Excursion Guidebook - Geoloogia Instituut

10 th International Symposium on Fossil Cnidaria and Porifera. Excursion B2: Field Guide9. 0.2 - limestone like bed 7, with some pebbles, discontinuitysurfaces occur.10. 0.3 - homogeneous fine-grained skeletal argillaceouspackstone with abundant Ilionia, discontinuitysurface and marl interbed occur in the middle.11. 0.5 - wavy-bedded to lenticular nodular bioturbatedunsorted skeletal wackestone, higher becomingmore argillaceous.12. 1.0 - lenticular nodular bioturbated argillaceouswackestone alternating with burrowed marlstone,the most argillaceous part in the section, in the upperpart containing lenses of Didymothyris-Limestone.13. 0.2 - fine-grained skeletal grainstone at the baseargillaceous Didymothyris-Limestone with pebblesin the upper part, strongly pyritized discontinuitysurface occurs in the middle.14. 0.7 - resembles bed 12, the middle part is the mostargillaceous, on the upper surface a discontinuitysurface.15. 0.2 - grey limestone, at the base Didymothyris-Limestone, in the upper part purer limestone, asharp discontinuity surface occurs on the upperboundary.16. 0.1 - argillaceous packstone with a discontinuitysurface in the middle.17. 1.9 - like bed 12 with the maximum clay content.18. 0.2 - packstone with pebbles containing two discontinuitysurfaces at the base, fine-grained skeletalgrainstone in the upper part, a strongly pyritizeddouble discontinuity surface on the upperboundary.19. 0.6 - wavy-bedded bioturbated argillaceouswackestone and marl on the top.20. 0.4 - fine-grained skeletal grainstone at the base,distinct discontinuity surface in the middle and unsortedskeletal packstone in the upper part.From the old quarry, situated 1 km northward andcorresponding to beds 5 to 11 in the present quarry,the abundant fauna is recorded: stromatoporoids andtabulate corals see below; brachiopods Didymothyris,Protochonetes, Salopina, Morinorhynchus; molluscsIlionia, Holopea, Murchisonia, fishes Phlebolepis,Thelodus sp.; conodonts Ozarkodina confluens, O.excavata excavata, Oulodus siluricus, etc.Stromatoporoids and tabulate corals are following:stromatoporoids Araneosustroma stelliparratumNestor, 1966,Stromatopora bekkeri, Nestor, 1966,Parallelostroma typicum (Rosen, 1867);tabulate corals Thecia swinderniana (Goldfuss,1829),Favosites kogulaensis Sokolov, 1952,F. forbesi, Milne-Edwards & Haime, 1851,F. psuedoforbesi, Sokolov, 1952,F. subgothlandicus, Sokolov, 1952,Syringopora schmidti Chernyshev, 1937,Parastriatopora coreaniformis (Sokolov, 1952),Thecia confluens (Eichwald, 1854)Stop 18. Katri cliff (Ludlow)Katri cliff is located inthe south-western coastof Saaremaa, 4 kilometerssouth from theKarala village. The sectionis up to 1 meter highwhen the coast is notcovered by eroded limestonepebbles (Fig. 50).The Uduvere beds of thePaadla Stage (Ludlow)are exposed. The largestpart of the section is representedby biostrome. Itincludes abundant faunaof stromatoporoids corals,brachiopods and algae.Fig. 50. Katri cliff. Photo by G. Baranov.51