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441 results for “Maastrichtian”
Fig. 8 Broeckinella hensoni n in Broeckinella Hensoni N. Sp., A New Larger Benthic Foraminifera From The Upper Maastrichtian Of Iran And A Revision Of The Genus Broeckinella Henson, 1948
Fig. 8 Broeckinella hensoni n. sp., upper Maastrichtian Tarbur Formation of the Naghan (a, d–e) and Mandegan (b–c, f) sections, Zagros Zone, SW Iran. a Oblique equatorial section. Note porcelaneous test of Cuvillerinella sp. below. b Detail showing fine subepidermal network (sn, below), followed by zone with radial partitions (rp) only and finally the undivided central chamber part with foramina (f) piercing the septa (s). c Oblique section cutting the initial planispiral part. d–e Oblique equatorial sections showing zones of different internal structure (see Text-Figure 3). f Detail from c showing initial planispirally coiled part with numerous chambers. Note also the fine subepidermal network and main partitions (right side). Thin-sections: 2NG 166 (a), Rt 67-1 (b), RT 72 (c, f), 2NG 118 (d), 2NG 172 (e). Scale bars 1.0 mm for a, c–e, 0.2 mm for b and f.
Fig. 5 in Maastrichtian Larger Benthic Foraminifera From The Arabian Plate Sensu Lato: New Data From Somalia, Turkey, And Iran
Fig. 5 Cyclopsinella steinmanni (Munier-Chalmas) from the upper Maastrichtian of Somalia (Auradu Formation: a), Iran (Tarbur Formation: b-c, e-f), and C. steinmanni from the upper Santonian of France (d). a from Luger (2018, pl. 4, fig. 10 as Saudia sp.). b-c, e-f Naghan section. Note the aligned pillars (partly fusing laterally) in b and f, and sporadic rudimentary short rafter (r) in e. d from Gendrot (1964, pl. 1, fig. 10). Abbreviations: pi = pillar, r = rafter, s = septum.
Fig. 4 in Broeckinella Hensoni N. Sp., A New Larger Benthic Foraminifera From The Upper Maastrichtian Of Iran And A Revision Of The Genus Broeckinella Henson, 1948
Fig. 4 Internal structure of Broeckinella arabica Henson. a Drawing of a slightly oblique equatorial section (slightly modified from Henson, 1947, fig. 13c; see also Cherchi and Schroeder 1978, fig. 1C). 1 = subepidermal layer (network; exoskeleton), 2 = zone with transverse partitions only, 3 = undivided chamber interior (lacking endoskeleton); septa with foramina. b Tangential equatorial section of Broeckinella arabica showing the three zones of Henson (1948). Thin-section Rt 85, Mandegan section. c Tangential equatorial section showing main partitions aligned between successive chambers (detail from Fig. 6d). Thin-section NG 42-1, Naghan section.
Fig. 5 Broeckinella hensoni n in Broeckinella Hensoni N. Sp., A New Larger Benthic Foraminifera From The Upper Maastrichtian Of Iran And A Revision Of The Genus Broeckinella Henson, 1948
Fig. 5 Broeckinella hensoni n. sp. (a) and Broeckinella arabica Henson (b–d) from the upper Maastrichtian of the Tarbur Formation, Naghan section. a Foraminiferal wackestone with Broeckinella hensoni n. sp., thin-section 2NG 197. b Foraminiferal wackestone with Broeckinella arabica Henson, 2NG 128-1. c–d Details from b, showing a microspheric specimen. Scale bars in c and d = 1 mm.
Fig. 3 in Broeckinella Hensoni N. Sp., A New Larger Benthic Foraminifera From The Upper Maastrichtian Of Iran And A Revision Of The Genus Broeckinella Henson, 1948
Fig. 3 Naghan section, along the road from Naghan to Izeh with the type-level of Broeckinella hensoni n. sp. marked by an asterisk (left side).
Fig. 1 in Broeckinella Hensoni N. Sp., A New Larger Benthic Foraminifera From The Upper Maastrichtian Of Iran And A Revision Of The Genus Broeckinella Henson, 1948
Fig. 1 Peneroplis aragonensis (Peybernès) nov. comb. a Equatorial section. b Broken axial section (both from Peybernès, 1984, pl. 1, fig. 1 and 7, Late Albian of Spanish Pyrenees). c Detail from d showing fine surface ornamentation (striae). d Slightly oblique equatorial section. e Subaxial section showing fine striae of surface ornamentation (c-e from the Late Albian Barcenaciones Formation, Cantabria, N-Spain, leg M. Najarro).
Fig. 8 in Palynostratigraphic And Palaeoenvironmental Investigations Of The Maastrichtian From Oarda De Jos (Southwestern Transylvanian Basin)
Fig. 8. Local schemes and ranges of selected pollen and spore taxa recovered in the Oarda de Jos section.
Fig. 3 in Palynostratigraphic And Palaeoenvironmental Investigations Of The Maastrichtian From Oarda De Jos (Southwestern Transylvanian Basin)
Fig. 3. Terrestrial palynomorphs (cryptogam spores) recovered from the Oarda de Jos sample, uppermost Cretaceous continental Sebeș Formation, (scale bar 30 µm). a, b. Deltoidospora australis; c. Deltoidospora sp.; d. Microreticulatisporites uniformis; e. Polypodiaceoisporites hojrupensis; f. Densoisporites sp.; g. Gleicheniidites senonicus; h. Biretisporites potoniaei; i. Biretisporites sp.; j. Triplanosporites microsinuosus; k. Uvaesporites sp.; l. Zlivisporites blanensis; m. Laevigatosporites major; n. Laevigatosporites ovatus; o. Laevigatosporites sp.; p. Neoraistrickia sp.; q. Polypodiidites secundus.
Fig. 2 in Palynostratigraphic And Palaeoenvironmental Investigations Of The Maastrichtian From Oarda De Jos (Southwestern Transylvanian Basin)
Fig. 2. Lithological column of the Oarda de Jos (ODA) section (a.- after Dyke et al., 2012, slightly modified), and images of the ODA site before it was covered with soil (June 2015; b.), and after (July 2023; c.).
Fig. 1 in Palynostratigraphic And Palaeoenvironmental Investigations Of The Maastrichtian From Oarda De Jos (Southwestern Transylvanian Basin)
Fig. 1. Geological map of the Sebeș-Oarda de Jos area (re-drawn from Vremir et al., 2013, 2014; simplified).
Fig. 4 in Palynostratigraphic And Palaeoenvironmental Investigations Of The Maastrichtian From Oarda De Jos (Southwestern Transylvanian Basin)
Fig. 4. Gymnosperm and early angiosperm pollen grains recorded in the Oarda de Jos sample, uppermost Cretaceous continental Sebeș Formation (scale bar 30 µm). a, b. Araucariacites australis; c. Callialasporites dampieri; d. Cycadopites sp.; e. Inaperturopollenites sp.; f, g. Trudopollis nonperfectus; h. Trudopollis hojrupensis; i. Trudopollis fossulotrudens; j. Trudopollis granulosus; k. Trudopollis minimus; l. Trudopollis sp.; m. Interporopollenites proporus; n. Interporopollenites klausii.
Fig. 6 in Palynostratigraphic And Palaeoenvironmental Investigations Of The Maastrichtian From Oarda De Jos (Southwestern Transylvanian Basin)
Fig. 6. Photomicrographs of palynofacies components derived from terrestrial plants in the Oarda de Jos sample, uppermost Cretaceous Sebeș Formation. a, b. lath-shaped opaque phytoclasts; c. large corroded opaque phytoclasts, mixed with translucent phytoclasts; d. brown woody tissue with a jellified structure.
Fig. 7 in Palynostratigraphic And Palaeoenvironmental Investigations Of The Maastrichtian From Oarda De Jos (Southwestern Transylvanian Basin)
Fig. 7. Gas chromatogram–mass spectrometry spectra from the Oarda de Jos sample, uppermost Cretaceous continental Sebeș Formation (a), and diverse cross-plots: b, c. - phytane/n-C18 versus pristane/n-C17 (b - after Shanmugam,1985; c - after Dziadzio and Matyasik, 2021), d, e. - Pr/Ph versus Pr/ n-C17 (d - after Yelwa et al., 2022; e. - after Zahra et al., 2015), f. - TOC versus TS (after Pontes et al., 2021), indicating the type of organic matter and depositional environment.
FIGURE 7 in Centropyxis aculeata (testate lobose amoebae) and associated diatoms from the intertrappean lacustrine sediments (Maastrichtian) of central India: Implications in understanding paleolake ecology
FIGURE 7. (Scale bar is 10 µm; EF is England Finder Reading). 1. Azolla cretacea Stanley, 1965; Slide no. BG2 S1; EF L55. 2. Cyathidites australis Couper, 1953 Slide no. BGVN L2; EF Q56. 3. Gabonisporis vigourouxii Boltenhagen, 1967; Slide no. BGVN E4; EF Q52. 4. Aquilapollenites bengalensis Baksi and Deb ex. Samant et al., 2013; Slide no. BGVN 1C6; EF N-34/1. 5. Jiangsupollis sp.; Slide no. BGVN L4, EF 45/1. 6. Proxapertites sulcatus Jaramillo et al., 2011; Slide no. BGVN E4, EF R31/1.
FIGURE 6. 1 in Centropyxis aculeata (testate lobose amoebae) and associated diatoms from the intertrappean lacustrine sediments (Maastrichtian) of central India: Implications in understanding paleolake ecology
FIGURE 6. 1. SEM photograph of Centropyxis aculeata (Ehrenberg, 1832). 2. SEM photographs of the centric diatom Pantocsekiella sp. (internal valve view) on the test of Centropyxis aculeata (Ehrenberg, 1832). 3 and 5. SEM photographs of the pennate diatom Achnanthes sp. on the test of Centropyxis aculeata (Ehrenberg, 1832). 4. SEM photograph of the pennate diatom Oricymba sp. on the wall of Centropyxis aculeata (Ehrenberg, 1832). 6. SEM photograph of the pennate diatom Diadesmis sp. on the wall of Centropyxis aculeata (Ehrenberg, 1832).
FIGURE 4 in Centropyxis aculeata (testate lobose amoebae) and associated diatoms from the intertrappean lacustrine sediments (Maastrichtian) of central India: Implications in understanding paleolake ecology
FIGURE 4. Location of the Bagwanya Intertrappean outcrop, showing lithostratigraphy of the section and correspond- ing lithology of the arcellinidan-bearing horizons.
FIGURE 5 in Centropyxis aculeata (testate lobose amoebae) and associated diatoms from the intertrappean lacustrine sediments (Maastrichtian) of central India: Implications in understanding paleolake ecology
FIGURE 5. (Scale bar for figures 1-6 is 10 µm; EF is England Finder Reading). 1-3. LM photograph of Centropyxis aculeata (Ehrenberg, 1832); 1. Slide no. 1A6, EF H48; 2. 1A3, EF K 40/2; 3. 1A4, EF K40/3. 4. LM photograph of Centropyxis aculeata (Ehrenberg, 1832) with big xenosomes of silica; Slide no 1A4, EF O61/2. 5-6. LM photograph of Centropyxis aculeata (Ehrenberg, 1832) showing presence of xenosomes of variety of diatoms as well as silica grains on the test; 5. Slide no 1A3, EF U38; 6. 1A1, EF E56/1. 7. SEM photograph of Centropyxis aculeata (Ehrenberg, 1832) showing presence of xenosomes of silica. 8. SEM showing magnified view of the same as 7. 9. SEM photograph of Centropyxis aculeata (Ehrenberg, 1832) showing presence of xenosomes of diatoms on the test. 10. SEM photograph of Centropyxis aculeata (Ehrenberg, 1832) showing presence of xenosomes of centric diatoms and silica grains on the test. 11-12 and 15 Centric diatom Cyclotella sp. on the test of Centropyxis aculeata (Ehrenberg, 1832). 13,14. SEM photographs of Centropyxis aculeata (Ehrenberg, 1832).
FIGURE 2 in Centropyxis aculeata (testate lobose amoebae) and associated diatoms from the intertrappean lacustrine sediments (Maastrichtian) of central India: Implications in understanding paleolake ecology
FIGURE 2. Palaeoposition of India - Seychelles during the Cretaceous - Tertiary transition (65 Ma ago), showing the geographical distribution of the Deccan Continental Flood Basalt (DCFB), commonly known as the Deccan Traps. Location of the Deccan-Reunion Hotspot is shown in relation to the geographic limits of the DCFB. The red asterisk marks the location of the Bagwanya Intertrappean outcrop (modified after Chatterjee et al., 2006).
FIGURE 1 in Centropyxis aculeata (testate lobose amoebae) and associated diatoms from the intertrappean lacustrine sediments (Maastrichtian) of central India: Implications in understanding paleolake ecology
FIGURE 1. Map showing the central regions of India covered by the Malwa Group, and the location of the Bagwanya Intertrappean outcrops. Green areas are the extent of the Deccan Continental Flood Basalt (DCFB).
FIGURE 3 in Centropyxis aculeata (testate lobose amoebae) and associated diatoms from the intertrappean lacustrine sediments (Maastrichtian) of central India: Implications in understanding paleolake ecology
FIGURE 3. Palaeoposition of India during the Maastrichtian (68 Ma), showing its location south of the Equator. The red asterisk shows location of the Bagwanya Intertrappean outcrop (modified after Scotese, 2014).
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