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
- Hydrostatics, propulsion and life-habits of the Cretaceous ammonoid Baculites. Revue de Paleobiologie. 32:249-265. 2013
- The Gravesia homeomorphs from the latest Kimmeridgian of Mombasa, Kenya. Revue de Paleobiologie. 31:13-25. 2012
- 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. 1999:21-28. 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
- Post-mortem behaviour of Early Paleozoic nautiloids and paleobathymetry. Palaontologische Zeitschrift. 70:405-424. 1996
- Mid-Jurassic Ammonitina from the Central Ranges of Irian Jaya and the origin of stephanoceratids. Hantkeniana. 1:105-118. 1995
- Do limpet pits indicate that desmoceratacean ammonites lived mainly in surface waters?. Lethaia. 28:24-24. 1995
- A late Bathonian morphoceratid (Jurassic, Ammonitina) from Peru. Mitteilungen - Bayerischen Staatssammlung fur Palaontologie und Historische Geologie. 35:27-37. 1995
- Origin of jurassic ammonite concretions assemblages at Alfeld, Germany: a biogenic alternative. Palaontologische Zeitschrift. 68:473-490. 1994
- 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
- Growth rates of ammonites estimated from Aptychi. Geobios. 26:203-208. 1993
- Paleoecology of Triassic ammonoids. Geobios. 26:373-392. 1993
- The Jurassic of the circum-Pacific. The Jurassic of the circum-Pacific. 1993
- CORRELATION OF JURASSIC EVENTS IN SOUTH-AMERICA - SANTIAGO, CHILE, 27 NOVEMBER 5 DECEMBER 1992. Episodes. 15:267-268. 1992
- Formation and function of suspended organic cameral sheets in Triassic ammonoids—discussion. Palaontologische Zeitschrift. 66:437-441. 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
- Bathymetric Limits of a Carboniferous Orthoconic Nautiloid Deduced by Finite Element Analysis. Palaios. 4:157-157. 1989
- 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
- Application of buckling equations to the functional morphology of nautiloid and ammonoid phragmocones. Historical Biology Ichnos. 1:225-231. 1988
- Duration of Jurassic stages based on averaged and scaled subzones. Recent advances in quantitative stratigraphic correlation techniques. International symposium papers, Kharagpur, 1983. 90-100. 1988
- First record of Bathonian Bullatimorphites (Jurassic, Ammonitina) from Kachchh, India. Journal of Paleontology. 62:148-150. 1988
- Middle Jurassic ammonite biogeography supports ambi-Tethyan origin of Tibet. Geological Society Special Publication. 37:235-239. 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
- Post-mortem descent with septal implosion in Silurian nautiloids. Palaontologische Zeitschrift. 59:79-97. 1985
- Progress report on the Middle Jurassic ammonite zones of Kachchh, W. India. Newsletters on Stratigraphy. 14:1-11. 1985
- Middle Jurassic ammonite evolution in the Andean province and emigration to tethys. Lecture Notes in Earth Sciences. 1:6-34. 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. 7:26-29. 1984
- Jurassic ammonite biogeography of western North America: the tectonic implications.. Geological Association of Canada Special Paper. 27:121-141. 1984
- Jurassic-Cretaceous biochronology and biogeography of North America.. Geological Association of Canada Special Paper. 27. 1984
- Summary of symposium papers on the Jurassic-Cretaceous biochronology and paleogeography of North America.. Geological Association of Canada Special Paper. 27:307-315. 1984
- The Andean mid-Jurassic Neuqueniceras ammonite assemblage of Cualac, Mexico.. Geological Association of Canada Special Paper. 27:99-112. 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
- Occurrence of the upper triassic bivalveMonotis in Iran. Palaontologische Zeitschrift. 55:173-174. 1981
- 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
- Form and function of orthoconic cephalopod shells with concave septa. Paleobiology. 3:300-321. 1977
- Sutural inversion in a heteromorph ammonite and its implication for septal formation. Lethaia. 9:357-361. 1976
- International Palaeontological Association. Lethaia. 9:316-316. 1976
- Architecture and buoyancy of simple cephalopod phragmocones and remarks on ammonites. Palaontologische Zeitschrift. 49:221-234. 1975
- Model for origin, function and fabrication of fluted cephalopod septa. Palaontologische Zeitschrift. 49:235-253. 1975
- Strength of concave septa and depth limits of fossil cephalopods. Lethaia. 6:383-403. 1973
- New Constitution for the International Palaeontological Association. Lethaia. 6:91-99. 1973
- The case of alleged inversion of septal sutures in ammonites. Lethaia. 5:165-167. 1972
- The Significance of Septa and Sutures in Jurassic Ammonite Systematics. Geological Magazine. 95:441-455. 1958
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book
- Preface. Ed. 223. 1988
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chapter
- FOSSIL INVERTEBRATES | Ammonites. 396-407. 2005
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conference paper
- Modes of e×tinction, pseudo-e×tinction and distribution in Middle Jurassic ammonites: terminology. Canadian Journal of Earth Sciences. 187-195. 2001
- 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
- Correlation of Jurassic events in South America. Episodes. 267-268. 1992
- FORM AND FUNCTION OF ORTHOCONIC CEPHALOPOD SHELLS WITH CONCAVE SEPTA. Journal of Paleontology. 31-31. 1977