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109 results for “Middle Permian”
Data from: Middle Permian fusulines from the Thitsipin Formation of Shan State, Myanmar and their palaeobiogeographical and palaeogeographical implications
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FIGURE 24. A–B in Middle Permian (Roadian) gastropods from the Khao Khad Formation, Central Thailand: Implications for palaeogeography of the Indochina Terrane
FIGURE 24. A–B, Palaeostylus sp., ESKU-19-LP 7. C–D, Pseudozygopleura? sp., ESKU-19-LP 63. Scale bars represent: 1 mm (A–B); 2 mm (C–D).
FIGURE 23 in Middle Permian (Roadian) gastropods from the Khao Khad Formation, Central Thailand: Implications for palaeogeography of the Indochina Terrane
FIGURE 23. Platyzona gradata sp. nov., A–F, ESKU-19-LP 11, holotype. Scale bars represent: 2 mm (A–B, E–F); 1 mm (C–D).
FIGURE 26. A–C in Middle Permian (Roadian) gastropods from the Khao Khad Formation, Central Thailand: Implications for palaeogeography of the Indochina Terrane
FIGURE 26. A–C, Genus and Species indeterminate 1, ESKU-19-LP 4. D, Genus and Species indeterminate 2, ESKU-19-LP 207. Scale bars represent: 2 mm (A–C); 200 μm (D).
FIGURE 22. A–C in Middle Permian (Roadian) gastropods from the Khao Khad Formation, Central Thailand: Implications for palaeogeography of the Indochina Terrane
FIGURE 22. A–C, Strobeus? sp. 1, A–B, ESKU-19-LP 49. C, ESKU-19-LP 90. D–E, Strobeus? sp. 2, D, ESKU-19-LP 217. E, ESKU-19-LP 220. F, Girtyspira? sp., ESKU-19-LP 222. G, Heterosubulites longusapertura sp. nov. ESKU-19-LP 215, holotype. Scale bars represent: 2 mm (A–C); 200 μm (D–G).
FIGURE 18. A–J in Middle Permian (Roadian) gastropods from the Khao Khad Formation, Central Thailand: Implications for palaeogeography of the Indochina Terrane
FIGURE 18. A–J, Yunnania inflata sp. nov. A–B, ESKU-19-LP 9, holotype; C–G, ESKU-19-LP 65, paratype. H–J, juvenile specimens, H–I, ESKU-19-LP 205. J, ESKU-19-LP 215. K, Araeonema cf. tenuistriata (Netchaev, 1894), ESKU-19-LP 99. All scale bars represent 1 mm.
FIGURE 19 A–C in Middle Permian (Roadian) gastropods from the Khao Khad Formation, Central Thailand: Implications for palaeogeography of the Indochina Terrane
FIGURE 19 A–C, Microdoma conicum Meek & Worthen, 1867, ESKU-19-LP 69. All scale bars represent 1 mm.
FIGURE 15 in Middle Permian (Roadian) gastropods from the Khao Khad Formation, Central Thailand: Implications for palaeogeography of the Indochina Terrane
FIGURE 15. Altotomaria reticulata sp. nov. A–E, ESKU-19-LP 83, holotype. All scale bars represent 1 mm.
FIGURE 25. A in Middle Permian (Roadian) gastropods from the Khao Khad Formation, Central Thailand: Implications for palaeogeography of the Indochina Terrane
FIGURE 25. A, Donaldospira sp., ESKU-19-LP 85. B–E, Knightella irregularis (Longstaff, 1933), B–C, ESKU-19-LP 41. D–E, ESKU-19-LP 84. F–H, Protostylus sp., F, ESKU-19-LP 39. G–H, ESKU-19-LP 64. I–N, Trypanocochlea lopburiensis sp. nov. I, M, ESKU-19-LP 210, holotype; oblique view of early whorls to show protoconch. J, ESKU-19-LP 201, paratype. K, ESKU-19-LP 203, paratype. L, ESKU-19-LP 206, paratype; lateral view of early whorls to show protoconch. N, ESKU-19-LP 221, paratype. O–R, Streptacis? khaokhadensis sp. nov., O–P, ESKU-19-LP 214, holotype. Q–R, ESKU-19-LP 213, paratype. Scale bars represent: 2 mm (A–H); 200 μm (I–R).
FIGURE 21. A–D in Middle Permian (Roadian) gastropods from the Khao Khad Formation, Central Thailand: Implications for palaeogeography of the Indochina Terrane
FIGURE 21. A–D, Trachydomia suwanneeae sp. nov., ESKU-19-LP 26, holotype. E–F, Trachydomia cf. nodusum (Meek & Worthen, 1866), ESKU-19-LP 92. G–K, Trachyspira eleganta sp. nov., ESKU-19-LP 28, holotype. Scale bars represent: 2 mm (A–D, G–K); 1 mm (E–F).
FIGURE 14. A–I in Middle Permian (Roadian) gastropods from the Khao Khad Formation, Central Thailand: Implications for palaeogeography of the Indochina Terrane
FIGURE 14. A–I, Worthenia humiligrada sp. nov. A–D, ESKU-19-LP 22. E–F, ESKU-19-LP 33. G–H, ESKU-19-LP 23. I, ESKU-19-LP 34. J–N, Worthenia cf. pagoda Mansuy, 1912, J, ESKU-19-LP 17. K–N, ESKU-19-LP 66. O–S, Worthenia sp., ESKU-19-LP 88. Scale bars represent: 2 mm (A, B, G, H, I, K, L, O); 1 mm (C, D, J, M, N, P–S); 5 mm (E, F).
FIGURE 4 in Middle Permian (Roadian) gastropods from the Khao Khad Formation, Central Thailand: Implications for palaeogeography of the Indochina Terrane
FIGURE 4. Relative species abundances of major clades of Middle Permian gastropod faunas in Thailand. The gastropod faunas from the Khao Khad Formation (this study), Lopburi province (A) from the Tak Fa Formation, Nakhonsawan province (B) as well as from the Ratburi Limestone, Ratchaburi province (C).
FIGURE 3. A, C in Middle Permian (Roadian) gastropods from the Khao Khad Formation, Central Thailand: Implications for palaeogeography of the Indochina Terrane
FIGURE 3. A, C, Limestone outcrops exposed as the lapiés at the west foot hill of Erawan hill; hammer in the right side for scale (C). B, D, Weathered surface limestones represented by bioclastic packstone as an example for preservation that the studied materials were collected; scale bars represent: 10 cm (B); 2 cm (D).
FIGURE 1 in Middle Permian (Roadian) gastropods from the Khao Khad Formation, Central Thailand: Implications for palaeogeography of the Indochina Terrane
FIGURE 1. Geological map of the study location at Erawan Hill, Chong Sarika sub-district, Phatthana Nikhom district, located about 13 km east of Lopburi Province, Central Thailand.
Data from: Early and Middle Triassic trends in diversity, evenness, and size of foraminifers on a carbonate platform in south China: Implications for tempo and mode of biotic recovery from the end-Permian mass extinction
Delayed biotic recovery from the end-Permian mass extinction has long been interpreted to result from environmental inhibition. Recently, evidence of more rapid recovery has begun to emerge, suggesting the role of environmental inhibition was previously overestimated. However, there have been few high-resolution taxonomic and ecological studies spanning the full Early and Middle Triassic recovery interval, leaving the precise pattern of recovery and underlying mechanisms poorly constrained. In this study, we document Early and Middle Triassic trends in taxonomic diversity, assemblage evenness, and size distribution of benthic foraminifers on an exceptionally-exposed carbonate platform in south China. We observe gradual increases in all metrics through Early Triassic and earliest Middle Triassic time, with stable values reached early in the Anisian. There is little support in our dataset for a substantial Early Triassic lag interval during the recovery of foraminifers or for a step-wise recovery pattern. The recovery pattern of foraminifers on the GBG corresponds well with available global data for this taxon and appears to parallel that of many benthic invertebrate clades. Early Triassic diversity increase in foraminifers was more gradual than in ammonoinds and conodonts. However, foraminifers continued to increase in diversity, size, and evenness into Middle Triassic time, whereas diversity of ammonoids and conodonts declined. These contrasts suggest decoupling of recovery between benthic and pelagic environments; it is unclear whether these discrepancies reflect inherent contrasts in their evolutionary dynamics or the differential impact of Early Triassic ocean anoxia or associated environmental parameters on benthic ecosystems.
FIGURE 1. Salagoulestes wesleyi gen. n in A new Permagrionidae from the Middle Permian of the South of France (Odonatoptera: Protozygoptera)
FIGURE 1. Salagoulestes wesleyi gen. n., sp. n., holotype LdLAP 584 A (imprint), Photograph of wing. Scale bar represents 1 mm.
FIGURE 3. Salagoulestes wesleyi gen. n in A new Permagrionidae from the Middle Permian of the South of France (Odonatoptera: Protozygoptera)
FIGURE 3. Salagoulestes wesleyi gen. n., sp. n., holotype LdLAP 584 A–B, reconstruction of wing. Scale bar represents 2 mm.
FIGURE 2. Salagoulestes wesleyi gen. n in A new Permagrionidae from the Middle Permian of the South of France (Odonatoptera: Protozygoptera)
FIGURE 2. Salagoulestes wesleyi gen. n., sp. n., holotype LdLAP 584 B (counterimprint), Photograph of wing. Scale bar represents 2 mm.
Paleomagnetism of the Middle and Late Permian rocks from eastern Tibet constrains the Late Paleozoic paleography and drift history of the North Qiangtang terrane
<p>The Qinghai-Tibet Plateau comprises a mosaic of geologically distinct Paleozoic and Mesozoic terranes that originated from the northern margin of Gondwana, splitting from it in the Carboniferous or Permian before subsequently drifting northward to collide with Laurasia in the Mesozoic. However, the paleography and drift history of these terranes remain poorly constrained. Here we present new Middle and Late Permian paleomagnetic data from the North Qiangtang Terrane, which allow us to determine that it drifted from ~24°S to ~9°S from the Middle to Late Permian. On the basis of paleomagnetic and geological data of the Tibetan terranes, we propose that the North Qiangtang Terrane was stably located at ~24°S during the Late Carboniferous and Middle Permian, likely affiliated with the Pamir-Qamdo continental archipelago, and the rapid northward drift of the North Qiangtang terrane starts in the Middle Permian.</p>
Figure 13 in The cranial morphology of the temnospondyl Australerpeton cosgriffi (Tetrapoda: Stereospondyli) from the Middle-Late Permian of Paraná Basin and the phylogenetic relationships of Rhinesuchidae
Figure 13. Tympanic cavities of Eryopiformes, including Stereospondyli (see characters 91, 201, 210 in Supporting information Appendix S2). A, Eryops megacephalus (AMNH 23529), dorsal view of the right otic notch. B, Platyoposaurus watsoni (PIN 161/39), posterolateral view of the right otic notch. C, Konzhukovia vetusta (PIN 520/1), dorsal view of the right otic notch. D, Australerpeton cosgriffi (UFRGS-PV-0230-P), posterolateral view of the left otic notch. E, Rhineceps nyasaensis (CAMZM T.259), posterolateral view of the right otic notch. F, Uranocentrodon senekalensis (TM 185), posterolateral view of the left otic notch. Scale bars: A–C, E, F = 3 cm; D = 1 cm. The arrows indicate the dorsal pterygoid crest (white), the stapedial groove (black), and the oblique crest (yellow).
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