Find research datasets worth reusing

Fig. 8 in The gaudryceratid ammonoids from the Upper Cretaceous of the James Ross Basin, Antarctica

Fig. 8. Microconchs of the gaudryceratid ammonoid Anagaudryceras calabozoi Raffi and Olivero sp. nov. from early Campanian (Cretaceous), Antarctica, Rabot Formation, Redonda Point locality. A. CADIC PI 472, holotype, phragmocone and part of the body chamber in lateral (A1) and ventral (A2) views. B. CADIC PI 473, phragmocone and part of the body chamber in lateral (B1) and ventral (B2) views. Arrows mark the beginning of the body chamber.

Fig. 4 in The gaudryceratid ammonoids from the Upper Cretaceous of the James Ross Basin, Antarctica

Fig. 4. The gaudryceratid ammonoid Gaudryceras submurdochi Raffi and Olivero sp. nov., early Campanian (Upper Cretaceous), Antarctica, from Rabot Formation, Redonda Point locality (A–D, F) and Hamilton Norte locality (E) and from Santa Marta Formation, Brandy Bay locality (G). A. CADIC PI 416, holotype, phragmocone and part of the body chamber in lateral (A1) and ventral (A2) views. B. CADIC PI 428, phragmocone and part of the body chamber in lateral (B1) and ventral (B2) views. C. CADIC PI 421, phragmocone and part of the body chamber in lateral (C1) and ventral (C2) views. D. CADIC PI 442, phragmocone in lateral (D1) and ventral (D2) views; the arrows mark the beginnig of the body chamber. E. CADIC PI 417, transversal section to a diameter of 57.5 mm (E1), neanoconch ornamentation (E2). F, G. Neanoconch ornamentation. F. CADIC PI 422. G. CADIC PI 431. The arrows point to major ribs in the neanoconch. Scale bars 1 mm, except E2, F, G 10 mm.

Fig. 6 in The gaudryceratid ammonoids from the Upper Cretaceous of the James Ross Basin, Antarctica

Fig. 6. The gaudryceratid ammonoid Anagaudryceras spp., from the Campanian (Cretaceous), Antarctica, Rabot Formation, Redonda Point locality (A–C), and from the late Campanian–early Maastrichtian (Cretaceous), Antarctica, Snow Hill Island Formation, Sanctuary Cliffs locality (D, E). A, B. Anagaudryceras calabozoi Raffi and Olivero sp. nov. A. CADIC PI 411, holotype, adult macroconch; suture line (A1), transversal section (A2). B. CADIC PI 472, adult microconch; suture line (B1), transversal section (B2). C. Anagaudryceras cf. A. politissimum (Kossmat, 1895), CADIC PI 455, transversal section. D. Anagaudryceras sanctuarium Raffi and Olivero sp. nov., CADIC PI 604, transversal section. E. Anagaudryceras subcompresum Raffi and Olivero sp. nov., CADIC PI 506, holotype, adult specimen; suture line (E1), transversal section (E2). Scale bars 10 mm. Abbreviations: E, external lobe; I, internal lobe; L, lateral lobe; U, umbilical lobe; Us, septal lobe.

Fig. 1 in The gaudryceratid ammonoids from the Upper Cretaceous of the James Ross Basin, Antarctica

Fig. 1. Location map (A) and geological sketch (B) of the James Ross Basin, Antarctica. Abbreviations: C. Lamb, Cpe Lamb; Fm., Formation; MG, Maorites and Grossouvrites Sequence; N, Natalites Sequence; NG, Neograhamites and Gunnarites Sequence; Sant., Santonian; Sst., sandstone.

Fig. 5 in The gaudryceratid ammonoids from the Upper Cretaceous of the James Ross Basin, Antarctica

Fig. 5. The gaudryceratid ammonoid Anagaudryceras, early Campanian (Upper Cretaceous) of Antarctica, from Rabot Formation, Redonda Point locality (A, B) and from Santa Marta Formation, Brandy Bay locality (C, D). A, B. Anagaudryceras cf. A. politissimum (Kossmat, 1895). A. CADIC PI 455. B. CADIC PI 454. C, D. Anagaudryceras sp. juvenile 1. C. CADIC PI 533. D. CADIC PI 534. In lateral (A1–D1) and ventral (A2–D2) views. Arrows mark the beginning of the body chamber.

Fig. 3 in The gaudryceratid ammonoids from the Upper Cretaceous of the James Ross Basin, Antarctica

Fig. 3. Biostratigraphy of Anagaudryceras in the Sanctuary Cliffs Member, Snow Hill Island Formation, Antarctica, early Maastrichtian (A) and the López de Bertodano Formation, Seymour Island, late Maastrichtian (B). Ammonite assemblages by Olivero (2012b), magnetostratigraphic correlation for the Snow Hill Island Formation by Milanese et al. (2017a, b) and for the López de Bertodano Formation by Tobin et al. (2012). Abbreviations: A., Anagaudryceras; Ass., ammonite assemblage; Fm., Formation; G, gravel; M, mud; S, sand; Sst., sandstone.

Fig. 2 in The gaudryceratid ammonoids from the Upper Cretaceous of the James Ross Basin, Antarctica

Fig. 2. Biostratigraphy of lytoceratid ammonites from the Santa Marta and Rabot formations, James Ross Island, early–mid-Campanian. Ammonite assemblages by Olivero (2012b), magnetostratigraphic correlation by Milanese et al. (2017a, b). Abbreviations: Ass., ammonite assemblage; G, gravel; I–III, informal names of the members of the Rabot Formation; M, mud; S, sand.

Fig. 5 in Ammonoid biodiversity changes across the Cenomanian-Turonian boundary in the Yezo Group, Hokkaido, Japan

Fig. 5. Temporal changes in faunal components of ammonoid species richness in the Mikasa area. Abbreviations: CIUs, carbon isotopic units; e., early; m., middle.

Fig. 4 in Ammonoid biodiversity changes across the Cenomanian-Turonian boundary in the Yezo Group, Hokkaido, Japan

Fig. 4. Temporal changes in ammonoid species richness, extinction, and origination rates in the Mikasa, Obira, and Oyubari areas. Abbreviations: CIUs, carbon isotopic units; CTBE, Cenomanian–Turonian boundary event; e., early; m., middle.

Fig. 2 in Ammonoid biodiversity changes across the Cenomanian-Turonian boundary in the Yezo Group, Hokkaido, Japan

Fig. 2. Composite columnar sections in the Mikasa (A), Obira (B), and Oyubari (C) areas and the stratigraphical levels of macrofossil datum planes used in the present study. The shaded portion shows the Cenomanian–Turonian boundary event (CTBE). The molluscan fossil data are from Tanabe et al. (1977), Futakami (1986), Kurihara and Kawabe (2003), Funaki and Hirano (2004), Kurihara et al. (2007) and unpublished original data. The planktonic foraminiferal zonation and the CTBE are from Hasegawa (1997, 1999), Nishi et al. (2003), Kurihara (2006), and Uramoto et al. (2007, 2009). Abbreviations: Ka, Katsurazawa Formation; Hk, Hikagenosawa Formation; mdst, mudstone; sdst, sandstone; A. nipponicus, Actinoceramus nipponicus; Hel. helvetica, Helvetoglobotruncana helvetica; I. hobetsensis, Inoceramus hobetsensis nonsulcatus; I. kamuy, Inoceramus kamuy; W. arc., Whiteinella archaeocretacea.

Fig. 3 in Ammonoid biodiversity changes across the Cenomanian-Turonian boundary in the Yezo Group, Hokkaido, Japan

Fig. 3. Correlation of Upper Cretaceous δ13C stratigraphy of terrestrial organic materials in the Mikasa, Obira, and Oyubari areas, Japan and reference δ13C stratigraphy of carbonates in Europe (after Jarvis et al. 2006). Six carbon isotopic units (CIUs) were identified in the present study. Abbreviations: e., early; m., middle; PDB, Pee Dee Belemnite Standard; Aj, Acanthoceras jukesbrownei; An, Actinoceramus nipponicus; Ar, Acanthoceras rhotomagense; Ca, Calycoceras spp.; Cg, Calycoceras guerangeri; Ci, Cunningtoniceras inertme; Cu, Cunningtoniceras spp.; Cw, Collignoniceras woollgari; Fc, Fagesia catinus; Ih, Inoceramus hobetsensis; Ik, Inoceramus kamuy; Md, Mantelliceras dixoni; Mg, Metoicoceras geslinianum; Mn, Mammites nodosoides; Nj, Neocardioceras juddii; Wd, Watinoceras devonense.

Fig. 3. Scaphitid ammonoid Hoploscaphites constrictus johnjagti Machalski, 2005a in Terminal Maastrichtian ammonites from Turkmenistan, Central Asia

Fig. 3. Scaphitid ammonoid Hoploscaphites constrictus johnjagti Machalski, 2005a, Sumbar River section, Turkmenistan, upper Maastrichtian, Upper Cretaceous, all collected by ASA, with indications in brackets of centimetres below K/Pg boundary (where known). A. NHMM 2011 037, external mould of phragmocone. B. NHMM 2011 039, partial body chamber of macroconch. C. NHMM 2011 036, nucleus. D. NHMM 2011 034, partial phragmocone of?macroconch (15 cm). E. NHMM 2011 038, nucleus (5 cm). F. NHMM 2011 033, near−complete?microconch (18 cm). G. NHMM 2011 035, microconch (5 cm). H. NHMM 2011 040, macroconch.

Fig. 6 in Using abundance data to assess the relative role of sampling biases and evolutionary radiations in Upper Muschelkalk ammonoids

Fig. 6. Percent similarity among bins averaged to 1 degree bins. A. om7 interval. B. om8 interval. C. om9 interval. The thicker the line, the greater the similarity between the two cells connected by the line.

Fig. 4 in Using abundance data to assess the relative role of sampling biases and evolutionary radiations in Upper Muschelkalk ammonoids

Fig. 4. Correlations between richness per map and number of localities. A. om7 interval. B. om8 interval. C. om9 interval. The gap in the distribution of points for the om8 interval highlights the discontinuity between a group of maps with few taxa at a few localities and other maps with a large number of localities and high richness.

Fig. 5 in Using abundance data to assess the relative role of sampling biases and evolutionary radiations in Upper Muschelkalk ammonoids

Fig. 5. Rarefaction curves for each interval, based on number of occurrences. The confidence envelope of the species richness for om9 departs significantly from those of om7 and om8 above 50 occurrences, but the significantly higher species−richness of om8 only becomes apparent at sample sizes of around 250 specimens, indicating that a few, rare taxa are boosting richness in the om8 interval.

Fig. 2 in Using abundance data to assess the relative role of sampling biases and evolutionary radiations in Upper Muschelkalk ammonoids

Fig. 2. Distribution of Muschelkalk ammonoid localities used in this study plotted on a map of modern Germany. The overall geographic spread of localities does not change greatly over time.

Fig. 3 in Using abundance data to assess the relative role of sampling biases and evolutionary radiations in Upper Muschelkalk ammonoids

Fig. 3. Correlations between richness per map and number of occurrences. A. om7 interval. B. om8 interval. C. om9 interval.

Fig. 1 in Using abundance data to assess the relative role of sampling biases and evolutionary radiations in Upper Muschelkalk ammonoids

Fig. 1. Chart of stratigraphic interval names and durations for the Muschelkalk of the Germanic Basin with ammonoid immigration events marked (simplified from Klug et al. 2005: fig. 1).

opencc-by-4.0Jun 2008View details →

Fig. 4 in Double alignments of ammonoid aptychi from the Lower Cretaceous of Southeast France: Result of a post-mortem transport or bromalites?

Fig. 4. Mid−Valanginian aptychi in isolation. A. Single aptychus (one of the pair of plate), FSL 710901, Vergol section, layer 22 (Fig. 2B), Saynoceras verrucosum Zone, Subzone, and Horizon. B. Bivalved aptychi (paired structure), FSL 710902, Vergol section, layer 55 (Fig. 2B), S. verrucosum Zone, Subzone, and Horizon.