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57 results for “Paleoenvironment”
FIGURE 6 in Foraminifera biostratigraphy and paleoenvironment of Well 5, OML 34, Niger Delta, Nigeria
FIGURE 6. Photomicrographic plate of some foraminfera specie from the studied well. 1, Bolivina dilatata, (Reuss) X 100; 2-3, Ammonia beccarii (Linne), (2)Dorsal view X 200, (3) Ventral view X 200; 4, Uvigerina sp. (Cushman) X 150; 5, Hopkinsina bononiensis, (Fornasini) X 150; 6-8, Epistominella vitrea(Parker), (6) Dorsal viewX 200, (7) Edge view X 200, (8) Ventral view X 200; 9, Orbulina universa, (d'Orbigny) X 250; 10, Brizalina interjuncta, (Graham, De Klasz and Rerat) X 150; 11, Heterolepa floridana, (Cushman) X 200; 12, Orbulina suturalis, (Bronnimann) X 250; 13, Praeorbulina glomerosa, (Blow) X 200; 14, Praeorbulina sicana, (Cushman and Stainforth) X 200; 15, Uvigerina isidroensis, (Cushman and Renz) X 150; 16-17, Cibicorbis inflata, (d'Orbigny), (16) Dorsal view X 200, (17) Ventral view X 200; 18, Hanzawaia strattonii, (Applin) X 200; 19-20,Valvulineria gasperensis, (Bermudez) (19) Dorsal view X 200, (20) Ventral view X 200; 21, Lenticulina grandis,(Cushman) X 200; 22, Textularia laminata, (Cushman) X 100; 23, Brizalina mandoroviensis, (Graham) X 100; 24-25, Globorotalia mayeri, (Cushman and Ellisor) (24) Dorsal view X 200, (25) Ventral view X 200.
FIGURE 5 in Foraminifera biostratigraphy and paleoenvironment of Well 5, OML 34, Niger Delta, Nigeria
FIGURE 5. Triangular plot of shell-type ratio, showing portion of intersection as normal marine shelf sea environment (Modified after Murray, 1973).
Supplementary material_Paleoenvironment of the Cerro Negro Formation (Aptian, Early Cretaceous) of Snow Island, Antarctic Peninsula
<p>Supplementary material of the article entitled "Paleoenvironment of the Cerro Negro Formation (Aptian, Early Cretaceous) of Snow Island, Antarctic Peninsula", submitted to Anais da Academia Brasileira de Ciências</p>
FIGURE 4 in Foraminifera biostratigraphy and paleoenvironment of Well 5, OML 34, Niger Delta, Nigeria
FIGURE 4. Sequence Stratigraphy chart showing paleobathymetry of deposition of studied well.
FIGURE 3 in Foraminifera biostratigraphy and paleoenvironment of Well 5, OML 34, Niger Delta, Nigeria
FIGURE 3. Ranges of planktonic foraminifera showing biozones for the studied Well 5.
FIGURE 1 in Foraminifera biostratigraphy and paleoenvironment of Well 5, OML 34, Niger Delta, Nigeria
FIGURE 1. Location of studied well (modified after Odemerho; Urhobo Historical Society, 2008).
Data from: Paleoenvironments shaped the exchange of terrestrial vertebrates across Wallace's Line
<p><span>Faunal turnover in Indo-Australia across Wallace's Line is one of the most recognizable patterns in biogeography and has catalyzed debate about the role of evolutionary and geoclimatic history in biotic interchanges. Here, analysis of over 20,000 vertebrate species with a model of geoclimate and biological diversification shows that broad precipitation tolerance and dispersal ability were key for exchange across the deep-time precipitation gradient spanning the region. Sundanian (Southeast Asian) lineages evolved in a climate similar to the humid 'stepping stones' of Wallacea, facilitating colonization of the Sahulian (Australian) continental shelf. In contrast, Sahulian lineages predominantly evolved in drier conditions, hampering establishment in Sunda, and shaping faunal distinctiveness. We demonstrate how the history of adaptation to past environmental conditions shapes asymmetrical colonization and global biogeographic structure. </span><span>Faunal turnover in Indo-Australia across Wallace's Line is one of the most recognizable patterns in biogeography and has catalyzed debate about the role of evolutionary and geoclimatic history in biotic interchanges. Here, analysis of over 20,000 vertebrate species with a model of geoclimate and biological diversification shows that broad precipitation tolerance and dispersal ability were key for exchange across the deep-time precipitation gradient spanning the region. Sundanian (Southeast Asian) lineages evolved in a climate similar to the humid 'stepping stones' of Wallacea, facilitating colonization of the Sahulian (Australian) continental shelf. In contrast, Sahulian lineages predominantly evolved in drier conditions, hampering establishment in Sunda, and shaping faunal distinctiveness. We demonstrate how the history of adaptation to past environmental conditions shapes asymmetrical colonization and global biogeographic structure.</span></p>
Data from: Paleoenvironments shaped the exchange of terrestrial vertebrates across Wallace’s Line
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Supplementary material for the paper "Paleoenvironment Implications of Layered Ejecta Craters in Chryse Planitia, Mars"
<p>The compressed file contains the spatial crater count (scc) files for crater dating, results of randomness analysis tests and derived model ages with different chronology systems.</p> <p>Table S1 lists all the identified layered ejecta craters in the Chryse Planitia, with a 5-m-per-pixel high resolution context camera (CTX) mosaic as a base map. </p> <p>Table S2 lists all the dating results for selected layered ejecta craters in the Chryse Planitia.</p>
Data from: Anatomy, systematics, paleoenvironment, growth, and age of the sauropod dinosaur Sonorasaurus thompsoni from the Cretaceous of Arizona, USA
Sauropod dinosaurs are rare in the Cretaceous North American fossil record in general and are absent from that record for most of the Late Cretaceous. Sonorasaurus thompsoni from the Turney Ranch Formation of the Bisbee Group of Arizona, USA, potentially represents one of the youngest sauropods before their ca. 30-million-year-long hiatus from the record. The anatomy of Sonorasaurus has only been briefly described, its taxonomic validity has been questioned, several hypotheses have been proposed regarding its phylogenetic relationships, and its life history, geologic age, and reported paleoenvironment are ambiguous. Herein we assess the systematics, paleoenvironment, life history, and geologic age of Sonorasaurus based on firsthand observation, bone histology, and fieldwork in the holotypic quarry and environs. The validity of S. thompsoni is substantiated by autapomorphies. Cladistic analysis firmly places it within the Brachiosauridae, in contrast to results of some recent analyses. Bone histology suggests that the only known exemplar of Sonorasaurus grew slowly and sporadically compared to other sauropods and was approaching its adult size. In contrast with previous assessments of a coastal/estuarine paleoenvironment for the Turney Ranch Formation, our sedimentological and plant macrofossil data indicate that Sonorasaurus lived in a semiarid, low relief evergreen woodland that received highly variable (perhaps seasonal) precipitation. We obtained detrital zircons from the holotypic quarry for U-Pb dating, which only yielded Barremian-aged and older grains, whereas other radiometric and biostratigraphic data suggest that the sediments at the quarry were deposited near the Albian-Cenomanian boundary. Sonorasaurus is taxonomically valid, represents one of the geologically youngest brachiosaurid sauropods, and inhabited a harsh inland evergreen-dominated woodland environment that limited its growth. A review of other Bisbee Group dinosaurs suggests that its fauna, although poorly sampled, exhibits broad similarity to those from coeval North American horizons, reinforcing the apparent faunal homogeneity at the time.
Fig. 3. Flood debris from which the sample for Appendix 1 in Coleoptera in Floods: Biotic Surveys, Fish Food, Adaptation, Reconstruction of Paleoenvironments, and Preconstruction of Neoenvironments
Fig. 3. Flood debris from which the sample for Appendix 1 was taken: Rock Creek Trail, Kensington, Maryland, USA, 21 April 2017.
Fig. 2 in Coleoptera in Floods: Biotic Surveys, Fish Food, Adaptation, Reconstruction of Paleoenvironments, and Preconstruction of Neoenvironments
Fig. 2. Jong-Seok Park and Sarah Samson collecting beetles in a temporary pond created by a flash flood in Hidalgo Co., New Mexico, USA during 2 August 2014. Insert: Beetles waiting out the flood.
FIGURE 9 in Early Miocene stalked crinoids (Echinodermata) from the southern Rhodanian basin (southeastern France). Paleoenvironments and taxonomy
FIGURE 9. Columnals and pluricolumnals of Metacrinus berthei. A: from Les Angles, syntype 4, internodal (MRA 3.009.194.2); B–D: from Notre-Dame du Château, B–C: pluricolumnal, cotype of Pentacrinus miocenicus de Loriol, 1897, fig. 15 (MASRP 2020.5014); D: nodal, cirrus socket, distal facet below (MASRP 2020.5023a); E: from Le Barroux, pluricolumnal (MHNL 20.062715); F–K: from Picabrier (MHNL 20.062721), F: internodale; G: nodale, H–K: sharp-edged internodals with side faces convex in the center, I–J: proximal end of a noditaxis, I: distal symplexy, J: proximal cryptosymplexy of the infranodal, K: pluricolumnal, side view. Scale bar equals 1 mm.
FIGURE 4 in Early Miocene stalked crinoids (Echinodermata) from the southern Rhodanian basin (southeastern France). Paleoenvironments and taxonomy
FIGURE 4. Variation in the general shape and size of the isocrinid columnals of morphotype C from the Palais des Papes in Avignon. Morphotype C is attributed to Metacrinus berthei (see text). See Fig. 3 for abbreviations. Values in mm, except for ratios and number of columnals (Nd and IN).
FIGURE 7 in Early Miocene stalked crinoids (Echinodermata) from the southern Rhodanian basin (southeastern France). Paleoenvironments and taxonomy
FIGURE 7. Columnals and pluricolumùnals of?Endoxocrinus gastaldii. A–B: from Notre-Dame du Château, A: proximal pluricolumnal (cotype of Pentacrinus miocenicus de Loriol, 1897, fig. 18) (MASRP 2020.5012), B: more distal subpentagonal pluricolumnal (MASRP 2020.5022); C–D: from Palais des Papes in Avignon (MHNL 20.062709), C: distal pluricolumnal, D: nodal from proximalmost stalk, proximal symplexial facet; E–J: from Picabrier (MHNL 20.062711), E: internodal from proximal middle stalk, F: internodal from distal middle stalk, G–H: nodal from a young individual, G: oblique proximal view, H: side view showing cirrus sockets, I–J: nodals from large specimens, I: oblique distal view showing the cryptosymplexial facet, J: oblique proximal view showing a cirrus socket. Scale bar equals 1 mm.
FIGURE 3 in Early Miocene stalked crinoids (Echinodermata) from the southern Rhodanian basin (southeastern France). Paleoenvironments and taxonomy
FIGURE 3. Variation in the general shape and size of isocrinid columnals from Picabrier (Caumont-sur-Durance). D: diameter, H: height, IN: internodal, Nd: nodal. Morphotype A is attributed to?Endoxocrinus gastaldii and morphotype B to Metacrinus berthei (see text). Values in mm, except ratios and number of columnals (Nd and IN).
FIGURE 2 in Early Miocene stalked crinoids (Echinodermata) from the southern Rhodanian basin (southeastern France). Paleoenvironments and taxonomy
FIGURE 2. Morphology of crinoid ossicles. A–D in isocrinid stalk, A: side view of a stalk segment (Ci: cirrus, IN: internodal, N: nodal, D: diameter, H: columnal height, Lnd: noditaxis length), B: symplexial facet of metacrinine type (IPZ: interpetaloid zone, PZ: petaloid zone, icr: inner crenularium, igr: interpetaloid groove, lg; ligament area, mdcr: middle crenularium, mgcr: marginal crenularium, pl: perilumen), C: symplexial facet of diplocrinine type (opz: open petaloid zone), C: symplexial facet of balanocrinine type (cpz: close petaloid zone); E–F: in isocrinid arm, E: proximal arm pattern in Metacrinus (IBr: primibrachials, IIBr: secundibrachials, R: radial, s1: synostosis at IBr1+2, s2: synostosis at IBr4+5); F: facet of muscular synarthry (al: aboral ligament depression, il: inner ligament area, m: muscular area, ps:pinnule socket); G–H: in rhizocrinid columnal, G: distal view, H: side view (fr: fulcral ridge, ri: rhizoid insertion). Measured parameters, D: greatest diameter including insertion of rhizoid, D': greatest articular facet diameter without rhizoid insertion, d: smallest articular facet diameter, H: columnal height, ri: rhizoid insertion).
FIGURE 11 in Early Miocene stalked crinoids (Echinodermata) from the southern Rhodanian basin (southeastern France). Paleoenvironments and taxonomy
FIGURE 11. Columnals and pluricolumnals of Metacrinus berthei from the Palais des Papes in Avignon (MHNL 20.062719). A–B: pluricolumnal from the distal stalk of a young individual, A: oblique view, B: side view; C: distal end of a noditaxis from distal stalk, oblique distal view showing the flat, slightly concave cryptosymplexial facet; D–E: distal nodal from a young individual, D: oblique proximal view, E: proximal symplexial facet; F: pentagonal internodal; G: nodal, proximal symplexial facet, close up of center showing inner crenularium with interpetaloid grooves; H: subcircular internodal; I–J: nodal, I: proximal symplexial facet, J: concave cryptosymplexial facet, oblique distal view; K–L: infranodal, convexe distal cryptosymplexial facet, L: close up of lumen filled in by secondary stereom. Scale bar equals 1 mm, except in L where it equals 0.1 mm.
FIGURE 8 in Early Miocene stalked crinoids (Echinodermata) from the southern Rhodanian basin (southeastern France). Paleoenvironments and taxonomy
FIGURE 8. Type series of Metacrinus berthei from Les Angles (after Nicolas 1898 modified). The arrowhead indicates the break separating in two fragments the syntype 1 (A: fragment MRA 3.009.192; B: fragment UCBL-FSL 19099-1); C–D: isolated internodals, C: syntype 3 (MRA 3.009.194.1), D: syntype 4 (MRA 3.009.194.2); E: syntype 5 considered as lost, F: syntype 2 (UCBL-FSL 19099-2); ci: proximal fragments of cirri (3 to 4 cirrals) connected to the nodal, Nd: nodal. Scale bar equals 5 mm, except in C–D where it equals 4 mm.
FIGURE 1 in Early Miocene stalked crinoids (Echinodermata) from the southern Rhodanian basin (southeastern France). Paleoenvironments and taxonomy
FIGURE 1. Miocene sites with stalked crinoids in western Paratethys area, and detailed locations within the Rhône-Provence Bay. Upper left: paleogeographic map (Al: Algeria, BR: Betic Ranges in Spain, Co: Corsica, It: northern Italy, H: Hungary, M: Malta, RP: Rhône-Provence Bay). Rhône-Provence Basin: schematic map with sites (1: Avignon, Palais des Papes; 2: Les Angles; 3: Pierre Longue; 4: Védène; 5: Picabrier, 6: St Rémy-de-Provence; 7: N.D. du Château; 8: Tarascon, 9: Beaucaire; 10: Vigne Gaste, 11: Le Barroux; 12: Entrechaux; A: presumed limit of the Miocene Rhône-Provence Bay, B: enveloppe of Burdigalian marine sediment outcrops, C: sites with stalked crinoids, D: main faults (D1: Nîmes fault, D2a: middle Durance fault, D2b: Aix fault, D3: Salon-Cavaillon fault), E: island or submarine shoal).
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