ICHNOCOENOSIS OF SHORE-SHALLOW LACUSTRINE SHAHEJIE FORMATION (PALEOGENE) IN CHEZHEN SAG, JIYANG DEPRESSION OF BOHAIWAN BASIN, SHANDONG
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Abstract:
This ichnocoenosis from the Paleogene Shahejie Formation consists of at least 10 ichnogenera 11 ichnospecies, namely, Beaconites antarcticus, Beaconites capronus, Planolites montanus, Macaronichnus segregatis, Taenidium barretti, Cochlichnus anguineus, Gordia sp., Skolithos sp., Ophiomorpha nodosa, Sagittichnus sp. and Favreina sp. Besides, a type of unknown arthropod crawling trace is also described in this paper. These trace fossils represent Fodinichnia, Pascichnia, Domichnia and Cubichnia of invertebrates such as Vermes, Mollusca, Arthropoda (mainly insects) and others. Most of them were formed in a regularly desiccated shore-shallow lacustrine environment and preserved in full relief and epirelief.Two ichnofossil assemblages are recognized: (1) Beaconites-Taenidium Assemblage, reflecting a shore-shallow lake sedimentary environment under periodically arid climate; and (2) Skolithos-Ophiomorpha Assemblage, representing a relatively high energy shore lake under humid climate.
