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229 results for “Late Permian”
Fig. 54 in The Changhsingian (Late Permian) ammonoids from Baghuk Mountain (Central Iran)
Fig. 54. Lutites alius Korn & Hairapetian gen. et sp. nov. A. Lateral and dorsal view, holotype specimen MB.C.30013, section E, float. B. Suture line, specimen MB.C.30013, at 64.3 mm dm, 13.5 mm ww, 22.6 mm wh. Abbreviations: see Material and methods. Scale bar units = 1 mm.
Fig. 27 in The Changhsingian (Late Permian) ammonoids from Baghuk Mountain (Central Iran)
Fig. 27. Paratirolites robustus Korn & Hairapetian sp. nov. A. Suture line, holotype MB.C.29778, at 14.2 mm wh. B. Suture line, paratype MB.C.29782, at 13.2 mm wh. C. Whorl profile proportions. Abbreviations: see Material and methods. Scale bar units = 1 mm.
Fig. 17 in The Changhsingian (Late Permian) ammonoids from Baghuk Mountain (Central Iran)
Fig. 17. Shevyrevites shevyrevi Teichert & Kummel in Teichert et al., 1973. A. Lateral and dorsal view, specimen MB.C.29674, section E, float. B. Lateral and dorsal view, specimen MB.C.29672, section B, float. C. Lateral and dorsal view, specimen MB.C.29670, section B, float. D. Suture line, specimen MB.C.29674, at 10.8 mm ww, 13.0 mm wh. E. Whorl profile proportions. Abbreviations: see Material and methods. Scale bar units = 1 mm.
Fig. 16 in The Changhsingian (Late Permian) ammonoids from Baghuk Mountain (Central Iran)
Fig. 16. Pseudogastrioceras relicuum Korn & Ghaderi, 2016, lateral and reconstructed dorsal views of specimen MB.C.29661. Scale bar units = 1 mm.
Fig. 15 in The Changhsingian (Late Permian) ammonoids from Baghuk Mountain (Central Iran)
Fig. 15. Descriptive terms for the whorl profiles and suture lines (exemplified in Paratirolites kittli Stoyanow, 1910) of the paratirolitid ammonoids described here (from Korn et al. 2016).
Fig. 14 in The Changhsingian (Late Permian) ammonoids from Baghuk Mountain (Central Iran)
Fig. 14. Descriptive terms for the conch geometry of the ammonoids described here (from Korn et al. 2016).
Fig. 7 in The Changhsingian (Late Permian) ammonoids from Baghuk Mountain (Central Iran)
Fig. 7. The stratigraphic occurrence of the ammonoid species in the upper part of the Hambast Formation at Baghuk Mountain E section. EH = extinction horizon.
Fig. 10 in The Changhsingian (Late Permian) ammonoids from Baghuk Mountain (Central Iran)
Fig. 10. Correlation of the ammonoid zonations of the Julfa region in NW Iran (after Korn et al. 2016) and Baghuk Mountain with the conodont stratigraphy (after Farshid et al. 2016).
Fig. 13 in The Changhsingian (Late Permian) ammonoids from Baghuk Mountain (Central Iran)
Fig. 13. Cross section of a specimen of Paratirolites sp. from Baghuk Mountain, MB.C.22215; note the different states of preservation of shell walls and septa: a = recrystallized but rather well-preserved shell wall and septa preferably in the mid-dorsal portion of the ammonoid conch; b = dissolved shell wall but sharp demarcation of the ammonoid's internal mould from the sediment at the lower side of the ammonoid conch; c = dissolved shell wall and nearly continuous transition from the ammonoid's internal mould towards the sediment on the upper side of the ammonoid conch (from Leda et al. 2014).
Fig. 12 in The Changhsingian (Late Permian) ammonoids from Baghuk Mountain (Central Iran)
Fig. 12. Mass occurrence of small ammonoids of the genus Arasella Korn in Ghaderi et al., 2014 on the bedding surface at the base of the topmost 5 cm limestone bed, Baghuk Mountain section H. Scale bar units = 10 mm.
Fig. 5 in The Changhsingian (Late Permian) ammonoids from Baghuk Mountain (Central Iran)
Fig. 5. The stratigraphic occurrence of the ammonoid species in the upper part of the Hambast Formation at Baghuk Mountain 1 section. EH = extinction horizon.
Fig. 9 in The Changhsingian (Late Permian) ammonoids from Baghuk Mountain (Central Iran)
Fig. 9. The stratigraphic occurrence of the ammonoid species in the upper part of the Hambast Formation at Baghuk Mountain H section. EH = extinction horizon.
Fig. 4 in The Changhsingian (Late Permian) ammonoids from Baghuk Mountain (Central Iran)
Fig. 4. The upper portion of the Hambast Formation (Paratirolites Limestone equivalent) in Baghuk Mountain 1 section.
Fig. 3 in The Changhsingian (Late Permian) ammonoids from Baghuk Mountain (Central Iran)
Fig. 3. Four selected columnar sections of the upper part of the Hambast Formation (Paratirolites Limestone equivalent) at Baghuk Mountain with their ammonoid zonation.
Fig. 8 in The Changhsingian (Late Permian) ammonoids from Baghuk Mountain (Central Iran)
Fig. 8. The stratigraphic occurrence of the ammonoid species in the upper part of the Hambast Formation at Baghuk Mountain G section. EH = extinction horizon.
Fig. 25 in The Changhsingian (Late Permian) ammonoids from Baghuk Mountain (Central Iran)
Fig. 25 (next page). Paratirolites lanceolobatus Korn & Hairapetian sp. nov. A–E. Lateral and dorsal views. A. Holotype MB.C.29769, section B, float. B. Paratype MB.C.29751, section 1, float. C. Paratype MB.C.29770, section E, -3.30 m. D. Paratype MB.C.29752, section A, float. E–H. Suture lines. E. Holotype MB.C.29769, at 13.5 mm wh. F. Paratype MB.C.29751, at 11.2 mm wh. G. Paratype MB.C.29757, at 11.2 mm wh. H. Paratype MB.C.29770, at 11.1 mm wh. I. Whorl profile proportions. Abbreviations: see Material and methods. Scale bar units = 1 mm.
Data from: Network-based biostratigraphy for the late Permian to mid-Triassic Beaufort Group (Karoo Supergroup) in South Africa enhances biozone applicability and stratigraphic correlation
<p>The Permo-Triassic vertebrate assemblage zones (AZs) of South Africa's Karoo Basin are a standard for local and global correlations. However, temporal, geographical, and methodological limitations challenge the AZs reliability. We analyze a unique fossil dataset comprising 1408 occurrences of 115 species grouped into 19 stratigraphic bin intervals from the <em>Cistecephalus</em>, <em>Daptocephalus</em>, <em>Lystrosaurus</em> <em>declivis</em>, and <em>Cynognathus</em> AZs. Using network science tools we compare six frameworks: Broom, Rubidge, Viglietti, Member, Formation, including a framework suggesting diachroneity of the <em>Daptocephalus</em>/<em>Lystrosaurus</em> AZ boundary (Gastaldo). Our results demonstrate that historical frameworks (Broom, Rubidge) still identify the Karoo AZs. No scheme supports the <em>Cistecephalus</em> AZ, and it likely comprises two discrete communities. The <em>Lystrosaurus</em> <em>declivis</em> AZ is traced across all frameworks, despite many shared species with the underlying <em>Daptocephalus</em> AZ, suggesting the extinction event across this interval is not a statistical artifact. A community shift at the upper Katberg to lower Burgersdorp formations may indicate a depositional hiatus, which has important implications for regional correlations and Mesozoic ecosystem evolution. The Gastaldo model still identifies a <em>Lystrosaurus</em> and <em>Daptocephalus</em> AZ community shift, does not significantly improve recent AZ models (Viglietti), and highlights important issues with some AZ studies. Localized bed-scale lithostratigraphy (sandstone datums), and singleton fossils cannot be used to reject the patterns shown by hundreds of fossils, and regional chronostratigraphic markers of the Karoo foreland basin. Meter-level occurrence data suggest that 20–50 m sampling intervals capture Karoo AZs, unifying the use of meter-level placements of singleton fossils to delineate biozone boundaries and make regional correlations.</p>
Figure 6 in High-resolution stratigraphy of the Changhsingian (Late Permian) successions of NW Iran and the Transcaucasus based on lithological features, conodonts and ammonoids
Figure 6. Characteristic Changhsingian conodonts from the Julfa region (scale bars equal to 100 µm); all specimens stored in the collection of the Ferdowsi University, Mashhad. (A) Clarkina orientalis (Barskov and Koroleva, 1970); FUM#1J192.1; upper Julfa beds (Vedioceras beds), Ali Bashi 1 section. (B) Clarkina subcarinata Sweet, 1973; FUM#4J142.8; Zal Member (Ali Bashi Formation), Ali Bashi 4 section. (C) Clarkina changxingensis Wang and Wang, 1981; FUM#4J153.1; Zal Member (Ali Bashi Formation), Ali Bashi 4 section. (D) Clarkina bachmanni Kozur, 2004; FUM#AJ185.23; Paratirolites Limestone (Ali Bashi Formation), Aras Valley section. (E) Clarkina nodosa Kozur, 2004; FUM#G249.16; Paratirolites Limestone (Ali Bashi Formation), Ali Bashi M section. (F) Clarkina yini Mei, 1998; FUM#AJ192.4; Paratirolites Limestone (Ali Bashi Formation), Aras Valley section. (G) Clarkina abadehensis Kozur, 2004; FUM#1J248.9; Paratirolites Limestone (Ali Bashi Formation), Ali Bashi 1 section. (H) Clarkina hauschkei Kozur, 2004, FUM#1J249D.9; Paratirolites Limestone (Ali Bashi Formation), Ali Bashi 1 section. (I) Hindeodus eurypyge Nicoll, Metcalfe and Wang, 2002, FUM#1J255.7 (cusp broken); Zal Member (Ali Bashi Formation), Ali Bashi 1 section. (J) Hindeodus typicalis Sweet, 1970, FUM#G233.5; Paratirolites Limestone (Ali Bashi Formation), Ali Bashi M section. (K) Hindeodus typicalis Sweet, 1970, FUM#4J200.56; Paratirolites Limestone (Ali Bashi Formation), Ali Bashi 4 section. (L) Hindeodus julfensis Sweet, 1973, FUM#1J198.4; Zal Member (Ali Bashi Formation), Ali Bashi 4 section. (M) Hindeodus praeparvus Kozur, 1996, FUM#G274.6 (cusp broken); Aras Member (Elikah Formation), Ali Bashi M section. (N) Hindeodus changxingensis Wang, 1995, FUM#4J201.6 (cusp broken); Aras Member (Elikah Formation), Ali Bashi 4 section. (O) Merrillina ultima Kozur, 2004, FUM#AJ204.13; Aras Member (Elikah Formation), Aras Valley section. (P) Hindeodus parvus Kozur and Pjatakova, 1976, FUM#4J213.1; Elikah Formation; Ali Bashi 4 section.
Figure 5 in High-resolution stratigraphy of the Changhsingian (Late Permian) successions of NW Iran and the Transcaucasus based on lithological features, conodonts and ammonoids
Figure 5. The correlation of the conodont schemes by Kozur (2005, 2007), Shen and Mei (2010) and own results with the ammonoid stratigraphy by Shevyrev (1965) and own results.
Figure 7 in High-resolution stratigraphy of the Changhsingian (Late Permian) successions of NW Iran and the Transcaucasus based on lithological features, conodonts and ammonoids
Figure 7. Characteristic Changhsingian ammonoids from the Julfa region (scale bars equal to 5 mm); all specimens stored in the collection of the Museum für Naturkunde, Berlin. (A) Phisonites triangulus Shevyrev, 1965 from the Aras Valley section, specimen MB.C.22703; × 1.0. (B) Iranites transcaucasius (Shevyrev, 1965) from the Aras Valley section, specimen MB.C.22704; × 1.0. (C) Dzhulfites nodosus Shevyrev, 1965 from the Aras Valley section, specimen MB.C.22705; × 1.0. (D) Shevyrevites nodosus Shevyrev, 1965 from the Aras Valley section, specimen MB.C.22706; × 1.0. (E) Paratirolites trapezoidalis Shevyrev, 1965 from the Ali Bashi 4 section, specimen MB.C.22707; × 0.75. (F) Stoyanowites dieneri (Stoyanow, 1910) from the Aras Valley section, specimen MB.C.22708; × 1.0. (G) Paratirolites vediensis Shevyrev, 1965 from the Ali Bashi N section, specimen MB.C.22709; × 0.75. (H) Abichites stoyanowi (Kiparisova, 1947) from the Ali Bashi N section, specimen MB.C.22710; × 1.25. (I) Arasella minuta (Zakharov, 1983) from the Ali Bashi N section, specimen MB.C.22711; × 1.25.
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