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CLAYTON, G. 1971. A Lower Carboniferous miospore assemblage from the Calciferous Sandstone Measures of the Cockburnspath Region of eastern Scotland. Pollen et Spores, 12, 577-600.

CLAYTON, G. 1972. Compression structures in the Lower Carboniferous miospore Dictyotriletes admirabilis Playford. Palaeontology, 1, 121-124.

NEVES, R., GUEINN, K.J., CLAYTON, G., IOANNIDES, N.S., and NEVILLE, R.S.W. 1972. A scheme of miospore zones for the British Dinantian Compte Rendu 7e Congrès International de Stratigraphie et de Géologie du Carbonifère (Krefeld 1971), 1, 347-353.

NEVES, R., GUEINN, K.J., CLAYTON, G., IOANNIDES, N.S. and KRUSZEWSKA, K. 1973. Palynological correlations within the Lower Carboniferous of Scotland and Northern England. Transactions of the Royal Society of Edinburgh, 69, 24-69.

SPINNER, E. and CLAYTON, G. 1973. Spores from the Viséan rocks of Skateraw, East Lothian, Scotland. Pollen et Spores, 15, 139-166.

CLAYTON, G., HIGGS, K., GUEINN, K.J. and VAN GELDER, A. 1974. Palynological correlations in the Cork Beds (Upper Devonian-?Upper Carboniferous) of southern Ireland. Proceedings of the Royal Irish Academy, 74, 145-155.

CLAYTON, G. and GRAHAM, J.R. 1974. Miospore assemblages from the Devonian Sherkin Formation of south-west County Cork, Republic of Ireland. Pollen et Spores, 16, 565-588.

CLAYTON, G., COLTHURST, J.R.S., HIGGS, K., JONES, G.L. and KEEGAN, J.B. 1977. Lower Carboniferous (Tournaisian) miospores and conodonts from County Kilkenny. Geological Survey of Ireland Bulletin, 2, 99-106.

CLAYTON, G., HIGGS, K. and KEEGAN, J.B. 1977. Late Devonian and early Carboniferous occurrences of the miospore genus Emphanisporites McGregor in southern Ireland. Pollen et Spores, 19, 415-425.

CLAYTON, G., COQUEL, R., DOUBINGER, J., GUEINN, K.J., LOBOZIAK, S., OWENS, B. and STREEL, M. 1977. Carboniferous miospores of Western Europe; illustration and zonation. Mededelingen Rijks Geologische Dienst, 29, 1-71.

VAN GELDER, A. and CLAYTON, G. 1978. New data on early Dinantian (early Carboniferous) stratigraphy and sedimentation in South Cork, Ireland.Geologie en Mijnbouw, 57, 25-32.

NAYLOR, D., JONES, P.C. and CLAYTON, G. 1978. The Namurian stratigraphy of Whiddy Island, Bantry Bay, West Cork. Geological Survey of Ireland Bulletin, 3, 235-253.

CLAYTON, G., HIGGS, K., KEEGAN, J.B. and SEVASTOPULO, G.D. 1978. Correlation of the palynological zonation of the Dinantian of the British Isles. Palinologia, 1,137-147.

CLAYTON, G. and HIGGS, K. 1979. The Tournaisian marine transgression in Ireland. Journal of Earth Sciences Royal Dublin Society, 2, 1-10.

CLAYTON, G., GRAHAM, J.R., HIGGS, K., HOLLAND, C.H. and NAYLOR, D. 1980. Devonian rocks in Ireland: a review. Journal of Earth Sciences Royal Dublin Society, 2, 161-183.

PHILLIPS, W.E.A. and CLAYTON, G. 1980. The Dinantian clastic succession of Clare Island, County Mayo. Journal of Earth Sciences Royal Dublin Society,2, 115-135.

CLAYTON, G., JOHNSTON, I.S., SEVASTOPULO, G.D. and SMITH, D.G. 1980. Micropalaeontology of a Courceyan (Carboniferous) borehole section from Ballyvergin, County Clare. Journal of Earth Sciences Royal Dublin Society, 3, 81-100.

CLAYTON, G. and SEVASTOPULO, G.D. 1981. Discussion on the recognition and division of the Tournaisian Series in Britain. Journal of the Geological Society London, 138, 103-105.

CLAYTON, G., KEEGAN, J.B. and SEVASTOPULO, G.D. 1982. Palynology and stratigraphy of late Devonian and early Carboniferous rocks from Ardmore, County Waterford, Ireland. Pollen et Spores, 24, 511-521.

GRAHAM, J.R., RICHARDSON, J.B. and CLAYTON, G.1983. Age and significance of the Old Red Sandstone around Clew Bay, N.W. Ireland. Transactions of the Royal Society of Edinburgh, 73, 245-249.

MARCHANT, T.R., SEVASTOPULO, G.D. and CLAYTON, G. 1984. Preliminary correlation of Irish Tournaisian conodont, foraminiferal and miospore zonal schemes. Compte Rendu 9e Congres International de Stratigraphie et de Géologie du Carbonifère (Urbana 1979), 2, 282-288.

HIGGS, K. and CLAYTON, G. 1984. Tournaisian miospores from Maesbury in the eastern Mendips, England. Journal of Micropalaeontology, 3 (1), 17-28.

SCOTT, A.C., GALTIER, J. and CLAYTON, G. 1985. Distribution of anatomically-preserved floras in the Lower Carboniferous in Western Europe. Transactions of the Royal Society of Edinburgh, 75, 311-340.

CLAYTON, G. 1985. Plant miospores from the Dinantian of Foulden, Berwickshire. Transactions of the Royal Society of Edinburgh, 76, 21-24.

CLAYTON, G. and LOBOZIAK, S. 1985. Early Carboniferous miospores. in THUSU, B. and OWENS, B. (eds.) The Palynostratigraphy of Northeast Libya. Journal of Micropalaeontology, 4 (1), 83-92.

SCOTT, A.C., GALTIER, J. and CLAYTON, G. 1985. A new late Tournaisian (Lower Carboniferous) flora from the Kilpatrick Hills, Scotland. Revue of Palaeobotany and Palynology, 44, 81-99.

CLAYTON, G. 1985. Plant miospores and Dinantian inter-continental correlation. Compte Rendu 10e Congrès International de Stratigraphie et de Géologie du Carbonifère (Madrid 1983). 4, 9-23.

SCOTT, A.C., MEYER-BERTHAUD, B., GALTIER, J., REX, G.M., BRINDLEY, S.A. and CLAYTON, G. 1986.Studies on a new Lower Carboniferous flora from Kingswood near Petticur, Scotland. Revue of Palaeobotany and Palynology, 48, 161-180.

CLAYTON, G., SEVASTOPULO, G.D. and SLEEMAN, A.G. 1986. Carboniferous (Dinantian and Silesian) and Permo-Triassic rocks in south County Wexford, Ireland. Geological Journal, 21, 1-20.

CLAYTON, G., GRAHAM, J.R., HIGGS, K., SEVASTOPULO, G.D. and WELSH, A. 1986. Late Devonian and early Carboniferous of southern Ireland and southwest Britain. Annales de la Société Géologique de Belgique, 109, 103-111.

CLAYTON, G. 1986.Late Tournaisian miospores from the Ballycultra Formation at Cultra, County Down, Northern Ireland. Irish Journal of Earth Sciences, 8, 73-79.

LOBOZIAK, S., CLAYTON, G. and OWENS, B. 1986. Aratrisporites saharaensis sp. nov. : a characteristic Lower Carboniferous miospore species of North Africa. Geobios, 19 (4), 497-503.

COLEMAN, U. and CLAYTON, G. 1987. The palynostratigraphy and palynofacies of the uppermost Devonian and lower Mississippian of Eastern Kentucky, and correlation with Western Europe. Courier Forsch. Inst. Senckenberg, 98, 75-93.

AINSWORTH, N., O’NEILL, M., RUTHERFORD, M.M., CLAYTON, G., HORTON, N.F. and PENNEY, R.A. 1987.Biostratigraphy of the Lower Cretaceous, Jurassic and Upper Triassic of the North Celtic Sea and Fastnet Basins. in: BROOKS, J. and GLENNIE, K. (eds.)Proceedings of the 3rd Conference on the Petroleum Geology of NW Europe (London 1986), 611-622.

HIGGS, K., CLAYTON, G. and KEEGAN, J.B. 1988.Stratigraphic and systematic palynology of the Tournaisian of Ireland. Special Paper No. 7, Geological Survey of Ireland, 1-82.

HIGGS, K., McPHILEMY, B., CLAYTON, G. and KEEGAN, J.B.1988. New data on palynological boundaries within the Irish Dinantian. Revue of Palaeobotany and Palynology, 56, 61-68.

GRAHAM, J.R. and CLAYTON, G. 1988. Devonian rocks in Ireland and their relation to adjacent regions. In: McMILLAN, N.J., EMBRY, A.F. and GLASS, D.J. (eds). Devonian of the World. Canadian Society of Petroleum Geologists (Calgary), 1, 325-346.

LOBOZIAK, S. and CLAYTON, G. 1989. The early Carboniferous palynology and stratigraphy of Northeast Libya. in ARNAUTI, E., OWENS, B. and THUSU, B. eds. 'The Subsurface Palynostratigraphy of Northeast Libya' Special Publication of the University of Garryounis, Libya, 129-149.

ROBESON, D., BURNETT, R. and CLAYTON, G. 1989. The Upper Palaeozoic Geology of the Porcupine, Erris and Donegal Basins, Offshore Ireland. Irish Journal of Earth Sciences, 9(2), 153-175.

CLAYTON, G., HAUGHEY, N., SEVASTOPULO, G.D. and BURNETT, R. 1989. Thermal maturation levels in the Devonian and Carboniferous rocks of Ireland. Geological Survey of Ireland, 36pp.

CLAYTON, G., HAUGHEY, N., SEVASTOPULO, G.D. and BURNETT, R. 1989. Thermal maturation levels in the Devonian and Carboniferous rocks of Ireland.1: 250,000 coloured map. Geological Survey of Ireland Map Series.

CLAYTON, G. 1989. Vitrinite reflectance data from the Kinsale Harbour - Old Head of Kinsale area, Southern Ireland, and its bearing on the interpretation of the evolution of the Munster Basin. Journal of the Geological Society of London, 146, 611-616.

BURNETT, R., CLAYTON. G., HAUGHEY, N., SEVASTOPULO, G.D. and SLEEMAN, A.G. 1990. The organic maturation levels of Carboniferous rocks in south County Wexford, Ireland. Irish Journal of Earth Sciences, 10, 145-155.

CLAYTON, G. and TURNAU, E. 1990. Correlation of the Tournaisian miospore zonations of Poland and the British Isles. Annales Geologorum Poloniae, 60, 45-58.

CLAYTON, G., LOBOZIAK, S., STREEL, M., TURNAU, E. and UTTING, 1991. Palynological events in the Mississippian (Carboniferous) of Europe, North Africa and North America. Courier Forsch. Inst. Senckenberg, 130, 79-84.

PHILCOX, M.E, BAILY, H., CLAYTON, G. and SEVASTOPULO, G.D. 1992. Evolution of the Carboniferous Lough Allen Basin, Northwest Ireland. In Basins on the Atlantic Seaboard: Petroleum Geology, Sedimentology and Basin Evolution, (ed. J. Parnell) Geological Society Special Publication 62, 203-215.

OWENS, B., CLAYTON, G., GAO, L. and LOBOZIAK, S.1992. Miospore correlation of the Carboniferous deposits of Europe and China. Compte Rendu 11e Congres International de Stratigraphie et de Géologie du Carbonifère (Beijing 1987), 3, 189-210.

KEELEY, M.J., LEWIS, C.L.E., SEVASTOPULO, G.D., CLAYTON, G. and BLACKMORE, R. 1993. Apatite fission track data from SE Ireland; implications for post-Variscan burial history. Geological Magazine, 130 (2), 171-176.

AVCHIMOVITCH, V.I., TURNAU, E. and CLAYTON, G. 1993. Correlation of uppermost Devonian and Lower Carboniferous miospore zonations in Byelorussia, Poland and Western Europe. in Streel, M., Sevastopulo, G.D. and Paproth, E. (eds) Devonian-Carboniferous Boundary. Annales de la Société Géologique de Belgique, 115 (2), 453-458.

NAYLOR, D., HAUGHEY, N., CLAYTON, G. and GRAHAM, J.R. 1993. The Kish Bank Basin, offshore Ireland. In Parker, J.R. (ed.) Petroleum Geology of Northwest Europe: Proceedings of the 4th Conference (London 1992), 845-855.

HEMSLEY, A.R., CLAYTON, G. and GALTIER, J. 1994. Further studies on a late Tournaisian (Lower Carboniferous) Flora from Loch Humphrey Burn, Scotland: spore taxonomy and ultrastructure. Revue of Palaeobotany and Palynology, 81, 213-231

TURNAU, E., AVCHIMOVITCH, V.I., BYVSCHEVA, T.V., CLAYTON, G., HIGGS, K. and OWENS, B. 1994. Taxonomy and stratigraphical distribution of Verrucosisporites nitidus Playford and related species. Revue of Palaeobotany and Palynology, 81, 289-295.

CLAYTON, G. 1994. The Applied Geology Unit. In: Wyse Jackson, P. (ed.) In Marble Halls - Geology in Trinity College Dublin. Department of Geology, TCD., 126-128.

FITZGERALD, E., FEELY, M., JOHNSTON, J.D., CLAYTON, G., FITZGERALD, L.J. and SEVASTOPULO, G.D. 1994. The Variscan thermal history of West Clare, Ireland. Geological Magazine, 131 (4), 545-558.

CLAYTON, G. 1995. Carboniferous miospores from the Kingdom of Saudi Arabia. Revue of Palaeobotany and Palynology, 89, 115-123.

GRAHAM, J.R. and CLAYTON, G. 1995. Late Tournaisian conglomerates from County Donegal, NW Ireland; fault controlled sedimentation and overstep during basin extension. Irish Journal of Earth Sciences, 13, 95-105.

CLAYTON, G. 1996. Mississippian miospores. in: Jansonius, J. and McGregor, D.C. (eds) Palynology: principles and applications. American Association of Stratigraphic Palynologists Foundation, 2, 589-596.

PEREIRA, Z., CLAYTON, G. and OLIVEIRA, J. T. 1996. Palynostratigraphy of the Devonian - Carboniferous boundary in Southwest Portugal. Annales de la Société géologique de Belgique, 117 (1), 189-199.

CLAYTON, G. and OWENS, B. 1997. Report of the International Subcommission on the Palaeozoic microflora (CIMP). Proceedings of the XIII Congress on the Carboniferous and Permian (Krakow 1995), 1, 65.

CARSON, B. and CLAYTON, G. 1997. The Dinantian palynostratigraphy of Rügen, north Germany. Proceedings of the XIII Congress on the Carboniferous and Permian (Krakow 1995), 1, 219-227.

TURNAU, E., AVCHIMOVITCH, V.I., BYVSCHEVA, T., CARSON, B., CLAYTON, G. and OWENS, B. 1997. The first appearance of Lycospora pusilla (Ibrahim) Somers and its relationship to the Tournaisian / Viséan boundary. Proceedings of the XIII Congress on the Carboniferous and Permian (Krakow 1995), 1, 289-293.

EVANS, A. and CLAYTON, G. 1998. The geological history of the Ballydeenlea Chalk Breccia, County Kerry, Ireland. Marine and Petroleum Geology, 15, 299-307.

CLAYTON, G., MANGER, W.L. and OWENS, B. 1998. Mississippian palynofloras from the Cuyahoga and Logan Formations of north-eastern Ohio, U.S.A. Journal of Micropalaeontology, 17 (2), 183-91.

COXON, P. and CLAYTON, G. 1999. Light microscopy of fossil pollen and spores. In: Jones, T.P. and Rowe, N.P. (eds) Fossil plants and spores: modern techniques. Geological Society, London, 47-51.

CLAYTON, G. and COXON, P. 1999. Spore and pollen biostratigraphy. In: Jones, T.P. and Rowe, N.P. (eds) Fossil plants and spores: modern techniques. Geological Society, London, 225-229.

CORCORAN, D. and CLAYTON, G. 1999. Interpretation of vitrinite reflectance profiles in the Central Irish Sea area: implications for the timing of organic maturation. Journal of Petroleum Geology, 22 (3), 261-286.

GOODHUE, R. and CLAYTON, G. 1999. Organic maturation levels, thermal history and hydrocarbon source rock potential of the Namurian rocks of the Clare Basin, Ireland. Marine and Petroleum Geology, 16, 667-675.

CLAYTON, G., FILATOFF, J., AL-HAJRI, S. and OWENS, B. 2000. Latest Devonian and Early Carboniferous miospore assemblages from Saudi Arabia. In: Al-Hajri, S. and Owens, B. (eds). Stratigraphic Palynology of Saudi Arabia. GeoArabia Special Publication No. 1, 146-153.

GREEN, P.F., DUDDY, I.R., HEGARTY, K.A., BRAY, R.J., SEVASTOPULO, G.D., CLAYTON, G. and JOHNSTON, D. 2000. The post-Carboniferous evolution of Ireland: evidence from thermal history reconstruction. Proceedings of the Geologists Association, 11, 307-320.

OWENS, B., FILATOFF, J., CLAYTON, G. and AL-HAJRI, S. 2000. Evidence of mid-Carboniferous miospore assemblages from central Saudi Arabia. In: Al-Hajri, S. and Owens, B. (eds). Stratigraphic Palynology of Saudi Arabia. GeoArabia Special Publication No. 1, 154-167.

NAYLOR, D. and CLAYTON, G. 2000. Palynological and maturation data and their bearing on Irish post-Variscan palaeogeography. Irish Journal of Earth Sciences, 18, 33-39.

CLAYTON, G. and BAILY, H. 2000. Organic Maturation Levels of Pre-Westphalian Carboniferous Rocks in Ireland and in the Irish Offshore. In: Whiticar, M.J. and Faber, E (eds). The Search for Deep Gas: Selected Papers presented at the IEA / BMFT International Deep Gas Workshop, Hannover. Geologisches Jahrbuch, D 107, 25-41.

McKERROW, W.S., MacNIOCAILL, C., AHLBERG, P.E., CLAYTON, G., CLEAL, C.J. and EAGAR, R.M.C. 2000. The Late Palaeozoic relations between Gondwana and Laurussia. In: Franke, W., Haak, V., Oncken, O. and Tanner, D. (eds). Orogenic Processes: Quantification and Modelling in the Variscan Belt. Geological Society, London, Special Publications, 179, 9-20.

CORCORAN, D.V. and CLAYTON, G. 2001. Interpretation of vitrinite reflectance profiles in sedimentary basins, onshore and offshore Ireland. In: Shannon, P.M., Haughton, P.D.W. and Corcoran, D.V. (eds). The petroleum exploration of Ireland's Offshore Basins. Geological Society, London, Special Publications, 188, 61-90.

GONZALEZ, F., MORENO, C., SAEZ, R. and CLAYTON, G. 2002. Ore genesis age of the Tharsis Mining District (Iberian Pyrite Belt): a palynological approach. Journal of the Geological Society, London, 159, 229-232.

CLAYTON, G., WICANDER, R. and PEREIRA, Z. 2002. Palynological evidence concerning the relative positions of Northern Gondwana and Southern Laurussia in latest Devonian and Mississippian times. In: Wyse Jackson, P. and Parkes, M.A. (eds). Studies in Palaeozoic palaeontology and biostratigraphy in honour of Charles Hepworth Holland. Special Papers in Palaeontology, 67, 45-56.

NAYLOR, D., PHILCOX, M.E. and CLAYTON, G. 2003. Annaghmore-1 and Ballynamullen-1 wells, Larne-Lough Neagh basins, Northern Ireland. Irish Journal of Earth Sciences, 21, 47-69.

COXON, P. and CLAYTON, G. 2005. Light microscopy of fossil pollen and spores. In: Jones, T.P. and Rowe, N.P. (eds) Fossil plants and spores: modern techniques. University of Science and Technology of China Press, Hefei, China, 51-54 (in Chinese).

CLAYTON, G. and COXON, P. 2005. Spore and pollen biostratigraphy. In: Jones, T.P. and Rowe, N.P. (eds) Fossil plants and spores: modern techniques. University of Science and Technology of China Press, Hefei, China, 248-253 (in Chinese).

COXON, P. and CLAYTON, G. 2005. Palynology. In: Selley, R.C., Cocks, R. and Plimer, I. (eds). Encyclopedia of Geology. Elsevier. 464-469.

HECKEL, P. and CLAYTON, G. 2006. The Carboniferous System. Use of the new official names for the subsystems, series and stages. Geologica Acta, 4 (3), 7-11.

McCORMACK, N., CLAYTON, G. and FERNANDES, P.2006. A historia termica das rochas do Paleozoico Superior da Zona Sul Portuguesa , In: J.A.P. Mirao, J.A.P. and A.C. Balbino, A.C. (eds). VII Congresso Nacional de Geologia Resumos alagardos, VII Congresso Nacional de Geologia, Evora, 2006, 85-88.

HECKEL, P.H. and CLAYTON, G. 2006. Use of the new official names for the Subsystems, Series and Stages of the Carboniferous System in international journals, Proceedings of the Geologists' Association, 117, 393-396.

FERNANDES, P. and CLAYTON, G. 2007. Organic maturation levels and thermal history of the Carboniferous rocks of the Dublin Basin. In: Wong, T. (ed.). Proceedings of the XVth International Congress on Carboniferous and Permian Stratigraphy, Utrecht, 2003, Royal Netherlands Academy of Arts and Sciences, 37-45.

McCORMACK, N., CLAYTON, G. and FERNANDES, P. 2007. The thermal history of the Upper Palaeozoic rocks of southern Portugal. Marine and Petroleum Geology, 24,145-150.

DUGGAN, M.C. and CLAYTON, G. 2008. Colour change in the acritarch Veryhachium as an indicator of thermal maturity. GeoArabia, 13, 125-136.

HEAL, S. and CLAYTON, G. 2008. The palynology of the Hannibal Shale (Mississippian) of north-eastern Missouri, U.S.A. and correlation with Western Europe. Palynology, 32, 27-37.

DONOGHUE, E., TROLL, V.R., SCHWARZOPF, L.M., CLAYTON, G. and GOODHUE, R. 2009. Organic block coatings in block-and-ash flow deposits at Merapi Volcano, central Java. Geological Magazine, 146, 113-120.

GOODHUE, R. and CLAYTON, G. 2010. Palynomorph Darkness Index (PDI) - a new technique for assessing thermal maturity. Palynology, 34, 147-156.

WICANDER, R., CLAYTON, G., MARSHALL, J.E.A., TROTH, I. and RACEY, A. 2011.Was the latest Devonian glaciation a multiple event? New palynological evidence from Bolivia. Palaeogeography, Palaeoclimatology, Palaeoecology, 305, 75-83.

FERNANDES, P., MUSGRAVE, J.A., CLAYTON, G., PEREIRA, Z., OLIVEIRA, J.T., GOODHUE, R. and RODRIGUES, B. 2012. New evidence concerning the thermal history of Devonian and Carboniferous rocks in the South Portuguese Zone. Journal of the Geological Society, 169, 647-654.

NAYLOR, D., AL-RAWI, M.,  CLAYTON, G., FITZPATRICK, M.J. and GREEN, P. F. 2013. Hydrocarbon potential in Jordan. Journal of Petroleum Geology, 36, 205-236.

FERNANDES, P., RODRIGUES, B., BORGES, M., MATOS, V. and CLAYTON, G.  2013. Organic maturation of the Algarve Basin (southern Portugal) and its bearing on thermal history and hydrocarbon exploration. Marine & Petroleum Geology, 46, 210-233.