The Archean Earth

The Archean Earth: Tempos and Events, Second Edition is a process-based reference book that focuses on the most important events in early Earth, bringing together experts across Earth Sciences to give a comprehensive overview of the main events of the Archean Eon, as well as of the rates at which important geological and geobiological processes occurred in the same time interval. Over the last two decades, significant progress has been made in our understanding of the processes and events on the early Earth corresponding to advances in the analytical technologies and the continuing efforts of many colleagues that pursue their passion of unravelling the Archean rock record.

The book addresses the origin of the Earth, succeeding impact events, and the evolution of the early Earth, covering topics such as Archean tectonics, volcanism, generation of continental crust, and the ongoing debate about the onset of plate tectonics; the evolution and models for Earth's hydrosphere and atmosphere; the Archean atmosphere and chemical sedimentation; and sedimentation through Archean time; among others. Each topic is well-illustrated and includes a closing commentary at the end of each chapter, leading up to the final chapter which blends the major geological events and rates at which important processes occurred into a synthesis, postulating a number of "event clusters" in the Archean when significant changes occurred in many natural systems and geological environments

Dr. Homann received his MSc in Geology from the University of Potsdam, Germany, in 2010 and his PhD in Geobiology from the Free University of Berlin, Germany, in 2016. After three years of postdoctoral research at the University of Western Brittany in France, he worked as an Assistant Professor in Sedimentology at University College London until the end of 2022. Following a brief appointment as a Visiting Associate at the California Institute of Technology from 2023 to 2024, he became a Research Investigator at the Blue Marble Space Institute of Science in 2025 and currently also works as a Senior Consultant for Amentum Ltd.

His research focuses on the Archean biosphere―specifically, the environments where microbial life thrived billions of years ago and the morphological and geochemical traces it left behind in Earth’s oldest sedimentary archives. He uses a multidisciplinary approach that combines field-generated data with lab-based observations, experiments, and geochemical analysis.

Professor Wladyslaw Altermann is a regional geologist with expertise in Precambrian sedimentary systems, carbonate rocks, early life evolution, and more recently, CO₂ sequestration in South Africa. Originally from Poland, he earned his MSc and PhD (Dr. rer. nat.) at the Free University of Berlin (West), focusing on Permo-Carboniferous rocks of Thailand and Malaysia. He also worked for the German Federal Institute for Geosciences and Natural Resources (BGR) in Hannover and in Peru.

In 1988, Prof. Altermann moved to South Africa, which became his third home. After a postdoctoral fellowship at the University of Stellenbosch, he returned to Germany to join LMU Munich, where he completed his second doctorate (Dr. habil.) in 1998, studying Archean carbonates, stromatolites, BIFs, and the western Kaapvaal Craton's structural geology.

Prof. Altermann held postdoctoral positions at UCLA (USA), CBM–CNRS Orléans (France), and the University of Western Australia (Perth). He later became Associate Professor at LMU Munich, where he served as interim chair for several professorial positions and served as Honorary Professor at Shandong University of Technology (China) from 2003 to 2005. In 2009, he returned permanently to South Africa, joining the University of Pretoria as the Kumba-Exxaro Chair in Geodynamics of Mineral Deposits (mining industry supported Chair) and later becoming Head of the Department of Geology.

Throughout his career, Prof. Altermann has been deeply involved in the scientific community, serving on national committees and editorial boards for international journals and as editor of books and special volumes. He was a Vice-President of the Geological Society of Africa and Chairman of the South African Committee for Stratigraphy. He retired from UP in 2019 and has since been working as a freelance geological consultant in Pretoria.