“…In the Taebaek area of Korea (Taebaeksan Basin), an ~1200-m-thick mixed carbonatesiliciclastic sequence was deposited from the Cambrian Series 2 to the Middle Ordovician (Kwon et al, 2006). The Cambrian-Ordovician boundary lies in the basal part of the Dongjeom Formation, which conformably overlies the Hwajeol Formation (Choi et al, 2016). Evidence of a time gap or sedimentary hiatus across the Cambrian-Ordovician boundary is not recognized in this area, which can be noted from detailed sedimentological and paleontological studies performed in the area over the past 30 yr (e.g., Woo and Park, 1989;Choi et al, 2003Choi et al, , 2016Choi and Chough, 2005;Kwon et al, 2006;Choi, 2007, 2011).…”