. Bulletin of the Natural Histort Museum. Geology series. 16 POPOV, COCKS AND NIKITIN Devonian 1. Anderkenyn-Akchoku section (west) l-»- 2. Kujandysai section 4. Buidukbai-Akchoku Mountain. 8. Kotnak mountains SWof Karpkuduk Devonian 7. South side of Karatal river south of Sorbulak spring 300 6. Burultas valley ,oo F-1041a «â 818a 50 2 F-1024b , F-1024 Ect. A. .-F-1018 e-F-1018a Conglomerate and sandstone, intercalating Intercalating sandstone and siltstone with coquina storm beds Limestone and siltstone intercalating Sandstone, bedded. Sandstone,
. Bulletin of the Natural Histort Museum. Geology series. 16 POPOV, COCKS AND NIKITIN Devonian 1. Anderkenyn-Akchoku section (west) l-»- 2. Kujandysai section 4. Buidukbai-Akchoku Mountain. 8. Kotnak mountains SWof Karpkuduk Devonian 7. South side of Karatal river south of Sorbulak spring 300 6. Burultas valley ,oo F-1041a «â 818a 50 2 F-1024b , F-1024 Ect. A. .-F-1018 e-F-1018a Conglomerate and sandstone, intercalating Intercalating sandstone and siltstone with coquina storm beds Limestone and siltstone intercalating Sandstone, bedded. Sandstone, cross-bedded Sandstone 7*TT71 Conglomerate, pebbly, polymict Beke Formation Sandstone, siltstone and mudstone, graded MIDDLE ORDOVICIAN Uzunbulak Formation Siltstone and mudstone Fig. 3 Columnar sections through the Anderken Formation showing informal units, stratigraphic positions of samples and brachiopod associations: Ect. Ectenoglossa Association, T. A., Tesikella Association, Mabella-Sowerbyella Association. A., Acculina-Dulankaretla Association, A., Parastrophina-Kellerella Association, A., Zhilgyzambonites-Foliomena Association, A, Gastropod-Bivalved Molluscs Association. The numbers of the sections are the same as those on Fig. 1. Unit 3. Coarse- to medium- grained sandstone with mostly subhorizontal stratification, about 40-62 m thick in the Anderkenyn- Akchoku section and up to 97 m thick in the Kujandysai section, with some storm beds of coquinas up to 20 cm thick with concentrations of gastropods and the disarticulated bivalved molluscs Edmondia fecunda Khalfin, Ctenodonta sp. and Orthonota'l sp. (Sample 8130a). Gastropods, bivalved molluscs and the trilobite Eokosovopeltis romanovskyi become increasingly abundant in the flank deposits in the upper 20 m of the unit (Samples 8130, 8134). In the Kujandysai section concentrations of bivalved molluscs occur in the middle part in association with the rare brachiopod Tesikella ne
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