Journal of Palaeogeography     2018 7 (3):  1-1    ISSN: 2095-3836  CN: 10-1041/P The hyperpycnite problem G. Shanmugam Department of Earth and Environmental Sciences, The University of Texas at Arlington, Arlington, Texas 76019, USA Received: 2017-09-11  Revised: null  Online: null Supporting info