selected scholarly activity
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academic article
- Jurassic ammonite aptychi: functions and evolutionary implications. Swiss Journal of Palaeontology. 135:101-108. 2016
- Ammonite aptychi: Functions and role in propulsion. Geobios. 47:45-55. 2014
- New evidence for the age of the Athol Formation (Middle Jurassic; Bajocian) in the Tusk-1 and Tusk-2 wells, offshore Carnarvon Basin, Western Australia. Alcheringa. 34:21-35. 2010
- Towards a guide to palaeobiogeographic classification. Palaeogeography, Palaeoclimatology, Palaeoecology. 201:179-181. 2003
- RECURRENCES OF HYPOTHESES ABOUT AMMONITES AND ARGONAUTA. Journal of Paleontology. 77:792-795. 2003
- New Jurassic Ammonitina from New Zealand: Bathonian‐Callovian Eurycephalitinae. New Zealand Journal of Geology, and Geophysics. 45:499-525. 2002
- Finite-element analysis of simulated ammonoid septa (extinct Cephalopoda): septal and sutural complexities do not reduce strength. Paleobiology. 28:113-126. 2002
- Were limpets or mosasaurs responsible for the perforations in the ammonite Placenticeras?. Palaeogeography, Palaeoclimatology, Palaeoecology. 169:245-270. 2001
- Modes of extinction, pseudo-extinction and distribution in Middle Jurassic ammonites: terminology. Canadian Journal of Earth Sciences. 38:187-195. 2001
- Marine faunal realms of the Mesozoic: review and revision under the new guidelines for biogeographic classification and nomenclature. Palaeogeography, Palaeoclimatology, Palaeoecology. 163:49-68. 2000
- Biochore classification and nomenclature in paleobiogeography: an attempt at order. Palaeogeography, Palaeoclimatology, Palaeoecology. 158:1-13. 2000
- Bajocian (middle Jurassic) Ammonitina of New Zealand. New Zealand Journal of Geology, and Geophysics. 43:33-57. 2000
- An early Bathonian Tethyan ammonite fauna from Argentina. Palaeontology. 42:193-209. 1999
- Buoyancy calculations and ecology of Callovian (Jurassic) cylindroteuthid belemnites. Neues Jahrbuch fur Geologie und Palaontologie - Abhandlungen Neues Jahrbuch f�r Geologie und Palaontologie - Monatshefte. 211:89-112. 1999
- A new Anaptychus-like jaw apparatus of Jurassic ?Lytoceras from Argentina. Neues Jahrbuch fur Geologie und Palaontologie - Abhandlungen Neues Jahrbuch f�r Geologie und Palaontologie - Monatshefte. 21-28. 1999
- Ammonoid habitats and habits in the Western Interior Seaway: a case study from the Upper Cretaceous Bearpaw Formation of southern Alberta, Canada. Palaeogeography, Palaeoclimatology, Palaeoecology. 144:135-160. 1998
- The perisphinctid ammoniteSulaitesn. gen. from the upper Jurassic of the Indo-Southwest Pacific. Alcheringa. 22:231-240. 1998
- Mechanical significance of ammonoid septa with complex sutures. Lethaia. 30:205-212. 1997
- Do limpet pits indicate that desmoceratacean ammonites lived mainly in surface waters?. Lethaia. 28:24-24. 1995
- JURASSIC TAXA RANGES AND CORRELATION CHARTS FOR THE CIRCUM-PACIFIC - PREFACE. Newsletters on Stratigraphy. 31:R3-R4. 1994
- On alleged negative buoyancy of ammonoids. Lethaia. 26:246-246. 1993
- CORRELATION OF JURASSIC EVENTS IN SOUTH-AMERICA - SANTIAGO, CHILE, 27 NOVEMBER 5 DECEMBER 1992. Episodes. 15:267-268. 1992
- Mesozoic Tethyan strata of Thakkhola, Nepal: evidence for the drift and breakup of Gondwana. Palaeogeography, Palaeoclimatology, Palaeoecology. 88:193-218. 1991
- Chamber growth in ammonites inferred from colour markings and naturally etched surfaces of Cretaceous vascoceratids from Nigeria. Lethaia. 24:271-287. 1991
- The first find of Eurycephalitinae (Jurassic Ammonitina) in New Zealand and its biogeographic implications. Journal of Paleontology. 65:689-693. 1991
- Shell microstructure and ecology of the Cretaceous coleoid cephalopod Naefia from the Santonian of Japan. Cretaceous Research. 12:47-54. 1991
- Biostratigraphy of the upper Bajocian-middle Callovian (Middle Jurassic), South America. Journal of South American Earth Sciences. 4:149-157. 1991
- JAPAN AND SOUTH-EAST ASIA .4.. Newsletters on Stratigraphy. 24:81-108. 1991
- JURASSIC TAXA RANGES AND CORRELATION CHARTS FOR THE CIRCUM PACIFIC - PREFACE. Newsletters on Stratigraphy. 24:R3-R3. 1991
- Paleobiogeography of the Ancient Pacific. Science The Scientific monthly. 249:680-680. 1990
- Mosasaur tooth marks on the ammonite Placenticeras from the Upper Cretaceous of Alberta, Canada. Canadian Journal of Earth Sciences. 27:469-472. 1990
- SOUTH-AMERICA AND ANTARCTIC PENINSULA - MIDDLE JURASSIC OF SOUTH-AMERICA AND ANTARCTIC PENINSULA. Newsletters on Stratigraphy. 21:105-128. 1990
- Segmental growth in planulate ammonites: inferences on costal function. Lethaia. 22:95-100. 1989
- The middle jurassic Bathonian-Callovian ammonites zones of the Argentine-Chilean andes. Geobios. 22:553-597. 1989
- MIDDLE JURASSIC AMMONITES OF TIBET AND THE AGE OF THE LOWER SPITI SHALES. Palaeontology. 31:295-339. 1988
- 1ST RECORD OF BATHONIAN BULLATIMORPHITES (JURASSIC, AMMONITINA) FROM KACHCHH, INDIA. Journal of Paleontology. 62:148-150. 1988
- Nautiloid septal strength: revisited and revised concepts. Alcheringa. 12:123-128. 1988
- Faunal associations of the Middle Jurassic ammonite genus Macrocephalites in Kachchh, western India. Canadian Journal of Earth Sciences. 24:1570-1582. 1987
- The Bajocian (Jurassic) ammonite fauna of Oaxaca, Mexico. Journal of Paleontology. 60:1220-1271. 1986
- The Jurassic ammonite Pseudolioceras (Tugurites) of the Bering Province. Canadian Journal of Earth Sciences. 23:1042-1045. 1986
- Exploding Nautilus camerae does not test septal strength index. Lethaia. 18:348-348. 1985
- Progress report on the Middle Jurassic ammonite zones of Kachchh, W. India. Newsletters on Stratigraphy. 14:1-11. 1985
- The Siquisique ophiolites, Northern Lara State, Venezuela: A discussion on their Middle Jurassic ammonites and tectonic implications. Bulletin of the Geological Society of America. 96:1050-1050. 1985
- GAUGING THE DURATION OF STAGES - A NEW APPROACH FOR THE JURASSIC. Episodes. 7:26-28. 1984
- The connecting rings of Nautilus and Mesozoic ammonoids: implications for ammonoid bathymetry. Lethaia. 15:373-384. 1982
- AMMONOID FAUNA FROM THE EARLY MIDDLE JURASSIC OF MENDOZA PROVINCE, ARGENTINA. Journal of Paleontology. 56:11-41. 1982
- MESOZOIC AMMONITES FROM THE SPONG VALLEY, ZANSKAR, N W INDIA. Journal of the Geological Society of India. 23:263-&. 1982
- Function of cameral water in Nautilus. Paleobiology. 6:168-172. 1980
- Septum morphology and bathymetry in cephalopods. Paleobiology. 6:48-50. 1980
- Troublesome definition of the Lower/Middle Jurassic boundary. Canadian Journal of Earth Sciences. 16:2060-2062. 1979
- The Circum-Pacific Jurassic Research Group. Lethaia. 11:314-314. 1978
- ALASKINIA-NOM-NOV FOR ALASKOCERAS-WESTERMANN, 1969 NON MILLER AND KUMMEL, 1945 - JURASSIC-AMMONITINA. Journal of Paleontology. 52:604-604. 1978
- 1ST OCCURRENCE, SYSTEMATICS, AND FUNCTIONAL-MORPHOLOGY OF NIPPONITES (CRETACEOUS LYTOCERATINA) FROM AMERICAS. Journal of Paleontology. 51:367-372. 1977
- Sutural inversion in a heteromorph ammonite and its implication for septal formation. Lethaia. 9:357-361. 1976
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conference paper
- Ammonite biostratigraphy and correlations in the Upper Jurassic-lowermost Cretaceous La Caja Formation of North-Central Mexico (Sierra de Catorce, San Luis Potosi). ADVANCING RESEARCH ON LIVING AND FOSSIL CEPHALOPODS. 463-492. 1999
- Circum-Gondwanan ammonite correlation at the Bathonian-Callovian boundary. ADVANCES IN JURASSIC RESEARCH. 485-491. 1996
- Correlating New Zealand regional stages by ammonites. ADVANCES IN JURASSIC RESEARCH. 93-99. 1996
- New Mid-Jurassic Ammonitina from New Zealand: Implications for biogeography and oceanography. ADVANCES IN JURASSIC RESEARCH. 179-185. 1996
- COMPARISON OF THE RELATIVE STRENGTH OF SIPHUNCLES WITH PROCHOANITIC AND RETROCHOANITIC SEPTAL NECKS BY FINITE-ELEMENT ANALYSIS. AMMONOIDEA: ENVIRONMENT, ECOLOGY, AND EVOLUTIONARY CHANGE. 85-97. 1993
- GLOBAL BIO-EVENTS IN MIDJURASSIC AMMONITES CONTROLLED BY SEAWAYS. AMMONOIDEA: ENVIRONMENT, ECOLOGY, AND EVOLUTIONARY CHANGE. 187-226. 1993
- FORM AND FUNCTION OF ORTHOCONIC CEPHALOPOD SHELLS WITH CONCAVE SEPTA. Journal of Paleontology. 31-31. 1977