Rigorous peer-reviews are the basis of high-quality academic publishing. Thanks to the great efforts of our reviewers, Quaternary was able to maintain its standards for the high quality of its published papers. Thanks to the contribution of our reviewers, in 2021, the median time to first decision was 25 days and the median time to publication was 78 days. The editors would like to extend their gratitude and recognition to the following reviewers for their precious time and dedication, regardless of whether the papers they reviewed were finally published:
| Acga Cheng | Lorenzo Rook |
| Achim A. Beylich | Luca Pellegrino |
| Achut Parajuli | Lucyna Wachecka-Kotkowska |
| Adolfo Quesada-Román | Luis Miguel Tanarro |
| Alberto Collareta | Lutz Maul |
| Alexandra Golyeva | Małgorzata (Gosia) Pisarska-Jamroży |
| Alfredo Mayoral | Manuel Abad |
| Ali Tafarojnoruz | Marco Madella |
| Amzad Laskar | Marcos Zedda |
| Anastasia Konstantinovna Markova | Marek Narkiewicz |
| Andrzej Urbaniec | María Cristina FernándezLaso |
| Artyom Gusarov | Maria-Teresa Alberdi |
| Athanassios Athanassiou | Mark Hudson |
| Balázs Bradák | Mark W. Bowen |
| Bas Van Geel | Martin Jones |
| Benjamin Amann | Meng Zhang |
| Biljana Narancic | Meysam Salarijazi |
| Božo Soldo | Mietje Germonpré |
| Camille Daujeard | Miguel Ángel Maté González |
| Carole Nehme | Miłosz Huber |
| Charuta Kulkarni | Miriam Belmaker |
| Christiane Denys | Mohammad Abuzar |
| Christine Hertler | Murat Gül |
| Clive Bonsall | Niccolò Mazzucco |
| Corentin Bochaton | Nicholas E. Bader |
| Cristo Hernández | Nickolay Shcherbakov |
| Daniel Fisher | Nicolas Boulbes |
| Dmitry A. Ganyushkin | Nikos Georgiou |
| Dmitry A. Ruban | Noemí Silva-Sánchez |
| Edson Guilherme | Nuria García García |
| Edwin Cadena | Pál Sümegi |
| Eleonora Carol | Pantelitsa Mylona |
| Elizaveta Kovaleva | Paul Lane |
| Emannuel Desclaux | Pedro Cunha |
| Emiliano Mori | Pedro Piñero |
| Éric G. Fouache | Penny Wilson |
| Etienne Jaillard | Przemyslaw Mroczek |
| Evgeny N. Maschenko | Quentin Goffette |
| Fátima Matos Silva | Raphaël Hanon |
| Ferran Antolín | Raymond L. Bernor |
| Gary Haynes | Revelles López Jordi |
| Gemma Aiello | Richard Waitt |
| George D. Koufos | Robert Sokołowski |
| George Kontakiotis | Roberto Bizzarri |
| Gerald Alexander Islebe | Rodrigo L. Ferreira |
| Giuseppe Corrado | Roman Croitor |
| Gloria Cuenca Bescos | Rosine Cartier |
| Grace Musser | Rowan McLaughlin |
| Gregory Smith | Ruth Blasco |
| H. Greg McDonald | Salvatore Falanga Bolognesi |
| Heike H. Zimmermann | Sara Rassner |
| Huaiming Li | Sevket Sen |
| Hugues Alexandre Blain | Shaun Williams |
| Iia Shuteleva | Simon Holdaway |
| Inmaculada Guerrero Amador | Simon Kaner |
| Isabel Cáceres | Slobodan Miko |
| Iván Martín-Martín | Stanka Šebela |
| James B. Innes | Stoyan Vergiev |
| Jan Dzierżek | Stuart Harris |
| Jean-Pierre Suc | Sudeep Thakuri |
| Jerzy Zasadni | Suzette Flantua |
| Jesús Rodríguez | Tammy Rittenour |
| Johannes Schmidt | Tao Deng |
| Jordi Revelles | Thomas Ingicco |
| Jorge Sanjurjo Sanchez | Toma Shishkov |
| José Baena Preysler | Vera Eisenmann |
| José M. Capriles | Véronique Laroulandie |
| Juan José Ibáñez | Vinicio Manzi |
| Juan Manuel López García | Wenchao Yu |
| Juha Saarinen | Will Fletcher |
| Julien Beck | William C. Johnson |
| Jun Takakura | Xabier Murelaga |
| Kaoru Kashima | Xabier Pontevedra Pombal |
| Karen D. Lupo | Yoichi Usui |
| Katie Adelsberger | Yorgos Facorellis |
| Katrina Kremer | Yury Chendev |
| Laura Panzeri | Z. M. Bochenski |
| Leszek Łęczyński | Zdzisław Jary |
| Lior Weissbrod | Zlatozar Boev |
| Lise Cary | Zoltán Püspöki |
| Loïc Lebreton |
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