Prof. Peter R. Johnson

6016 SW Haines Street, Portland, Oregon 97219, USA



1958-61: B.Sc Geology, University College, London University

1961-64: Ph.D., Calcutta University, India: Thesis title “The Structure and Stratigraphy of Part of the Upper Pranhita-Godavarai Valley with Special Reference to the Pre-Gondwanas”



1970-73: Exploration Geologist, Rio Tinto Finance and Exploration Ltd, UK

1973-77: Exploration Manager, Rio Tinto Finance and Exploration Ltd, Norway

1977-81: Geologist and Chief Geologist, Riofinex Ltd, Jiddah, Saudi Arabia

1982-90: Consultant, JV Associates Ltd, USA and UK

1990-2000: Technical Advisor, Saudi Arabian Deputy Ministry for Mineral Resources and USGS Saudi Arabian Mission, Jiddah, Saudi Arabia

2000-2007: Technical Advisor: Saudi Geological Survey, Jiddah, Saudi Arabia

2007-present: Geologic Consultant; collaborator with the JEBEL research group (V. Pease, Stockholm University) and Jibalah isotopic and paleomagnetic research group (G. Halverson, McGill University)



Geological Society of America


Current Main Geologic Interests:

Structure, stratigraphy, tectonics, and metallogeny of the Arabian shield, NE Africa, and southern Africa


Consultant Reports:

2009, Review of gold projects and their regional geologic setting, Zimbabwe.

2009, Exploration and geologic investigations in the Precambrian of western Saudi Arabia.

2008, The Precambrian geology of Tanzania, Overview and tectonic framework.


Selected Publications:

2013, Johnson. P.R., An expanding Arabian-Nubian Shield geochronologic and isotopic dataset: defining limits and confirming the tectonic setting of a Neoproterozoic accretionary orogen. Open Geology Journal, in press.

2013, Stern, R.J., Mukherjee, S.K., Miller, N.R., ~750 Ma Banded Iron Formation from the Arabian-Nubian Shield – Implications for understanding Neoproterozoic climate change. Precambrian Research, in press.

2013, Nettle, D., Halverson, G.P., Cox, G.M., Collins, A.S., Schmitz, M., Gehling, J., Johnson, P.R., Kadi, K., Middle-Late Ediacaran Volcano-Sedimentary Record from the Eastern Arabian-Nubian Shield: Terra Nova, in press.

2013, Johnson, P.R., Halverson, G.P., Kusky, T.M., Stern, R.J., Pease, V., Volcanosedimentary basins in the Arabian-Nubian shield: markers of repeated exhumation and denudation in a Neoproterozoic accretionary orogen: Geosciences Open Access, v. 3, p. 389-445.

2013, Johnson, P.R., and Kattan, F.H., The Geology of the Arabian Shield in Saudi Arabia: Saudi Geological Survey, 503 p.

2013, Fritz, H., Adbelsalam, M., Ali, K.A., Collins, A.S., Fowler, A.R., Ghebreab, W., Hauzenberger, C.A., Johnson, P.R., Kusky, T.M., Macey, P., Muhongo, S., Stern, R.J., Viola, G., Orogen styles in the East African Orogen: a review of the Neoproterozoic to Cambrian tectonic evolution: Journal of African Earth Sciences, v. 86, p. 65-106.  

2011, Johnson, P.R., Andresen, A., and others, Late Cryogenian-Ediacaran history of the Arabian-Nubian Shield: A review of depositional, plutonic, structural and tectonics events in the closing stages of the northern East African Orogen: Journal of African Earth Sciences, v. 61, p. 167-232.

2011, Stern, R.J., Johnson, P.R., Ali, K.A., and Mukherjee, S.K., Evidence for Early and mid-Cryogenian glaciation in the northern Arabian-Nubian Shield (Egypt, Sudan, and western Arabia), in Arnaud, E., Halverson, G. P. & Shields-Zhou, G. (eds) The Geological Record of Neoproterozoic Glaciations. Geological Society, London, Memoirs, 36, p. 277–284.

Stern, R.J., Johnson, P.R., Continental lithosphere of the Arabian Plate: A geologic, petrologic, and geophysical synthesis:Earth-Science Reviews, v. 101, p. 29–67.

2010, Stern, R.J., Ali, K.A., Liégeois, J.P., Johnson, P.R., Kozdroj, W., and Kattan, F.H., Distribution and significance of pre-Neoproterozoic zircons in juvenile Neoproterozoic igneous rocks of the Arabian-Nubian Shield: American Journal of Science, v. 310, p. 791-811.

2008, Johnson, P.R., and Kattan, F.H., Lithostratigraphic revision in the Arabian Shield: the impacts of geochronology and tectonic analysis: Arabian Journal for Science and Engineering, v. 33, p. 3-16.

2007, Johnson, P.R., and Kattan, F.H., Geochronologic dataset for Precambrian rocks in the Arabian Peninsula, a catalogue of U-Pb, Rb-Sr, Ar-Ar, and Sm-Nd ages: Saudi Geological Survey Open-File Report SGS-OF-2007-3, 21 p.

2006, Johnson, P.R., Geologic map of the Arabian shield, Kingdom of Saudi Arabia, 1:500,000 scale: Saudi Geological Survey Technical Report SGS-TR-2005-4, in seven sheets, 1:500,000 scale.

2006, Johnson, P.R., Explanatory notes to the map of Proterozoic geology of western Saudi Arabia: Saudi Arabian Geological Survey Technical Report SGS-TR-2006-4, 62 p.

2005, Johnson, P.R., Proterozoic geology of western Saudi Arabia: Saudi Geological Survey Open-File Reports SGS-OF-2005-6, SGS-OF-2005-4, SGS-OF-2005-2, SGS-OF-2005-5, SGS-OF-2004-9, 48 p.

2004, Stern, R.J., Johnson, P.R., Kröner, A., and Yibas, B., Neoproterozoic ophiolites in the Arabian-Nubian shieldin Kusky, T.M., (ed.) Precambrian Ophiolites and related Rocks, Elsevier, Developments in Precambrian Geology, v. 13, p. 95-128  and

2004, Johnson, P.R., Kattan, F.H., and Al-Saleh, A.M., Neoproterozoic ophiolites in the Arabian shield: field relationships and structures, in Kusky, T.M., (ed.) Precambrian Ophiolites and related Rocks, Elsevier, Developments in Precambrian Geology, v. 13, p. 129-162.

2003, Johnson, P.R., Stern, R.J., and Abdelsalam, M., The Bi’r Umq-Nakasib suture zone in the Arabian-Nubian shield: A key to understanding crustal growth in the East African Orogen: Gondwana Research, v. 6, p. 523-530.

2003, Johnson, P.R., Post-amalgamation basins of the NE Arabian shield and implications for Ediacaran tectonism in the northern East African Orogen: Precambrian Research, v. 123, p. 321-337.

2003, Johnson, P.R., and Woldehaimanot, B., Development of the Arabian-Nubian shield: perspectives on accretion and deformation in the northern East African Orogen and the assembly of Gondwana, in Yoshida, M., Windley, B.F., and Dasgupta, S. (eds) Proterozoic East Gondwana: Supercontinent Assembly and Breakup, Geological Society of London Special Publication 206, p. 289-325.

2002, Johnson, P.R., Abdelsalam, M., and Stern, R.J., The Bi’r Umq-Nakasib shear zone: Geology and structure of a Neoproterozoic suture in the northern East African orogen, Saudi Arabia and Sudan: Saudi Geological Survey Technical Report SGS-TR-2002-1, 33 p.

2001, Johnson, P.R., Implications of SHRIMP and microstructural data on the age and kinematics of shearing in the Asir terrane, southern Arabian shield, Saudi Arabia: Gondwana Research, v. 4, p. 172-173.

2001, Johnson, P.R., and Kattan, F.H., Oblique sinistral transpression in the Arabian shield: the timing and kinematics of a Neoproterozoic suture zone: Precambrian Research, v. 107, p. 117-138.