Ordovician stratigraphy of the Stumsnäs 1 drill core from the southern part of the Siljan Ring, central Sweden

Ordovician sediments sandwiched between Proterozoic basement slivers: tectonic structures in the Stumsnäs 1 drill core from the Siljan Ring, central Sweden

“…Repetition of units and inverted stratigraphy occur especially in the upper half of the sequence (Fig. 2 in Lehnert et al, 2013). For example, in an inverted section between , 216 and 206 m, the Slandrom Limestone lies on top of the highly disturbed Fjäcka Shale and lower Jonstorp Formation (Fig.…”

“…This is overlain by slices of sheared 1.07-m-thick greenish pinkish grey limestone (unit 52) and 67-cm-thick grey limestone (unit 53), followed by a 13-cm-thick granite breccia (unit 54) and 19-cm-thick fractured and partially pulverised grey limestone (unit 55). On top, a 48-cm-thick fault breccia (unit 56) with large The unit numbers in white refer to the sedimentary units defined in the core section (see Lehnert et al, 2013). A colour version of this figure is available in the online version.…”

“…5). A detailed description of the stratigraphy and the fault-bound units of the sedimentary succession is given in Lehnert et al (2013). We therefore focus here on structural features to prevent repetition.…”

“…This paper documents the initial observations on the structures in the Stumsnäs 1 core. A detailed description of the Ordovician stratigraphy of the core is given by Lehnert et al (2013). The results provide new insights into the local structure of the crater in the southern part of the Siljan Ring in central Sweden.…”

Analysis of borehole geophysical data from the Mora area of the Siljan Ring impact structure, central Sweden

“…1) the Lower Ordovician successions are cut by faults . What appear to be large slabs of granitic basement also overlie the sedimentary strata in the east Lehnert et al, 2013). However, in the eastern part of the Siljan Ring, even when partly tectonised, some complete Ordovician carbonate sections overlain by Silurian siliciclastics are recorded .…”