... sections of the Lena–Aldan region, but also show additional δ 13 C excursions unrecognized there. The chemostratigraphic correlation suggests that the geological and fossil record of the lower Pestrotsvet Formation in the Selinde section has a deeper history than the stratotype region. This conclusion...

... Ediacaran Yudoma Group, which is unconformably overlain by the lower Cambrian Pestrotsvet Formation ( Fig. 1 ) (see the GSA Data Repository 1 ). The Yudoma Group is subdivided into the Aim (stratigraphic thickness 45–95 m) and Ust′-Yudoma (150–205 m) Formations ( Khomentovsky, 1985 ). Figure 1...

... & Kirschvink (1986) through the Ust’-Yudoma and lower Pestrotsvet formations in the section ‘Dvortsy’, the stratotype of the Tommotian Stage at the Aldan River. The uppermost 10 m of the Ust’-Yudoma Formation has been sampled in detail at the Ulakhan-Sulugur section, a former Precambrian–Cambrian boundary...

... there is an intercalated bed of calcareous glaucon- itie sandstone which has produced some of the fossils characteristic of what is regarded as the first zone of the Cambrian. The Yudoma formation is followed by the red marly limestones of the Pestrotsvet formation, whose thickness i about 7o-9 ° m. In the lowest part...

... ( Cowie & Rozanov, 1983 ), the proposed stratotype boundary point being in the uppermost Ust’-Yudoma Formation, about 1.5 m below the Pestrotsvet Formation ( Rozanov et al. 1969 ; Rozanov et al. 1992 ). A major problem (and probably the decisive one for the eventual rejection of this stratotype...

..., Yakutsk. It was designated asthe Tommotian Stage Stratotype by Rozanov & Missarzhevsky (1966) and is composed of three formations: Yudoma, Pestrotsvet and Tumuldur. The lowermost of these, the Yudoma Formation, was regarded as the top Precambrian formation in pre-1992 stratigraphical schemes. Almost all...

... Formation indicated a correlation of the low-amplitude positive excursion near the base of the unit with excursion II in the lower Pestrotsvet Formation in the Dvortsy section (Aldan River, SE Siberian Platform) and with excursion II in the lower Sukharikha Formation. The overlying prominent excursion...

...-Cambrian Sukharikha River section, northwestern Siberian platform . Geological Magazine 144 , 609 – 18 . Kouchinsky A , Bengtson S , Pavlov V , Runnegar B , Val’kov A and Young E ( 2005 ) Pre-Tommotian age of the lower Pestrotsvet Formation in the Selinde section...

... between the Tolba/Ust’-Yudoma and Pestrotsvet formations. Dark shading indicates intervals of non-deposition or erosion. ...

... containing rather high Cambrian fauna. In some regions (see Figs. 1 and 2 ) they are known from a lower stratigraphic level, much lower than the base of Cambrian [ 15 ]. However, the replacement of the Bilir Formation by red rocks both toward the Aldan Shield (Pestrotsvet Formation) and inward the Patom...

... appearing in the final 14 m. The Ust’-Yudoma Formation ends in a regional unconformity and is overlain by the Pestrotsvet Formation in other Yudoma River sections ( Khomentovsky, 2008 ). Figure 1. Yudoma Group, Kyra-Ytyga River section, Yudoma River, with inset map of Siberian Platform, Russia...

.... Pb–Pb radiometric data (Semikhatov et al . 2003 ) and occurrences of shelly fossil assemblages are extrapolated from the Kyyry-Ytyga section. P – Pestrotsvet Formation. (c) 3D reconstruction of the trace fossil Gaojiashania . S 0 – bedding plane. Scale bar, 10 mm. (d) Interpretation of the trace...

...′ at the Anabar uplift of NW Siberia, only peak I appeared in the Aldan River area of SE Siberia due to a depositional hiatus between the Yudoma Formation and the overlying Pestrotsvet Formation with an apparent karstic surface in between. Consequently, radiation of small shelly fossils of the N . sunnaginicus...

... – 202 . Kouchinsky , A. , Bengtson , S. , Pavlov , V. , Runnegar , B. , Val’kov , A. , and Young , E. , 2005 , Pre-Tommotian age of the lower Pestrotsvet Formation in the Selinde section on the Siberian platform: Carbon isotopic evidence : Geological Magazine , v. 142...