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Hong, Jongsun,Choh, Suk-Joo,Park, Jino,Lee, Dong-Jin Elsevier 2017 Palaeogeography, palaeoclimatology, palaeoecology Vol.470 No.-
<P><B>Abstract</B></P> <P>The Great Ordovician Biodiversification Event (GOBE) involved a remarkable rise of skeletal reefs during the late Middle Ordovician. A new type of skeletal patch reef built by labechiid stromatoporoids is reported from the Yeongheung Formation (Darriwilian) of the Korean Peninsula, part of the eastern North China Block, a hot-spot for late Middle Ordovician diversification of early labechiids. The attachment of laminar labechiids, subordinate peloidal micritic crusts and spiculate sponges, and minor bryozoans on peloidal–intraclastic packstone to grainstone substrates, and upward growth of these organisms by repeated encrustation, resulted in the construction of centimeter-scale domal tight frame structures. These skeletal frames were in turn veneered by larger labechiids, forming sub-meter-scale laminar skeletal reefs with primary cavities. Such skeletal reefs that formed by the encrustation and binding of labechiid stromatoporoids are analogous to the bindstone frameworks of coeval Laurentian reef mounds and skeletal reefs, though they differ markedly in composition, as is apparent in the absence of tabulate corals and markedly lower contribution of bryozoans, both of which were key elements of the Chazy reefs of Laurentia. The Yeongheung reefs described herein represent some of the oldest labechiid skeletal reefs known to date, and formed mainly by the aggregation of early stromatoporoids prior to the arrival of corals and other robust constructors in the region. This discovery provides new information on the evolutionary trends of early skeletal reefs in response to the appearance of new reef-building organisms and their regional distributions during the Ordovician radiation.</P> <P><B>Highlights</B></P> <P> <UL> <LI> One of the oldest Middle Ordovician stromatoporoid skeletal reefs is reported from Korea. </LI> <LI> The reef is primarily built by laminar labechiid stromatoporoid, which differs from coeval Chazy skeletal reefs composed of bryozoan-coral-stromatoporoid. </LI> <LI> Such disparity might represent regionally variable trend of skeletal reef evolution during GOBE. </LI> </UL> </P>
Hong, Jongsun,Oh, Jae-Ryong,Lee, Jeong-Hyun,Choh, Suk-Joo,Lee, Dong-Jin Elsevier 2018 Palaeogeography, palaeoclimatology, palaeoecology Vol.492 No.-
<P><B>Abstract</B></P> <P>Sub-metre-scale patch reefs composed primarily of stromatoporoids and bryozoans are reported from the Duwibong Formation (upper Middle Ordovician), Taebaeksan Basin, Korea, in the eastern margin of the Sino-Korean Block. The reef framework is constructed of alternating thin laminae of the primitive labechiid stromatoporoid <I>Cystostroma</I>, the bryozoan <I>Nicholsonella</I>, subordinate <I>Solenopora</I> and minor siliceous sponges. Alternating laminae of stromatoporoids and bryozoans are largely responsible for the formation of a globular framework composed of columnar, branching, bulbous to irregular masses. <I>Solenopora</I> sporadically occurring as tiny patches or thin laminae attached to the stromatoporoid–bryozoan framework is considered to be subordinate encrusters. Siliceous sponges occur within the stromatoporoid–bryozoan framework and within the growth framework and bored cavities, interpreted as subordinate encrusters and cryptic dwellers. The compact globular framework of the Duwibong stromatoporoid–bryozoan consortium represents a new type of Ordovician skeletal bioconstruction, but with a certain structural similarity to Lower Ordovician bryozoan reefs in the South China Block. Together with coeval labechiid reefs occurring near the current study area, the Duwibong reefs suggest that incursion of the primitive stromatoporoids into the earliest bryozoan reefs resulted in the dominance of reef-building stromatoporoids in peri-Gondwana in contrast to coeval reefs in Laurentia, which commonly contain tabulate corals.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The oldest stromatoporoid–bryozoan reefs are documented from Middle Ordovician of Korea. </LI> <LI> The reefs resemble the earliest bryozoan reefs in structure and shape. </LI> <LI> The reefs differ in biologic makeup from coeval Laurentian examples. </LI> <LI> The pathway of earliest skeletal reef evolution may have been different among regions. </LI> </UL> </P>