AUTHOR=Stinchcomb Gary E. , Beverly Emily J. TITLE=Editorial: The Role of the Paleo-Critical Zone in Shaping Quaternary Hominin Evolution JOURNAL=Frontiers in Earth Science VOLUME=7 YEAR=2019 URL=https://www.frontiersin.org/journals/earth-science/articles/10.3389/feart.2019.00095 DOI=10.3389/feart.2019.00095 ISSN=2296-6463