Peer review is the driving force of journal development, and reviewers are gatekeepers who ensure that Quaternary maintains its standards for the high quality of its published papers. Thanks to the cooperation of our reviewers, in 2020, the median time to first decision was 22 days and the median time to publication was 74 days. The editors would like to express their sincere gratitude to the following reviewers for their precious time and dedication, regardless of whether the papers were finally published:
| Aga, Alemu O. | Jia, Peter |
| Athanassiou, Athanassios | Jordan, P.D. (Peter) |
| Barnes, Gina | Kalnina, Laimdota |
| Belmaker, Miriam | Kaner, Simon |
| Bertè, Davide Federico | King, Edward |
| Beylich, Achim A. | Kinnaird, Tim |
| Biagetti, Stefano | Kluiving, Sjoerd |
| Bird, Douglas W. | Kuitems, Margot |
| Bohle, Martin | Kulkarni, Charuta |
| Bookman, Revital | Kutterolf, Steffen |
| Branch, Nicholas P. | Liritzis, Ioannis |
| Brisset, Elodie | Lu, Zhengyao |
| Brown, A.G. | Luelmo-Lautenschlaeger, Reyes |
| Cartier, Rosine | Maher, Barbara |
| Carvalho, Antonio Faustino | Marciniak, Arkadiusz |
| Carvalho, Filipe | Martínez Cortizas, Antonio |
| Chendev, Yury | Mauquoy, Dmitry |
| CHIRILOAEI, Francisca | McLaughlin, T. Rowan |
| Citter, Carlo | Mead, James Irving |
| Conyers, Lawrence B. | Michelutti, Neal |
| Cowan, Timothy | Miebach, Andrea |
| D’Andrea, Andrea | Mighall, Timothy |
| French, Charles | Moree, Perry |
| Freund, Kyle P. | Morgan, Christopher |
| Gallello, Gianni | Mroczek, Przemyslaw |
| Gearey, Benjamin | Narancic, Biljana |
| Gioia, Dario | Noren, Anders |
| Goswami, Arghya | Paglia, Giorgio |
| Grant, Michael | Pawłowska, Kamilla |
| Grondin, Pierre | Pellegrino, Luca |
| Hamilton, Clive | Penny, Dan |
| Hillman, Aubrey | Rassner, Sara |
| Holdaway, Simon | Régis, Braucher |
| Holekamp, Kay E. | Revelles López, Jordi |
| Hudson, Mark | Ribolini, Adriano |
| Ibáñez Estévez, Juan José | Ricca, Michela |
| Ros-Montoya, Sergio | Tanţău, Ioan |
| Ruban, Dmitry | Townsend, K.E. Beth |
| Ryabchuk, Daria | Treble, Pauline |
| Salminen, Sarianna | Vachula, Richard |
| Schiffer, Christian | Vander Linden, Marc |
| Schmidt, Christoph | Wachecka-Kotkowska, Lucyna |
| Schultze, Martin | Walsh, Kevin |
| Sniderman, Kale | Wandsnider, Luann |
| Springer, Gregory S. | Witkowski, Andrzej |
| Stansell, Nathan D. | Yu, Pei-Lin |
| Stevaux, Jose | Zawiska, Izabela |
| Streletskaya, Irina | Zhang, Jiaxu |
| Sümegi, Pál | Zimmermann, Heike H. |
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