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Fig. 1 in Benthic ostracods from the Early-Middle Frasnian transition in the north-western East European Platform, Russia
Fig. 1. Overview map of the region: I, Luga and Ladoga monoclines; II, Latvian Uplift; III, Moscow Syneclise; IV, Voronezh Anteclise; 1, Early Frasnian section in the Syas' River; 2, Early Frasnian section in the vicinity of the town Stary Izborsk; 3, Early–Middle Frasnian section in the town of Porkhov; 4, Early–Middle Frasnian section in the town of Soltsy; 5–7, Early– Middle Frasnian boreholes in the Lake Il'men area; 8, Middle Frasnian section in the town of Semiluki; 9, Early–Middle Frasnian Il'men borehole.
Fig. 8 in Early-Middle Frasnian cyrtospiriferid brachiopods from the East European Platform
Fig. 8. Cyrtospirifer mylaensis sp. nov., Middle Frasnian, Kraipol Formation, Middle Timan. A. Holotype, CNIGR 8/13157, ventral (A1), dorsal (A2), posterior (A3), anterior (A4), and lateral (A5) views. B. CNIGR 9/13157, ventral (B1), dorsal (B2), posterior (B3), anterior (B4), and lateral (B5) views.
Fig. 5 in Early-Middle Frasnian cyrtospiriferid brachiopods from the East European Platform
Fig. 5. Cyrtospiriferids from Middle Frasnian of the Main and Central Devonian Fields. A, B. Cyrtospirifer schelonicus (Nalivkin, 1941), Svinord Beds, Main Devonian Field. A. CNIGR 2/13157, ventral (A1), dorsal (A2), posterior (A3), anterior (A4), and lateral (A5) views. B. CNIGR 3/13157, ventral (B1), dorsal (B2), posterior (B3), anterior (B4), and lateral (B5) views. C, D. Cyrtospirifer rudkinensis Ljaschenko, 1959, Semiluki Horizon, Central Devonian Field. C. CNIGR 4/13157 ventral (C1), dorsal (C2), posterior (C3), anterior (C4), and lateral (C5) views. D. CNIGR 5/13157 ventral (D1), dorsal (D2), posterior (D3), anterior (D4), and lateral (D5) views.
Fig. 3. Early Frasnian cyrtospiriferd Uchtospirifer nalivkini Ljaschenko, 1957 from the Kyn Horizon, Urals. A. CNIGR 287 in Early-Middle Frasnian cyrtospiriferid brachiopods from the East European Platform
Fig. 3. Early Frasnian cyrtospiriferd Uchtospirifer nalivkini Ljaschenko, 1957 from the Kyn Horizon, Urals. A. CNIGR 287, ventral (A1), dorsal (A2), anterior (A3), and lateral (A4) views. B. CNIGR 286, ventral (B1), dorsal (B2), anterior (B3), and lateral (B4) views. C. CNIGR 289, ventral (C1), dorsal (C2), anterior (C3), and lateral (C4) views. D. CNIGR 290, ventral (D1), dorsal (D2), anterior (D3), and lateral (D4) views; shell surface showing microornament (D5).
Fig. 4 in Early-Middle Frasnian cyrtospiriferid brachiopods from the East European Platform
Fig. 4. Transverse serial sections of complete shell of Uchtospirifer nalivkini Ljaschenko, 1957, Early Frasnian, Kyn Horizon, Urals. Numbers refer to distances in mm from the top of the ventral umbo, CNIGR 1/13157.
Fig. 7 in Early-Middle Frasnian cyrtospiriferid brachiopods from the East European Platform
Fig. 7. Transverse serial sections of complete shell of Cyrtospirifer rudkinensis (Ljaschenko, 1959), Middle Frasnian, Semiluki Horizon, Central Devonian Field. CNIGR 7/13157. Distance in mm is measured from the posterior tip of ventral beak.
Fig. 7 in Faunal and facies changes at the Early-Middle Frasnian boundary in the north-western East European Platform
Fig. 7. Correlation of the conodont intervals of the Main Devonian Field and conodont zones of the Central Devonian Field, to show examples of northward migrations.
Fig. 2 in Early-Middle Frasnian cyrtospiriferid brachiopods from the East European Platform
Fig. 2. Distribution of Cyrtospiriferidae in the Frasnian of the East European Platform (EEP). The standard conodont zonation after Klapper and Ziegler (1979), Ziegler and Sandberg (1990), and polygnathid zonation for Frasnian of the EEP proposed by Ziegler et al. (2000). Abbreviations: C., Cyrtospirifer; M., Mesotaxis; Pa., Palmatolepis; Po., Polygnathus; U., Uchtospirifer.
Fig. 1. A in Early-Middle Frasnian cyrtospiriferid brachiopods from the East European Platform
Fig. 1. A map showing the position of Frasnian brachiopod localities containing cyrtospiriferids of the East European Platform. Abbreviations: 1, Il'men Lake; 2, Schelon river; 3, Koloschka river; 4, Psizha river; 5, Rudkino village; 6, Kyn village; 7, Myla river; 8, Tsylma river; 9, Pizhma Pechorskaya river.
Fig. 6 in Faunal and facies changes at the Early-Middle Frasnian boundary in the north-western East European Platform
Fig. 6. Faunal intervals and guide species for the Early–Middle Frasnian in the Main Devonian Field, and correlation of the regional and local Frasnian subdivisions of the MDF with global scale and standard conodont zonation.
Fig. 5 in Faunal and facies changes at the Early-Middle Frasnian boundary in the north-western East European Platform
Fig. 5. Carbon isotopic composition (δ13C), fauna diversity dynamics, and sea level changes in the Main Devonian Field in the Early–Middle Frasnian interval (see Fig. 3).
Fig. 4 in Faunal and facies changes at the Early-Middle Frasnian boundary in the north-western East European Platform
Fig. 4. Comparison of the global sea−level curve and regional sea−level fluctuations in the Early–Middle Frasnian interval of the Main Devonian Field (see Fig. 3).
Fig. 3 in Faunal and facies changes at the Early-Middle Frasnian boundary in the north-western East European Platform
Fig. 3. Facies and sea level changes across the Early–Middle Frasnian transition in boreholes located in the Il'men Lake area (see Fig. 1).
Fig. 12 in Early-Middle Frasnian cyrtospiriferid brachiopods from the East European Platform
Fig. 12. Transverse serial sections of complete shells of Cyrtospirifer tenticulum (Verneuil, 1845), Middle Frasnian, Buregi Beds, Main Devonian Field. A. CNIGR 13/13157. B. CNIGR 14/13157. C. CNIGR 15/13157. Distance in mm is measured from the posterior tip of ventral beak.
Fig. 11 in Early-Middle Frasnian cyrtospiriferid brachiopods from the East European Platform
Fig. 11. Transverse serial sections of complete shell of Cyrtospirifer tenticulum (Verneuil, 1845), Middle Frasnian, Buregi Beds, Main Devonian Field. CNIGR 12/13157. Distance in mm is measured from the posterior tip of ventral beak.
Fig. 1. A in Faunal and facies changes at the Early-Middle Frasnian boundary in the north-western East European Platform
Fig. 1. A. Overview map of the studied Frasnian localities in the St. Petersburg region: 1, Stary Izborsk vicinity; 2, Porkhov town; 3, Il'men Lake area. B. Details of the borehole location in the Il'men Lake area (see Fig. 3).
Fig. 9 in Early-Middle Frasnian cyrtospiriferid brachiopods from the East European Platform
Fig. 9. Transverse serial sections of complete shell of Cyrtospirifer mylaensis sp. nov., from Middle Frasnian, Kraipol Formation, Middle Timan. CNIGR 10/13157. Distance in mm is measured from the posterior tip of ventral beak.
Fig. 3 in Benthic ostracods from the Early-Middle Frasnian transition in the north-western East European Platform, Russia
Fig. 3. Stratigraphical distribution of ostracods in the Izborsk Quarry, Soltsy, and Porkhov sections (partly after Ivanov et al. 2005 with additions).
Fig. 10. A in Benthic ostracods from the Early-Middle Frasnian transition in the north-western East European Platform, Russia
Fig. 10. A. Uchtovia elongata Glebovskaja and Zaspelova in Egorov, 1950. Tecnomorph carapace PIN 5128/52 in left lateral view; MDF, borehole No 5, sample i5/207; Palmatolepis punctata Zone. B. Uchtovia aff. elongata Glebovskaja and Zaspelova in Egorov, 1950. Tecnomorph carapace PIN 5128/53 in left lateral view; CDF−9/9, Semiluki Horizon, Pa. punctata Zone. C. Sulcella (Postsulcella) sp. A. Female carapace PIN 5128/54 in left lateral view; CDF−9/9, Semiluki Horizon, Pa. punctata Zone. D. Sulcella (Postsulcella) sp. B. Female carapace PIN 5128/55 in left lateral view; CDF−9/9, Semiluki Horizon, Pa. punctata Zone. E. Timanella sp. A. Tecnomorph carapace PIN 5128/56 in left lateral view; CDF, Il'men borehole, sample 68; Semiluki Horizon, Pa. punctata Zone. F. Timanella sp. B. Tecnomorph carapace PIN 5128/57 in left lateral view; MDF, Koloshka River; Svinord Beds, Pa. punctata Zone. G. Cavellina cf. chvorostanensis Polenova, 1953. Female carapace PIN 5128/58 in right lateral view; MDF, Pskov Beds, Pa. transitans Zone. H, I. Cavellina batalinae Zaspelova, 1959. Female carapaces PIN 5128/59 and PIN 5128/60 in right lateral views; MDF, Syas' River, sample S−3/1; Pskov Beds, Pa. transitans Zone. J. Acratia cf. pskovensis Egorov, 1953. Carapace PIN 5128/61 in right lateral view; MDF, Izborsk section, sample 5158/O2; Chudovo Beds, Pa. transitans Zone. K. Acratia cf. tschudovoensis Zaspelova, 1959. Carapace PIN 5128/62 in right lateral view; MDF, Izborsk section, sample 5158/O2; Chudovo Beds, Pa. transitans Zone. L. Acratia cf. longa Zaspelova in Polenova, 1955. Carapace PIN 5128/63 in right lateral view; MDF, Syas' River, sample S−3/1; Pskov Beds, Pa. transitans Zone. M. Acratia cf. schelonica Egorov, 1950. Carapace PIN 5128/64 in right latero−ventral view; CDF, Il'men borehole, sample 48; Semiluki Horizon, Pa. punctata Zone. N. Bairdia aff. symmetrica Egorov, 1953. Carapace PIN 5128/65 in right lateral view. CDF, Il'men borehole, sample 53; Semiluki Horizon, Pa. punctata Zone. O. Heladianella cf. svinordensis Glebovskaja and Zaspelova, 1959. Carapace PIN 5128/66 in right lateral view; MDF, Koloshka River; Svinord Beds, Pa. punctata Zone. Scale bars 0.1 mm.
Fig. 7. A in Benthic ostracods from the Early-Middle Frasnian transition in the north-western East European Platform, Russia
Fig. 7. A. Paraparchites calculus (Glebovskaja and Zaspelova in Zaspelova, 1959). Tecnomorph right valve PIN 5128/1; MDF, Porkhov section, sample 6/4; Porkhov Beds, Palmatolepis punctata Zone. B. Palaeocopina gen. et sp. indet. Carapace PIN 5128/2 in left lateral view; MDF, Izborsk Quarry section, sample 5/3; Dubnik Beds, Pa. transitans Zone. C. Gravia? sp. nov. aff. schallreuteri Becker, 1970. Carapace PIN 5128/3 in left lateral view; CDF−9/9; Semiluki Horizon, Pa. punctata Zone. D. Buregia sp. Carapace PIN 5128/4 in left lateral view; CDF, Il'men borehole, sample 830; Semiluki Horizon, Pa. punctata Zone. E. Buregia aff. depressa Polenova, 1953. Carapace PIN 5128/5 in left lateral view; MDF, Izborsk Quarry section, sample 5158−O2; Chudovo Beds, Pa. transitans Zone. F. Buregia sp. nov. Carapace PIN 5128/6 in left lateral view; CDF, Il'men borehole, sample 849; Semiluki Horizon, Pa. punctata Zone. G. Subtella cf. deca Zaspelova 1952. Left valve PIN 5128/7; MDF, borehole No 5, sample i5/207; Pa. punctata Zone. H. Pseudonodella cf. nodosa Zaspelova 1952. Right valve PIN 5128/8; MDF, Izborsk Quarry section, sample 5/4; Dubnik Beds, Early Frasnian. I. Nodella aff. tichonovichi Zaspelova, 1952. Male? left valve PIN 5128/9; MDF, borehole No 6, sample 6/44; Porkhov Beds, Pa. punctata Zone. J–L. Nodella aff. dobroljubovi Schishkinskaja, 1968. J. Right female valve PIN 5128/10; CDF, Il'men borehole, sample 58; Sargaevo Horizon, Pa. transitans Zone. K. Male right valve PIN 5128/11; MDF, Izborsk Quarry section, sample 5/1; Dubnik Beds, Pa. transitans Zone. L. Female left valve PIN 5128/12; MDF, Izborsk Quarry section, sample 5/1; Dubnik Beds, Pa. transitans Zone. M–O. Nodella conotuberculata Zaspelova, 1952. M. Female left valve PIN 5128/13. N. Male left valve PIN 5128/14. O. Male right valve PIN 5128/15. MDF, Porkhov section, sample 5157/2; Porkhov Beds, Pa. punctata Zone. Scale bars 0.1 mm, except B for which is 0.2 mm.
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Allen Brain Atlas
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