of the western Cordillera, United States. Geobios, 31:467497.

J. Wang , C. R. Newton , and L. Dunne 1988. Late Triassic transition from biogenic to arc sedimentation on the Peninsular terrane: Puale Bay, Alaska Peninsula. Geological Society of America Bulletin, 100:14661478.

Recommend this journal

Email your librarian or administrator to recommend adding this journal to your organisation's collection.

Journal of Paleontology
  • ISSN: 0022-3360
  • EISSN: 1937-2337
  • URL: /core/journals/journal-of-paleontology
Please enter your name
Please enter a valid email address
Who would you like to send this to? *


Abstract views

Total abstract views: 101 *
Loading metrics...

* Views captured on Cambridge Core between September 2016 - 22nd September 2017. This data will be updated every 24 hours.