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305 results for “palaeoecology”
Fig. 6 in The diploporite blastozoan Lepidocalix pulcher from the Middle Ordovician of northern Algeria: Taxonomic revision and palaeoecological implications
Fig. 6. Oral surface of the diploporite blastozoan Lepidocalix pulcher Termier and Termier, 1950a (MUA. 1024020); Middle Ordovician, Stita, Algeria. A. Four peri-orals (PO1, PO3, PO4, and PO6) between four circum-orals (CO1, CO2, CO4, and CO5), peristome partially covered by small subtriangular oral cover plates biseries, diplopore-bearing polygonal thecal plates immediately surrounding the peristome, hydropore over PO1 and PO6; in external view. B. Surface showing numerous diplopores. Photographs (A1, B1), coloured interpretations (A2, B2) of both surfaces illustrating names using circumorals and periorals (Paul 1973, 2017); in internal view. B–E ambulacral designations in Carpenter's system. Scale bars 5 mm.
Fig. 4 in The diploporite blastozoan Lepidocalix pulcher from the Middle Ordovician of northern Algeria: Taxonomic revision and palaeoecological implications
Fig. 4. Diploporite blastozoan Lepidocalix pulcher Termier and Termier, 1950a (MUA. 1023001); Middle Ordovician, Stita, Algeria. A. Photograph of latex cast of external mould showing spines, tubercles, and the appearance of imbricate plates. B. Camera lucida drawing, note three generations of plates. Scale bars 2 mm.
Fig. 3 in The diploporite blastozoan Lepidocalix pulcher from the Middle Ordovician of northern Algeria: Taxonomic revision and palaeoecological implications
Fig. 3. Original reconstruction of the diploporite blastozoan Lepidocalix pulcher Termier and Termier, 1950a (see Termier and Termier 1959; Kesling 1968). Scale bar 10 mm.
Fig. 17 in Palaeoecology of the Spathian Virgin Formation (Utah, USA) and its implications for the Early Triassic recovery
Fig. 17. Comprehensive model of the Spathian (Lower Triassic) Virgin Formation as recorded in south−western Utah. A. Distribution of sedimentary facies and faunal assemblages. B. Diversity gradient along the general environmental gradient.
Fig. 16 in Palaeoecology of the Spathian Virgin Formation (Utah, USA) and its implications for the Early Triassic recovery
Fig. 16. Trace fossils of the Spathian, Lower Triassic Virgin Formation. A. Thalassinoides cf. suevicus Rieth, 1932 in lower bedding plane view found at the base of beds containing sample BD−A−7, PIMUZ29586. B. Palaeophycus montanus Hall, 1847 in upper bedding plane view observed the lower calcareous unit of section HC−A. C. Spongeliomorpha isp. found at the base of grainstone which represents a lateral equivalent of BD−A−7 in the section BD−C. +
Fig. 14 in Palaeoecology of the Spathian Virgin Formation (Utah, USA) and its implications for the Early Triassic recovery
Fig. 14. Characteristics of the Protogusarella smithi Association showing frequency distribution, trophic nucleus (A) and ecological structure (B). The numbers in the pie−chart sections correspond with the species pertaining to each guild.
Fig. 15. A, B in Palaeoecology of the Spathian Virgin Formation (Utah, USA) and its implications for the Early Triassic recovery
Fig. 15. A, B. Characteristics of the Piarorhynchella triassica Association showing frequency distribution, trophic nucleus (A) and ecological structure (B). C, D. Characteristics of the Bakevellia costata Assemblage showing frequency distribution and trophic nucleus (C) and ecological structure (D). The numbers in the pie−chart sections correspond with the species pertaining to each guild.
Fig. 13 in Palaeoecology of the Spathian Virgin Formation (Utah, USA) and its implications for the Early Triassic recovery
Fig. 13. Characteristics of the Eumorphotis ericius Association showing frequency distribution, trophic nucleus (A) and ecological structure (B).The numbers in the pie−chart sections correspond with the species pertaining to each guild.
Fig. 12 in Palaeoecology of the Spathian Virgin Formation (Utah, USA) and its implications for the Early Triassic recovery
Fig. 12. Characteristics of the Bakevellia exporrecta Association showing frequency distribution and trophic nucleus (A) and ecological structure (B). The numbers in the pie−chart sections correspond with the species pertaining to each guild.
Fig. 11. Q in Palaeoecology of the Spathian Virgin Formation (Utah, USA) and its implications for the Early Triassic recovery
Fig. 11. Q (samples) and R−mode (species) cluster analysis using the unweighted paired group algorithm and Morisita index of similarity. Classes of abundances (circle size) represent the quintiles of absolute−abundance frequencies. Bootstrap values are shown in the white boxes within the Q−mode cluster. Dominance is given as D = 1−Simpson index. A. Bakevellia exporrecta Association. B. Eumorphotis ericius Association. C. Protogusarella smithi Association D. Piarorhynchella triassica Association. E. Bakevellia costata Assemblage. F. Main R−mode cluster incorporating the nuclei of several associations. G. Subcluster reflecting the nucleus of the Bakevellia exporrecta Association and it probably incorporates those species, which are adapted to low energy, softground conditions. H. Subcluster reflecting the nuclei of the Eumorphotis ericius Association and Protogusarella smithi Association, and it incorporates species adapted to high energy, near shore conditions.
Fig. 10 in Palaeoecology of the Spathian Virgin Formation (Utah, USA) and its implications for the Early Triassic recovery
Fig. 10. Fossil bivalves from the Spathian (Lower Triassic) Virgin Formation, Utah, USA. A. Astartidae sp. A, PIMUZ29588. B. Bakevellia exporrecta, PIMUZ29592. C. Bakevellia costata, PIMUZ29614. D. Myalinella sp. A, PIMUZ29597. E. Sementiconcha recuperator, PIMUZ29600. F. Protopis sp. A, PIMUZ29609. G. Leptochondria nuetzeli, PIMUZ29615. H. Eumorphotis virginensis, PIMUZ29616. I. Neoschizodus laevigatus, PIMUZ29599. J. Trigonodus cf. sandbergeri, PIMUZ29603. K. Trigonodus cf. orientalis, PIMUZ29604. L. Unionites cf. fassaensis, PIMUZ2960. M. Promyalina spathi, PIMUZ296102. N. Unionites cf. canalensis, PIMUZ29596. O. Promyalina putiatinensis, PIMUZ29601. P. Pernopecten sp. A., PIMUZ29590. Q. Eumorphotis ericius, PIMUZ29587. R. Eumorphotis cf. multiformis, PIMUZ29613. S. Eumorphotis cf. venetiana, PIMUZ29593. Scale bars 5 mm; except O, P, Q 10 mm.
Fig. 9 in Palaeoecology of the Spathian Virgin Formation (Utah, USA) and its implications for the Early Triassic recovery
Fig. 9. Fossils of the Spathian (Lower Triassic) Virgin Formation, Utah, USA. A. Natiria cf. costata, PIMUZ29595. B. Gastropod ind. A, PIMUZ29594. C. Piarorhynchella triassica, PIMUZ29589. D. Protogusarella smithi, PIMUZ29612. E. Field photograph of Holocrinus smithi, specimen not collected. Topmost limestone of Section HC−A. F. Tirolites sp. A, PIMUZ29591. G. Cypellospongia sp. A, PIMUZ29598. H. Spines of Miocidaris utahensis, PIMUZ29611. Scale bars 5 mm.
Fig. 8 in Palaeoecology of the Spathian Virgin Formation (Utah, USA) and its implications for the Early Triassic recovery
Fig. 8. Sedimentary facies of the Spathian, Lower Triassic in the Hurricane Cliffs area, Utah, USA. A. Middle part (~ 6–12 m) of the Virgin Formation at section HC−A showing the transition between lagoonal and intertidal siltstone to the overlying open marine siltstone. The black arrow heads point to the transgressive surface. Height of exposure is 6 m. B. Alternating marls and limestone in the middle part of the section HC−C interpreted as channel fill of the tidal inlet complex. C. Trough cross−bedded, highly sandy limestone of the upper shoreface capping the section HC−A. D. Hummocky cross−bedded sandstone with Skolithos isp. forming the top of section HC−B. E. Sandy limestone of the shoreface in the middle part (11 m) of section HC−A. F. Parallel stratified grainstone beds forming the topmost beds of HC−C. G. Lagoonal siltstone of the lower part of section HC−D. Height of exposure is 3 m. The hammer is 35 cm long.
Fig. 1 in Palaeoecology of the Spathian Virgin Formation (Utah, USA) and its implications for the Early Triassic recovery
Fig. 1. Localities of the sections mentioned in the text. A. Beaver Dam Area (samples BD and VR). B. Hurricane Cliff Area (samples HC). C. Overview map depicting the position of the study areas (A and B) around St. George, south−western Utah.
Fig. 4 in Palaeoecology of the Spathian Virgin Formation (Utah, USA) and its implications for the Early Triassic recovery
Fig. 4. Stratigraphic sections shown as weathering profile of the Spathian, Lower Triassic in the Beaver Dam Mountains area, Utah, USA. Bathymetric interpretation on the left. Locality map see Fig. 1B. A. Section BD−A. B. Section BD−B. C. Section VR.
Fig. 7 in Palaeoecology of the Spathian Virgin Formation (Utah, USA) and its implications for the Early Triassic recovery
Fig. 7. Stratigraphic sections shown as weathering profile of the Spathian, Lower Triassic in the Hurricane Cliffs area, Utah, USA. See Fig. 1B for locality map. A. Section HC−A. B. Section HC−B. C. Section H−C. D. Section HC−D.
Fig. 1 in Morphology and palaeoecology of a new edrioblastoid (Edrioasteroidea) from the Furongian of China
Fig. 1. Location (A) and geological setting (B) of the studied site (modified from Zhou et al. 2008).
Fig. 3 in Morphology and palaeoecology of a new edrioblastoid (Edrioasteroidea) from the Furongian of China
Fig. 3. Camera lucida drawings of ambulacra and distal stem and holdfast. A, B. Ambulacral construction of Cambroblastus guolensis sp. nov. showing flooring plates, primary cover plates, and smaller secondary cover plates. C. Distal part of the polyplated stem that ends in a distal expanded holdfast composed of minute elements cemented to a trilobite fragment.
Fig. 3 in Palaeoecology of the Spathian Virgin Formation (Utah, USA) and its implications for the Early Triassic recovery
Fig. 3. Palaeogeographic restorations after Blakey (2011). A. Global palaeogeography of the Early Triassic. B. Early Triassic palaeogeography of the western USA.
Fig. 2 in Palaeoecology of the Spathian Virgin Formation (Utah, USA) and its implications for the Early Triassic recovery
Fig. 2. Lithostratigraphic column of the Moenkopi Group in the investigated area. Thickness of lithostratigraphic units and the position of ammonite markers are schematic and not to scale. Presence of Anasibirites after Lucas et al. (2007), Tirolites after Poborski (1954), and Columbites after Bucher in Hautmann et al. (2012).
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