Research interests:

Palynology, Sequence Stratigraphy, Paleozoic Stratigraphy, conodont Biostratigraphy, paleoenvironmental reconstructions, global changes.

Selected published and technical work

See full publication list in ORCID and ResearcherID profiles:

Machado, G., Vavrdová, M., Fonseca, M., Fonseca, P.E., Rocha, F. 2018. Stratigraphy and Palynology of the Pennsylvanian continental Buçaco Basin (NW Iberia). Geobios. in press
Moreira, N., Machado, G. (accepted). Devonian sedimentation in Western Ossa-Morena Zone and its geodynamic significance. In: The Geology of Iberia: A geodynamic approach. Queseada, C. and Oliveira, J.T. (eds). Springer
Ludman, A., Machado, G., Fernandes, P. 2018. Dating hitherto unfossiliferous turbidites in the silurian sandstone sea, Central and East-Central Maine: A glimmer of hope. Conference: 53rd Annual GSA Northeastern Section Meeting.
Machado, G., Moreira, N., Silvério, G. 2018. Devonian Sedimentation and Paleogeography in the SW boundary of the Ossa-Morena Zone. Congresso Nacional de Geologia São Miguel, Açores. Volume: Vulcanica 2018(II).
Silvério, G. Machado, G., Moreira, N., Barreto, P., Cachão, M. 2017. Conodontes da Formação Pedreira da Engenharia, NW da Zona de Ossa-Morena, Portugal: dados preliminares. Conference: VII Congresso Jovens Investigadores em Geociências, LEG 2017. Centro Ciência Viva de Estremoz, Estremoz, Portugal.
Esteves, C. Machado, G., Pimentel, N. Fonseca, P. 2017. Palynofacies of the Pennsylvanian Brejeira Formation, South Portuguese Zone, SW Portugal. Conference: AASP – The Palynological Society 50th Annual Meeting. Nottingham, UK.
Esteves, C. Machado, G., Barreto, M. Bernardo, J., Hanganu, E., Pimentel, N. Fonseca, P. 2016. Palinofácies da sucessão do Carbónico da Praia de Vale Figueiras (Aljezur, SW Portugal). 2016. VI Congresso Jovens Investigadores em Geociências, LEG 2016. Estremoz, Portugal. Volume: VI

Fernandes, P., Lopes, G., Machado, G., Pereira, Z., Rodrigues, B. 2016. Superimposed thermal histories in the southern limit of the Ossa Morena Zone – Portugal. Geological Magazine1: 1-18

Bagnoli, G., Machado, G., Marjibi, S. 2016. The first record of Cambrian conodonts from the Huqf-Haushi outcrops, Sultanate of Oman, Arabian Peninsula. Rivista Italiana di Paleontologia e Stratigrafia. Vol 122 (2): 235-242

Machado, G., Flores, D. 2015 An effective method for the observation and documentation of highly matured palynomorphs using reflected light microscopy. Palynology. vol. 39 (3): 345-349

Machado, G., Booth, G.A. 2014. Edicaran Palynology. A descriptive catalogue of acritarchs, artifacts, filaments, tissues and macrofossils occurring in Oman. Petroleum Development Oman internal report. Machado, G., 2013. South Oman Correlation of the Amin Formation. Petroleum Development Oman internal report.

Machado, G., 2013. South Oman Correlation of the Amin Formation. Petroleum Development Oman internal report

Dinis, P., Andersen, T., Machado, G, Guimarães, F. 2012 Detrital zircon U-Pb ages of a late-Variscan Carboniferous succession associated with the Porto-Tomar shear zone (West Portugal): Provenance implications. Sedimentary Geology 273–274:19–29

Machado, G. Dias da Silva, I., Almeida, P. 2012. Palynology, Stratigraphy and Geometry of the Pennsylvanian continental Santa Susana Basin (SW Portugal). Journal of Iberian Geology. 38 (2): 429-448

Machado, G., Francú, E., Vavrdová, M. Flores, D., Fonseca, P.E., Rocha, F., Gama Pereira, L.C., Gomes, A., Chaminé, H.I. 2011. Stratigraphy and Palynology of the Devonian-Mississippian metasedimentary Albergaria-a-Velha Unit (Porto–Tomar shear zone, W Portugal). Geological Quarterly. 55 (2): 139–164

Machado, G., Hladil, J., Koptikova, L., Slavik, L., Moreira, N., Fonseca, P.E., 2010. An Emsian-Eifelian Carbonate-Volcaniclastic Sequence and the possible Record of the basal Choteč event in western Ossa-Morena Zone, Portugal (Odivelas Limestone), Geologica Belgica. 13/4: 431-446.

Machado, G., Hladil, J., Kopitková, L. Fonseca, P., Galle, A., Rocha, F., 2009. The Odivelas Limestones: a middle Devonian reef system in Western Ossa-Morena Zone. Geologica Carpathica. 60 (2): 121-137

Machado, G., Vavrdová, M., Rocha, F.T., Fonseca, P.E., Gama, Chaminé, H.I., 2009. Dating and differentiation of geological units in highly deformed and metamorphosed rocks – Can palynology help? Examples from the Ossa- Morena Zone (W Portugal). Trabajos de Geologia 30: 23-27.

Machado, G., Vavrdová, M., Fonseca, P., Chaminé, H., Rocha, F. T., 2008. Overview of the stratigraphy and initial quantitative biogeographical results from the Devonian of the Albergaria-a-Velha Unit (Ossa-Morena Zone, W Portugal) – Acta Mus. Nat. Pragae, Ser. B, Hist. Nat., Praha. 64 (2-4): 109-113

Machado, G., Hladil, J., Koptikova, L., Fonseca, P.E., Galle, A., Rocha, F.T. 2008. Middle Devonian reef fauna and co-occurring acritarchs from volcanosedimentary sequences within the Beja Igneous Complex (SW Ossa-Morena Zone, Portugal). IGCP 497 & IGCP 499 Final Meeting. Frankfurt. Germany.