The University of British Columbia

RESEARCH INTERESTS: My Ph.D. research involved the study of the systematics and paleobiology of Hettangian ammonites from British Columbia. The Hettangian is the first stage in the Jurassic, and thus, follows the end-Triassic mass extinction. Only one group of ammonites survived this extinction, forming the basis for the spectacular adaptive radiation of the group in the earliest Jurassic. The taxonomy from my study establishes a better understanding of the forms present in B.C. over this interval. The lateral distribution of ammonite faunas suggest there may have been some longitudinal separation between the craton and the Cadwallader, Wrangellia and Peninsular terranes during the Hettangian. They also support a significant northward displacement for Wrangellia relative to the craton since Early Jurassic time and suggest that the Hispanic Corridor connecting the Panthalassa and Tethys oceans may have been open during the Hettangian. Sexual dimorphism is present in several Hettangian ammonite genera. Furthermore, many Hettangian ammonites show considerable asymmetries in the vertical position of the internal elements of their phragmocone. We used computer models to assess the hydrostatic affects of these asymmetries on the ammonite, Badouxia columbiae.

My current postdoctoral research involves examining patterns of ammonite morphology in the Late Triassic and Early Jurassic.

REFEREED PUBLICATIONS:

• Longridge, L.M., Smith, P.L., Rawlings, G.W. and Klaptocz, V.R. The impact of asymmetries in the elements of the phragmocone of Early Jurassic ammonites. Palaeontologica Electronica.
• Longridge, L.M., Pálfy, J., Smith, P.L. and Tipper, H.W. 2008. Middle and late Hettangian ammonites from the Queen Charlotte Islands, British Columbia, Canada. Revue de Paleobiologie 27, 191-248.
• Longridge, L.M., Smith, P.L. and Tipper, H.W. 2008. Late Hettangian (Early Jurassic) ammonites from British Columbia, Canada. Palaeontology 51, 367-404.
• Longridge, L.M., Smith, P.L., Pálfy, J. and Tipper, H.W. 2008. Three new species of the Hettangian (Early Jurassic) ammonite Sunrisites from British Columbia, Canada. Journal of Paleontology 38, 128-139.
• Longridge, L.M., Carter, E.S., Smith, P.L. and Tipper, H.W. 2007. Early Hettangian (Early Jurassic) ammonites and radiolarians from the Queen Charlotte Islands, British Columbia and their bearing on the definition of the Triassic-Jurassic boundary. Palaeogeography, Palaeoclimatology, Palaeoecology 244, 142-169.
• Longridge, L.M., Smith, P.L. and Tipper, H.W. 2006. The Early Jurassic ammonite Badouxia from British Columbia, Canada. Palaeontology 49, 795-816.

UNREFEREED PUBLICATIONS:

• Longridge, L.M., Carter, E.S., Haggart, J.W. and Smith, P.L. 2007. The Triassic-Jurassic transition at Kunga Island, Queen Charlotte Islands, British Columbia, Canada. International Subcommission on Jurassic Stratigraphy Newsletter 34, 21-33.
• Longridge, L.M. 2004. Sexual dimorphism in Early Jurassic ammonites from British Columbia. British Columbia Paleontological Alliance Newsletter 38, 10-12.

PRESENTATIONS:

• L.M. Longridge and P.L. Smith. Ammonite Phragmocone Asymmetries. 18th Canadian Paleontology Conference - September, 2008. (Winnipeg, Manitoba)
• P. Smith, L. Longridge, E. Carter, J. Haggart 'The Triassic-Jurassic transition, Queen Charlotte Islands, British Columbia'. The Fourth Symposium for International Geoscience Programme Project 506, Marine and Non-Marine Jurassic: Global Correlation and Major Geological Events - July 2007. (Bristol, England)
• L.M. Longridge 'Hettangian fossils from British Columbia'. Talk presented at the Seventh British Columbia Paleontological Symposium - May 2007. (Courtenay, British Columbia)
• L.M. Longridge and P.L. Smith 'A counterweight mechanism in Hettangian ammonites?'. Talk presented at the Seventh International Congress on the Jurassic System - September 2006. (Krakow, Poland)
• L.M. Longridge, E.S. Carter, P.L. Smith, and H.W. Tipper 'Early Hettangian ammonites and radiolarians from the Queen Charlotte Islands (British Columbia, Canada) and their bearing on the definition of the Triassic-Jurassic boundary'. Poster presented at the Seventh International Congress on the Jurassic System - September 2006. (Krakow, Poland)
• L.M. Longridge, P.L. Smith, J. Palfy and H.W. Tipper ' Three new species of the Hettangian (Early Jurassic) ammonite Sunrisites from British Columbia, Canada. Talk presented at the Second International Palaeontological Congress - June 2006. (Beijing, China)
• L.M. Longridge, E.S. Carter, P.L. Smith, and H.W. Tipper 'Early Hettangian ammonites and radiolarians from the Queen Charlotte Islands (British Columbia, Canada) and their bearing on the definition of the Triassic-Jurassic boundary'. Poster presented at the Second International Palaeontological Congress - June 2006. (Beijing, China)
• L.M. Longridge, P.L. Smith, and H.W. Tipper ‘Suture asymmetry and sexual dimorphism in Hettangian (Early Jurassic) ammonites from British Columbia, Canada’. Poster presented at the North American Paleontological Convention – June 2005. (Halifax, Nova Scotia)
• L.M. Longridge ‘The Jurassic ammonite Badouxia in space and time’. Talk presented at the Western Inter-University Geosciences Conference – January 2004. (Vancouver, B.C.)
• L.M. Longridge ‘Biogeography, diversity and systematics of the Jurassic ammonite Badouxia’. Talk presented at the Fifth Young Systematists Forum – December 2003. (Kew, England)
• L.M. Longridge ‘The Jurassic ammonite Badouxia from the Taseko Lakes map area, British Columbia’. Talk presented at the Canadian Paleontology Conference – September 2003. (Edmonton, Alberta)
• L.M. Longridge, P.L. Smith, and H.W. Tipper ‘The Jurassic ammonite Badouxia in space and time’. Talk presented at the British Columbia Paleontological Symposium – May 2003. (Nanaimo, B.C.)

ACADEMIC TEACHING:

• Sessional Instructor - Earth and Life Through Time (Spring 2011 - present)
• Sessional Instructor - Dinosaurs' Earth (Spring 2009 - present)
• Sessional Lecturer - Geological Time (Spring 2008)
• Guest Lecturer - Advanced Paleontology (Fall 2007)
• Sessional Lecturer - Geological Time (Spring 2006)
• Sessional Lecturer - Earth and Life Through Time (Fall 2005)
• Teaching Assistant - Introductory Oceanography, Paleontology (2001-2003)

AWARDS and SCHOLARSHIPS:

• Palaeontological Association Travel Award - Beijing, China (2006)
• University Graduate Fellowship (2005-2006)
• Egil H. Lorntzsen Scholarship (2004-2005)
• National Science and Engineering Research Council Scholarship (2003-2005)
• CSPG John B. Webb Award – Western Inter-University Geosciences Conference Best Graduate Talk 2004
• Thomas and Marguerite MacKay Scholarship (2003-2004)
• Bolton Prize – Canadian Paleontology Conference Best Student Paper 2003
• Paleontological Research Institute Student Award – Runner-up 2003
• Thomas and Marguerite MacKay Scholarship (2002-2003)