03014nas a2200301 4500008004100000022001300041245007300054210006900127260001600196300001200212490000700224520218800231653001102419653001302430653002002443653001302463653001102476653001202487653001702499653001702516100002202533700002102555700001602576700002102592700002302613700001902636856005702655 2017 eng d a0567792000aTerreneuvian Stratigraphy and Faunas from the Anabar Uplift, Siberia0 aTerreneuvian Stratigraphy and Faunas from the Anabar Uplift Sibe cMay-31-2017 a311-4400 v623 a

Assemblages of mineralized skeletal fossils are described from limestone rocks of the lower Cambrian Nemakit-Daldyn, Medvezhya, Kugda-Yuryakh, Manykay, and lower Emyaksin formations exposed on the western and eastern flanks of the Anabar Uplift of the northern Siberian Platform. The skeletal fossil assemblages consist mainly of anabaritids, molluscs, and hyoliths, and also contain other taxa such as Blastulospongia, Chancelloria, Fomitchella, Hyolithellus, Platysolenites, Protohertzina, and Tianzhushanella. The first tianzhushanellids from Siberia, including Tianzhushanella tolli sp. nov., are described. The morphological variation of Protohertzina anabarica and Anabarites trisulcatus from their type locality is documented. Prominent longitudinal keels in the anabaritid Selindeochrea tripartita are demonstrated. Among the earliest molluscs from the Nemakit-Daldyn Formation, Purella and Yunnanopleura are interpreted as shelly parts of the same species. Fibrous microstructure of the outer layer and a wrinkled inner layer of mineralised cuticle in the organophosphatic sclerites of Fomitchella are reported. A siliceous composition of the globular fossil Blastulospongia is reported herein and a possible protistan affinity similar to Platysolenites is discussed. New carbon isotope data facilitate correlation both across the Anabar Uplift and with the Terreneuvian Series of the IUGS chronostratigraphical scheme for the Cambrian System. The base of Cambrian Stage 2 is provisionally placed herein within the Fortunian‒Cambrian Stage 2 transitional interval bracketed by the lowest appearance of Watsonella crosbyi and by a slightly higher horizon at the peak of carbon isotope excursion Iʹ from western flank of the Anabar Uplift. Correlation across the Siberian Platform of the fossiliferous Medvezhya and lower Emyaksin formations showing δ13Ccarb excursion Iʹ with the upper Sukharikha Formation containing excursion 5p and upper Ust’-Yudoma Formation containing excursion I is supported herein.

10aAnabar10aCambrian10aCarbon isotopes10aMollusca10aRussia10aSiberia10astratigraphy10aTerreneuvian1 aKouchinsky, Artem1 aBengtson, Stefan1 aLanding, E.1 aSteiner, Michael1 aVendrasco, Michael1 aZiegler, Karen uhttp://www.app.pan.pl/article/item/app002892016.html