Dr. Marrett's research concentrates on deformation processes in the upper continental crust where folds, faults, and opening-mode fractures are the most important products. This work is applicable to a wide range of human concerns such as natural hazards (e.g., earthquakes, volcanoes) and the flow of fluids through rock (e.g., hydrocarbons, water, contaminants). Some common themes that relate his disparate interests are quantitative field observations and analysis, especially using techniques that address spatial and size scaling of structures. Dr. Marrett currently has on-going projects that address active faulting and geyser eruption patterns in the Central Andes of Argentina and Chile, detachment folding and curved orogenic belt development in the Sierra Madre Oriental of Mexico, and opening-mode fracturing in numerous areas.

Areas of Expertise

Structural geology, tectonics, deformation processes in the upper continental crust, folds, faults, opening-mode fractures, fluid flow through fracture systems, applications of fractals, natural hazards


Excellence in Oral Presentation Award, Honorable Mention - Society of Economic Paleontologists and Mineralogists (2001)

Knebel Distinguished Teaching Award - University of Texas at Austin (1999)

Big XII Faculty Fellowship - University of Texas at Austin (1998)

Fullbright Fellowship for research in Argentina - GSA (1987 - 1988)

Grants-in-Aid for field research in Argentina - Sigma Xi (1986)

Grant-in-Aid for field research in Argentina - AAPG (1986)

Harold T. Stearns Fellowship Award for field research in Argentina - GSA (1986)

Sage Graduate Fellowship for Ph.D. research - Cornell University (1984 - 1985)

Eleanor Tatem Fellowship for Ph.D research - Cornell University (1984 - 1985)

Outstanding Graduating Senior Award - University of California at Santa Cruz (1984)

ARCS Foundation Fellowship - University of California at Santa Cruz (1980 - 1981)

Priscilla Parkins Memorial Award - University of California at Santa Cruz (1979)

Amoco Foundation Fellowship - University of California at Santa Cruz (1978 - 1982)

Field Trip Leader, on Structure of the Sierra Madre Oriental fold-thrust belt, Mexico, GEO 381E (2005)

Researcher, Interaction of deformation and magmatism at the Southern end of the Altiplano-Puna plateau, Cerro Blanca Caldera, Argentina (2005)

Chair, Structural Geology and Tectonics Division, Short Course Committee, Geological Society of America (2005)

Leader, Short Course, Fabrics, Kinematics, Scaling, and Growth of Brittle Faults: short course for Universidade do Rio Grande do Norte, Natal, Brazil (2004)

Researcher, Fracture development and scaling in siliciclastic strata,, Quebrada de Humahuaca, Argentina (2004)

Field Trip Leader, On Amazcala and Amealco calderas, Queretaro, Mexico (2004)

Researcher, Scaling of deformation bands, Arches National Park, Utah (2004)

Teaching at departmental field camp, Field mapping in the Big Horn basin, Wyoming and McCarthy Mts., Big Belt Mts., and Pioneer Mts., Montana, Departmental field camp (2004)

Research, Scaling of deformation bands, Tucano basin, Brazil (2004)

Research, Spatial scaling of faults in siliciclastic strata, Buckskin Mts., Arizona (2004)

Leader, Short Course, Fractured Reservoir Characterization and Modeling (with S. Laubach and J. Olson): short course for American Association of Petroleum Geologists, Austin, Texas (2003)

Leader, Short Course, Observaciones y Entendimientos Nuevos de Fracturas Extensionales: short course for Universidad Nacional de Salta, Salta, Argentina (2003)

Member, Editorial Board, Revista Mexicana de Ciencias Geológicas, Sociedad Geológica Mexicana (2003)

Field Trip Leader, on Deformation Mechanisms, Strain Measurement, and Rheological Evolution , Sierra Madre Oriental, Mexico (2003)

Research, Fracture development and scaling in siliciclastic strata,, Teton Mts., Wyoming (2003)

Teaching at departmental field camp, Field mapping in the Paradox basin, Utah, San Juan basin and San Juan Mts., Colorado, and Rio Grande rift, New Mexico (2003)

Research, Kinematics of active deformation in the Central Andean volcanic arc, Chile (2003)

Research, Regional structural traverse of the Altiplano-Puna plateau, Argentina, Argentina (2003)

Research, Structure and kinematic development of the Fraile depression, Altiplano-Puna plateau, Argentina (2003)

Research, Interaction of deformation and magmatism at the southern end of the Altiplano-Puna plateau, Sierra de San Buenaventura, Argentina (2003)

Research, Temporal complexity of eruptions at proximal geysers, El Tatio geyser field, Chile (2003)

Member, Editorial Board, Revista Mexicana de Ciencias Geológicas, Sociedad Geológica Mexicana (2003)

Member, Structural Geology and Tectonics Division, Short Course Committee, Geological Society of America (2003)

Leader, Field Trip, Genesis and Controls of Reservoir Scale Carbonate Deformation, Monterrey Salient, Mexico (with F. Montroy-Santiago): field trip for Fracture Research and Applications Consortium, Monterrey, Mexico (2002)

Member, Editorial Board, Geological Society of America (2002 - 2004)

Field Trip Leader, on Structure of the Sierra Madre Oriental fold-thrust belt, , Mexico (2002)

Teaching at departmental field camp, Field mapping in the Big Horn basin, Wyoming and McCarthy Mts. and Big Belt Mts., Montana, Montana (2002)

Field Trip Leader, Genesis and Controls of Reservoir Scale Carbonate Deformation, Monterrey Salient, Mexico, Santiago for Fracture Research and Application Consortium, Monterrey, Mexico (2002)

Member, Editorial Board, Geological Society of America (2002 - 2004)

Leader, Field Trip, Genesis and Controls of Reservoir Scale Carbonate Deformation, Monterrey Salient, Mexico (with S. Eguiluz de Antuñano and F. Montroy-Santiago): field trip for joint international conference of Asociación Mexicana de Geólogos Petrolero (2001)

Field Trip Leader, Genesis and Controls of Reservoir Scale Carbonate Deformation, Monterrey Salient, Mexico, Asociación Mexicana de Geólogos Petroleros and American Association of Petroleum Geologists, Veracruz, Mexico (2001)

Research, Fracture development and scaling in carbonate strat, Sierra Madre Oriental, Mexico (2001)

Teaching at departmental field camp, Field mapping in the Big Horn basin, Wyoming and Big Belt Mts. And McCarthy Mts., Montana (2001)

Field Trip Leader, on Structure of the Sierra Madre Oriental Fold-thrust belt, Mexico (2001)

Field Trip Leader, on Stratigraphy and structure of Sierra Madre Oriental, Mexico, Devon Energy Corporation, Mexico (2001)

Field Trip Leader, Enchanted Rock (60 7th grade students), Clint Small Middle School (2001)

On-air-call, Radio Show on Earth Day, KLBJ Radio Station (2001)

On Camera Interview, Central Texas Seismicity, KTBC television station (2001)

Leader, Short Course, Fractured Reservoir Characterization and Modeling (with S. Laubach and J. Olson): short course for American Association of Petroleum Geologists, Austin, Texas (2000)

Field Trip Leader, Fractured Reservoir Characterization and Modeling, American Association of Petroleum Geologists (2000)

Teaching at departmental field camp, Field mapping in the Big Horn basin, Wyoming and Big Belt Mts., Montana (2000)

Research, Origin of sand pipes, Lake Powell, Utah (2000)

Research , Fracture development and scaling in the carbonate strata, Sierra Made Oriental, Mexico (2000)

Co-Chair, Short Course Committee, Gulf Coast Association of Geological Societies, Annual Meeting (2000 - 2002)

Scientific Research, Kinematics and mechanisms of detachment folding at Reed Walsh (Utah), to be entered (1999)

Leader, Short Course, Fractured Reservoir Characterization and Modeling (with S. Laubach and J. Olson): short course for American Association of Petroleum Geologists, Austin, Texas (1999)

Leader, Field Trip, Stratigraphy and Structure of Jurassic and Cretaceous Rocks of the Sierra Madre Oriental, Northeastern Mexico (with J. Wilson, W. Ward, R. Camerlo, and M. Aranda-García): field trip for American Association of Petroleum Geologists annual meeting, S (1999)

Convener, Late Cenozoic Evolution of the , AGU fall meeting special session (1999)

Field Trip Leader, Fracture development in the Austin area, American Association of Petroleum Geologists (1999)

Research, Kinematics of salient development in the Monterrey salient, Sierra Madre Oriental fold-thrust belt, Mexico (1999)

Teaching at departmental field camp, Field mapping in the Big Horn basin, Wyoming and Big Belt Mts, Montana (1999)

Research, Fold geometries in the Carmel Fm, San Rafael swell, Utah (1999)

Field Trip Leader, Stratigraphy and structure of Jurassic and Cretaceous rocks of the Sierra Madre Oriental, Northeastern Mexico, American Association of Petroleum Geologists annual Meeting (1999)

On Camera Interview, Highway 360 rock fall, KEYE television station (1999)

Scientific Research, Comparison of extension rates determined from faults, earthquakes and geodesy at Yucca Mountain (Nevada), to be entered (1998)

Leader, Short Course, Análisis Geológico de Yacimientos Naturalmente Fracturados: short course for Ecopetrol, Bogotá, Colombia (1998)

Leader, Field Trip, Structure and Sequence Stratigraphy of the Sierra Madre Oriental (with J. Wilson and W. Ward): field trip for Mobil Technology Corp., Monterrey, Mexico (1998)

Research, Kinematics of folding and salient development in the Monterrey salient, Sierra Madre Oriental fold-thrust belt, Mexico (1998)

Research, Fracture development and scaling in carbonate strata, Sierra Madre Oriental, Mexico (1998)

Research, Faulting in the Yucca Mountain are, Nevada (1998)

Teaching at departmental field camp, Field mapping in the Big Horn basin, Wyoming and Big Belt Mts, Montana (1998)

Research, Fracture development and scaling in the Weber sandstone, Uinta Mountains, Utah (1998)

Field Trip Leader, Structure and tectonics of Sierra Madre Oriental, Mexico, Mobil Technology Corp. (1998)

Research, Structure and tectonics of the southern Andes, Argentina, Argentina (1998)

Panelists, Uncertainty and Scaling Panel, American Rock Mechanics Association (1998)

Chair, Reservoir Deformation Research Group, American Association of Petroleum Geologists (1998)

Scientific Research, Kinematics of fold-thrust belt salients at two scales in the Sierra Madre Oriental (Mexico), to be entered (1997)

Research, Fracture development and scaling in the Marble Falls Limestone, Pedernales Falls State Park, Texas (1997)

Research, Fold geometries in the Carmel Fm, San Rafael swell, Utah (1997)

Field Trip Leader, Fault-related rocks of the Wasatch normal fault, Utah (1997)

Research, Kinematics of folding in the San Julian uplift, Sierra Madre Oriental fold-thrust belt, Mexico (1997)

Research, Fracture development and scaling in the Weber sandstone, Uinta Mountains, Utah (1997)

Teaching at departmental field camp, Field mapping in the Big Horn basin, Wyoming and Big Belt Mts, Montana (1997)

Research, Kinematics of folding and salient development in the Monterrey salient, Sierra Madre Oriental fold-thrust belt, Mexico (1997)

Vice-Chair, Reservoir Deformation Research Group, American Association of Petroleum Geologists (1997)

On Camera Interview, Balcones fault zone, KEYE television station (1997)

Scientific Research, Comparison of intracontinental kinematics and plate motions at different time scales in the Central Andes, to be entered (1996)

Leader, Field Trip, Fractures in central Texas (with S. Laubach): field trip for Amoco Production Co., Austin, Texas (1996)

Leader, Short Course, Construcción de Secciones Balanceadas: short course for Instituto Mexicano del Petroleo, Mexico City, Mexico (1996)

Convener, Scale effects of fluid flow and fractures, GSA annual meeting theme session (1996)

Convener, Fractured aquifers and petroleum reservoirs, Symposium at GSA South-Central Section Meeting (1996)

Field Trip Leader, Structure of the Monterrey salient, Sierra Madre Oriental fold-thrust belt, Mexico (1996)

Field Trip Leader, Fractures in central Texas, Amoco Production Co. (1996)

Field Trip Leader, Fractures in the Sawtooth Mts, Montana (1996)

Research, Fracture analysis in the San Juan basin, New Mexico (1996)

Research, Structure and tectonics of the Central Andes, Chile and Argentina (1996)

Member, Best Paper Award Committee, Geological Society of America, Structural Geology and Tectonics Division (1996 - 1999)

Scientific Research, Relationship of active tectonics to mass wasting processes in the Cordillera Oriental of Northwestern Argentina, to be entered (1995 - 1998)

Scientific Research, Kinematics and mechanisms of detachment folding in the Sierra Madre Oriental (Mexico), to be entered (1995)

Leader, Short Course, Análisis Geológico de Yacimientos Naturalmente Fracturados: short course for Pemex Exploración y Producción, Poza Rica, Mexico (1995)

Leader, Field Trip, Structure and Tectonics of the Sierra Madre Oriental (with G. Prost): field trip for Amoco Production Co., Monterrey, Mexico (1995)

Leader, Short Course, Construcción de Secciones Balanceadas: short course for Pemex Exploration and Production, Poza Rica, Mexico (1995)

Field Trip Leader, Structure of the Big Bend and Marathon regions, West Texas (1995)

Research, Kinematics of the Sierra Madre Oriental, Mexico (1995)

Teaching at departmental field camp, Field mapping in the San Juan Mts., Colorado and Big Belt Mts, Montana (1995)

Field Trip Leader, Structure and tectonics of Sierra Madre Oriental, Mexico, Amoco Production Co (1995)

Scientific Research, Scaling of extension fracture systems and fluid flow, to be entered (1994)

Leader, Short Course, Construcción de Secciones Balanceadas: short course for Pemex Exploration and Production, Poza Rica, Mexico (1994)

Field Trip Leader, Faulting at Flamborough Head, England (1994)

Research, Fracture analysis in the northern Canadian Rocky Mt. , Foothills (1994)

Research, Fracture analysis in the southern Canadian Rocky Mt. , Foothills (1994)

Scientific Research, Fracture analysis of the Rocky Mountain foothills (Canada), to be entered (1993 - 1994)

Field Trip Leader, Structure and stratigraphy of the southern Pyrenees Mts, Spain (1993)

Research, Fracture analysis in the northern Canadian Rocky Mt, Foothills (1993)

Research, Faulting at Landers and the Volcanic Tableland, California (1993)

Field Trip Leader, Geology and tectonics of the southern San Andreas fault system, California (1993)

Scientific Research, Regional structure of the Neuquen basin (Argentina), to be entered (1992)

Scientific Research, Regional structure of the Atlas Mountains (Tunisia), to be entered (1992)

Scientific Research, Regional structure and tectonics of the Sierra Madre Oriental (Mexico), to be entered (1992 - 1993)

Research, Structure of the Sierra Madre Oriental, Mexico (1992)

Field Trip Leader, Turner Valley structure of the southern Alberta Foothills, Canada (1992)

Field Trip Leader, Structure of the Meguma terrane in the Lunenburg and Ecum Secum areas, Nova Scotia, Canada (1992)

Research, Structural styles of the Atlas Mts, Tunisia (1992)

Research, Structure of the Sierra Madre Oriental, Mexico (1992)

Research, Structural styles of the Neuquén foreland basin, Argentina (1992)

Scientific Research, Regional structure of the Rocky Mountain foothills (Canada), to be entered (1991 - 1992)

Research, Fold geometries and mechanisms in the northern Canadian Rocky Mt, Foothills (1991)

Field Trip Leader, Rocky Mt. thrust belt in southern Canada, Canada (1991)

Field Trip Leader, Thrust/foreland structures in the northern U.S. Rocky Mts, Wyoming and Montana (1991)

Field Trip Leader, Ouachita Mts. thin-skinned fold and thrust belt, Oklahoma (1991)

Field Trip Leader, Fault geometries along the Somerset coast, England (1991)

Scientific Research, Structural interpretation in fold-dominated contractional terranes, to be entered (1990 - 1992)

Research, Fault kinematics and paleomagnetic rotations in the Salar de Antofalla, Puna plateau, Central Andes, Argentina (1990)

Scientific Research, Size distributions of brittle fault populations and their relationships with finite strain and the b-value of earthquakes, to be entered (1989 - 1992)

Research, Structure and kinematics of the Puna plateau, Quebrada Humahuaca, and Quebrada Pucará, Central Andes, Argentina, Argentina (1987 - 1988)

Research, Structure and kinematics of the Quebrada del Toro, Central Andes, Argentina, Argentina (1986)

Field Trip Leader, Structure of the central Appalachian foreland fold-thrust belt, to be entered (1986)

Scientific Research, Structural analysis of kinematics and structural geometry associated with the development of Puna plateau (Argentina), to be entered (1985 - 1989)

Research, Structure and kinematics of the Valle Calchaqui, Central Andes, Argentina, Argentina (1985)

Scientific Research, Development of graphical and numerical methods for kinematic analysis of fault-slip data and development of associated field techniques, to be entered (1984 - 1989)

to be entered, Field mapping in the Northern Sierra Nevada Mountains., California (1983)

Undergraduate Course Work , Field mapping in the Coast Ranges, University of California, Santa Cruz (1982 - 1983)

Undergraduate Course Work , Numerous field trips in the Coast Ranges and Sierra Nevada, California, University of California, Santa Cruz (1980 - 1983)

Member, Geological Society of America

Member, American Geophysical Union

Member, American Association of Petroleum Geologists

Member, Sociedad Geológica Mexicana

Member, International Association of Structural/Tectonic Geologists

Reviewer, Technical papers for journals, Nature

Reviewer, Technical papers for journals, Geology

Reviewer, Technical papers for journals, Journal of Structural Geology

Reviewer, Technical papers for journals, Geological Society of America Bulletin

Reviewer, Technical papers for journals, Journal of Geophysical Research

Reviewer, Technical papers for journals, Geophysical Research Letters

Reviewer, Technical papers for journals, SOE Formation Evaluation

Reviewer, Technical papers for journals, Ore Geology Reviews

Reviewer, Technical papers for journals, Rocky Mountain Association of Geologists Guidebook

Reviewer, Technical papers for journals, Journal of African Earth Science

Reviewer, Technical papers for journals, Revista Mexicana de Ciencias Geológicas

Reviewer, Technical papers for journals, Boletín de la Sociedad Geológica Mexicana

Reviewer, Technical Research Proposals, National Science Foundation, Division of Earth Sciences

Reviewer, Technical Research Proposals, American Chemical Society, Petroleum Research Fund

Reviewer, Technical Research Proposals, Department of Energy, Office of Basic Energy Sciences

Dr. Marrett supervisees 6 PhD and 3 MS students at the moment. They are involved in a variety of projects that revolve around field work in South America, Central America, Mexico, and the US Rocky Mountains)


Graduate Students

Lauren K Copley, M.S., expected 2015 (Co-supervisor)


to be entered, Second Congreso Nacional de IngenierÍa en Geociéncias, Ciudad Madero, México (2005)

to be entered, Centennial meeting of the Sociedad Geológica Mexicana, Querétaro, México (2004)

to be entered, Centro de Geociencias, Universidad Nacional Autónoma de México, Querétaro, México (2004)

to be entered, Desert Research Institute, University of Nevada, Reno, Nevada (2004)

Hardrock/Structure Seminar, Department of Geological Sciences, University of Texas at Austin, Austin, Texas (2004)

Volcanoes of the Central Andes (2 classes of 6th grade students), Clint Small Middle School, to be entered (2004)

Technical Sessions, Department of Geological Sciences, University of Texas at Austin, Austin, Texas (2003)

to be entered, Department of Petroleum and Geosystems Engineering, University of Texas at Austin, Austin, Texas (2002)

Technical Sessions, Department of Geological Sciences, University of Texas at Austin, Austin, Texas (2002)

Tectonics of the Central Andes, Lakeway Men's Breakfast Club, to be entered (2002)

to be entered, School of Geological Sciences, Freie Universität Berlin, Berlin, Germany (2001)

Hardrock/Structure Seminar, Department of Geological Sciences, University of Texas at Austin, Austin, Texas (2001)

to be entered, Department of Geological Sciences, Cornell University, Ithaca, New York (2000)

to be entered, Repsol-YPF-Maxus, Denver, Colorado (2000)

to be entered, Conoco Inc, Houston, Texas (2000)

Hardrock/Structure Seminar, Department of Geological Sciences, University of Texas at Austin, Austin, Texas (2000)

When the Earth Quakes, UT College of Natural Sciences Outreach Lecture Series, to be entered (2000)

Use of Math in Science, two classes of 6th grade students, Clint Small Middle School, to be entered (2000)

Earthquakes and Volcanoes, Science Day, Four groups of 1st through 5th grade students, Mills Elementary School, to be entered (2000)

to be entered, Department of Geosciences, University of Houston, Houston, Texas (1999)

to be entered, Department of Geological Sciences, University of Tennessee, Knoxville, Tennessee (1999)

to be entered, Department of Geology, Imperial College, University of London, London, England (1999)

to be entered, Pemex Exploración y Producción, Villahermosa, Mexico (1999)

to be entered, Marathon Oil Co, Denver, Colorado (1999)

Technical Sessions, Department of Geological Sciences, University of Texas at Austin, Austin, Texas (1999)

Hardrock/Structure Seminar, Department of Geological Sciences, University of Texas at Austin, Austin, Texas (1999)

to be entered, First National Meeting of Earth Sciences, sponsored by the Sociedad Geológica Mexicana, Mexico City, México (1998)

to be entered, Department of Geosciences, University of Tulsa, Tulsa, Oklahoma (1998)

to be entered, Department of Geological Sciences, University of Colorado at Boulder, Boulder, Colorado (1998)

Forum on New Directions for U.S. Rock Mechanics, American Rock Mechanics Association, Pacific Grove, California (1998)

to be entered, Tulsa Geological Society, Tulsa, Oklahoma (1998)

Symposium on Thrust tectonics, Houston Geological Society , Houston, Texas (1998)

Symposium on Fractured reservoirs, practical exploration and development strategies, Rocky Mountain Association of Geologists , Denver, Colorado (1998)

to be entered, Maxus Energy Corp, Dallas, Texas (1998)

Hardrock/Structure Seminar, Department of Geological Sciences, University of Texas at Austin, Austin, Texas (1998)

Session on New technology in the exploration and exploitation of fractured reservoirs, American Association of Petroleum Geologists annual meeting, Dallas, Texas (1997)

to be entered, Chevron Petroleum Co, Midland, Texas (1997)

Hardrock/Structure Seminar, Department of Geological Sciences, University of Texas at Austin, Austin, Texas (1997)

to be entered, Institute for Geophysics, University of Texas at Austin, Austin, Texas (1997)

Earthquakes and Volcanoes, Science Day, four groups of 3rd and 4th grade students, Patton Elementary School, to be entered (1997)

A Traverse across the Central Andes, Austin Gem and Mineral Society, Austin, Texas (1997)

to be entered, Department of Geological Sciences, University of Texas at El Paso, El Paso, Texas (1996)

to be entered, Facultad de Ciencias Naturales, Universidad Nacional de Salta, Salta, Argentina (1996)

Symposium on Fractured aquifers and petroleum reservoirs, Geological Society of America South-Central Section meeting, Austin, Texas (1996)

Users group for project studying Using microstructure observations to quantify fracture properties and improve reservoir simulations, Department of Energy , Austin, Texas (1996)

Users group for project studying New methods to quantify natural fracture attributes, Gas Research Institute , Austin, Texas (1996)

Volcanoes, two classes of 3rd grade students, Patton Elementary School, to be entered (1996)

Volcanoes, fifty 8th grade students, National Science Foundation Summer Camp at University of Texas at Austin, Austin, Texas (1996)

to be entered, Instituto de GeofÍsica, Universidad Nacional Autónoma de México, Mexico City, Mexico (1995)

to be entered, Southwest Research Institute, San Antonio, Texas (1995)

to be entered, Programs in Geosciences, University of Texas at Dallas, Dallas, Texas (1995)

to be entered, British Petroleum Exploration Co, Bogotá, Colombia (1995)

Hardrock/Structure Seminar, Department of Geological Sciences, University of Texas at Austin, Austin, Texas (1995)

Users group for project studying New methods to quantify natural fracture attributes, Gas Research Institute , Dallas, Texas (1995)

to be entered, Institute for Geophysics, University of Texas at Austin, Austin, Texas (1995)

Fault populations, Tectonic Studies Group special meeting , Edinburgh, Scotland (1994)

to be entered, Sociedad Geológica Mexicana, Chihuahua, Mexico (1994)

to be entered, Asociación Mexicana de Geólogos Petroleros, Poza Rica, Mexico (1994)

Technical Sessions, Department of Geological Sciences, University of Texas at Austin, Austin, Texas (1994)

Applications of strain, from microstructures to mountain belts, Geological Society of America Penrose Conference , Halifax, Canada (1992)

to be entered, Department of Geology, University of Southampton, Southampton, England (1991)

to be entered, Department of Earth Sciences, University of Liverpool, Liverpool, England (1991)