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139 results for “Early Paleocene”
FIGURE 6 in A new side-neck turtle (Pelomedusoides: Bothremydidae) from the Early Paleocene (Danian) Maria Farinha Formation, Paraíba Basin, Brazil
FIGURE 6. DGEO-CTG-UFPE 6171 in (A) external view (B) cranial view; (C) dorsal view and (D) ventral view. Anatomical abbreviations: pu = púbis; il = ilum; acet = acetabulum.
FIGURE 4 in A new side-neck turtle (Pelomedusoides: Bothremydidae) from the Early Paleocene (Danian) Maria Farinha Formation, Paraíba Basin, Brazil
FIGURE 4. Plastron DGEO-CTG-UFPE 6174 in ventral view (1) and visceral view (2). Anatomical abbreviations: abd = abdominal scute, an = anal scute, ax p = axillary process, cos = costal plate.
FIGURE 1 in A new side-neck turtle (Pelomedusoides: Bothremydidae) from the Early Paleocene (Danian) Maria Farinha Formation, Paraíba Basin, Brazil
FIGURE 1. Simplified geological map of the Paraíba Basin showing the location of the Poty quarry (modified from Albertão & Martins Jr., 2006 and Barbosa & Lima Filho, 2006).
Data from: Chloroplast phylogenomic data support Paleocene - Eocene amphi-Pacific early radiation for the Asian Palmate core Araliaceae
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Data from: Oldest, smallest and phylogenetically most basal pelagornithid, from the early Paleocene of New Zealand, sheds light on the evolutionary history of the largest flying birds
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Data from: Evolutionary ecology of Early Paleocene planktonic foraminifera: size, depth habitat and symbiosis
The carbon stable isotope (δ13C) composition of the calcitic tests of planktonic foraminifera has an important role as a geochemical tracer of ocean carbon system changes associated with the Cretaceous/Paleogene (K/Pg) mass extinction event and its aftermath. Questions remain, however, about the extent of δ13C isotopic disequilibrium effects and the impact of depth habitat evolution on test calcite δ13C among rapidly evolving Paleocene species, and the influence this has on reconstructed surface-to-deep ocean dissolved inorganic carbon (DIC) gradients. A synthesis of new and existing multispecies data, on the relationship between δ13C and δ18O and test size, sheds light on these issues. Results suggest that early Paleocene species quickly radiated into a range of depths habitats in a thermally stratified water column. Negative δ18O gradients with increasing test size in some species of Praemurica suggest either ontogenetic or ecotypic dependence on calcification temperature that may reflect depth/light controlled variability in symbiont photosynthetic activity. The pattern of positive δ13C test-size correlations allows us to (1) identify metabolic disequilibrium δ13C effects in small foraminifera tests, as occur in the immediate aftermath of the K/Pg event, (2) constrain the timing of evolution of foraminiferal photosymbiosis to 63.5 Ma, ∼0.9 Myr earlier than previously suggested, and (3) identify the apparent loss of symbiosis in a late-ranging morphotype of Praemurica. These findings have implications for interpreting δ13C DIC gradients at a resolution appropriate for incoming highly resolved K/Pg core records.
FIGURE 3 in A new side-neck turtle (Pelomedusoides: Bothremydidae) from the Early Paleocene (Danian) Maria Farinha Formation, Paraíba Basin, Brazil
FIGURE 3.Costal plate DGEO-CTG-UFPE 6172 superimposed on dermal plate DGEO-CTG-UFPE 6173.
FIGURE 2 in A new side-neck turtle (Pelomedusoides: Bothremydidae) from the Early Paleocene (Danian) Maria Farinha Formation, Paraíba Basin, Brazil
FIGURE 2. Stratigraphic chart of Poty quarry, Paraíba Basin (modified from Barbosa et al., 2008).
FIG. 8. — Sindhochelys ragei n. gen., n in First report of a bothremydid turtle, Sindhochelys ragei n. gen., n. sp., from the early Paleocene of Pakistan, systematic and palaeobiogeographic implications
FIG. 8. — Sindhochelys ragei n. gen., n. sp., holotype CPAG-RANKT-V-3, from the Paleocene of Ranikot, locality K18-12, Southern Pakistan. A-D, decoration in various parts of the shell: A, isolated piece with the imprint of the mesoplastral external surface; B, marginal part of peripheral 10, dorsal view; C, left costal 1 part, posterior border at mid-width, dorsal view; D, a costal lateral border, in dorsal view; E, right hyoplastral part, ventral view. Scale bar: 5 cm.
FIG. 7. — Sindhochelys ragei n. gen., n in First report of a bothremydid turtle, Sindhochelys ragei n. gen., n. sp., from the early Paleocene of Pakistan, systematic and palaeobiogeographic implications
FIG. 7. — Sindhochelys ragei n. gen., n. sp., holotype CPAG-RANKT-V-3, from the Paleocene of Ranikot, locality K18-12, Southern Pakistan. Medioanterior part of the shell, the nuchal being removed, showing a part of the dorsal face of the anterior lobe with the sulci limiting the overlapping scales. Scale bar: 5 cm.
FIGURE 25 in Patagonia's diverse but homogeneous early Paleocene forests: Angiosperm leaves from the Danian Salamanca and Peñas Coloradas formations, San Jorge Basin, Chubut, Argentina
FIGURE 25. Morphotypes SA042 (Cunoniaceae; continued, see also Figure 16F-M), SA043 (Cunoniaceae?/Sapindaceae? continued, see also Figure 24A-G), SA044 (Cunoniaceae, see also Figure 23J-O), SA045 (Fabaceae; continued, see also Figure 24H-L), and SA046 Laurophyllum chubutensis Berry (Lauraceae, see also Figure 26A-F). A-D, camera lucida drawings (CLD) of morphotype SA042 (Cunoniaceae). A, MPEF-Pb-9069; B, MPEF-Pb-9113 (arrow, an intersecondary vein); C, tooth venation detail of specimen in Figure 25B (arrow, a forked secondary vein); D, tooth venation of specimen in Figure 25A (arrow, an intersecondary vein). E-F, morphotype SA043 (Cunoniaceae?/Sapindaceae?), CLD of MPEF-Pb-6561. G-H, morphotype SA044 (Cunoniaceae), MPEF-Pb-2037 (exemplar, see also Figure 23K, 23O). G, digital overlay drawing (DOD) of tooth venation; H, triangular tooth with glandular apex (arrow). I, morphotype SA046 Laurophyllum chubutensis Berry (Lauraceae), DOD of MPEF-Pb-2039 (exemplar, see also Figure 26A-B), note low rank venation (see also Figure 26A-B). J, morphotype SA045 (Fabaceae), CLD of MPEF-Pb-2038 (exemplar; see also Figure 24I-L), note pulvinulate petiolule (arrow). Single-color scale bars equal 10 mm; grid scales equal one millimeter (per rectangle).
FIG. 2 in Peligrotherium tropicalis (Mammalia, Dryolestida) from the early Paleocene of Patagonia, a survival from a Mesozoic Gondwanan radiation
FIG. 2. — Peligrotherium tropicalis Bonaparte, Van Valen & Kramartz, 1993 (MLP 90-II-12-58), maxillary fragment with right M1-M2, and left M1 fragment and M2-M4, occlusal view. Abbreviations: ca, anterior crista; cp, posterior crista; pa, paracone. Scale bar: 5 mm.
FIG. 3 in Peligrotherium tropicalis (Mammalia, Dryolestida) from the early Paleocene of Patagonia, a survival from a Mesozoic Gondwanan radiation
FIG. 3. — Peligrotherium tropicalis Bonaparte, Van Valen & Kramartz, 1993 (MLP 90-II-12-58), roots of right M1-M2, anterointernal view. Scale bar: 5 mm.
FIG. 31. —A in Dental ontogeny in the early Paleocene placental mammal Alcidedorbignya inopinata (Pantodonta) from Tiupampa (Bolivia)
FIG. 31. —A, transparent lateral view of the left mandible MHNC 8286 of juvenile Alcidedorbignya inopinata (stage 4) showing the trigonid of p4 and protoconid and probable metaconid of m3 in process of mineralisation in their respective crypts; B, enlarged view of the trigonid of p4 in the same position as in its crypt; C, enlarged view of the protoconid and metaconid of m3 in the same position as in its crypt (the cusps of the trigonid of m3 are not in their natural position since they have been displaced and rotated before filling of the crypt with sediment); D, occlusal view of the trigonid of p4; E, occlusal view of the protoconid and metaconid of m3, which have been restored in their original positions. Scale bars: A, 5 mm; B-E, 1 mm.
FIG. 48 in Dental ontogeny in the early Paleocene placental mammal Alcidedorbignya inopinata (Pantodonta) from Tiupampa (Bolivia)
FIG. 48. — Histograms showing the relative proportions of adult and juvenile specimens of Alcidedorbignya inopinata and in the eight stages defined here: A, relative number of minimum number of individuals of adults and juveniles; B, relative number of adult and juvenile jaws; C, distribution of the number of jaw specimens within the juvenile stages; D, distribution of the number of jaw specimens within the adults and juveniles stages defined in text; E, distribution of the minimum number of individuals within the juvenile stages; F, distribution of minimum number of individuals within the adults and juveniles stages defined in text; G, distribution of jaw specimens of the adults and juveniles stages defined in text (stages 1-8) according to their inclusion in IDAS 0-5; H, distribution minimum number of individuals of the adults and juveniles stages defined in text (stages 1-8) according to their inclusion in IDAS 0-5.
FIG. 14 in Dental ontogeny in the early Paleocene placental mammal Alcidedorbignya inopinata (Pantodonta) from Tiupampa (Bolivia)
FIG. 14. — Digital rendering of the skull and mandibles (MHNC 8416) of juvenile Alcidedorbignya inopinata (stage 3): A, ventral view of the skull; B, enlargement of part of the left palate; C, dorsal view of the mandible; D, enlargement of the posterior region of the mandible, showing the opening in the roof of crypts of M2. Scale bars: A, C, 5 mm; B, D, 2 mm.
FIG. 30E-G in Dental ontogeny in the early Paleocene placental mammal Alcidedorbignya inopinata (Pantodonta) from Tiupampa (Bolivia)
FIG. 30E-G. — Slices of lateral and coronal CT-scans of the mandible (MHNC 8286) of juvenile Alcidedorbignya inopinata (stage 4): E, slice 133 of the lateral CTscan; F, slice 154 of the lateral CT-scan; G, slice 553 of the coronal CT scan (slice 553 is dorsal to slice 644). The number for each illustrated slice refers to the position within the sequence of 223 images for A, B and D and 823 images for C and E (resolution binned images voxel size = 0.02781842 mm). Scale bar: 5 mm.
FIG. 34 in Dental ontogeny in the early Paleocene placental mammal Alcidedorbignya inopinata (Pantodonta) from Tiupampa (Bolivia)
FIG. 34. — Wear facets on the first molars of Alcidedorbignya inopinata: A, partial left maxillary (MHNC 13960) of juvenile (stage 4) with M1 featuring a small wear facet on the on the mesial edge of the paraconule and on the preparaconular crista; B, the same with wear facet outlined with a red line; C, partial left mandible (MHNC 13964) of juvenile (stage 4) with m1 showing wear facet on the posterior edge of the protocristid; D, the same with wear facet outlined with a red line. The photographs of this figure have been obtained using an RTI (Reflectance Transforming Imaging) setting as indicated by Decombeix et al. (2021) with some specifications, as follows: we used a Canon EOS 5DS digital camera equipped with a Canon MP-E 65 mm macro lens (both Tokyo, Japan); and LEDs of the two lower rings of the light dome were used (i.e., 42 LEDs). Snapshots were extracted using the default' mode (for A and B, light source coordinates X = –0.34, Y = –0.34); for C and D, light source coordinates X = –0.31, Y = 0.44). Scale bar: 2 mm.
Data from: Evolutionary ecology of Early Paleocene planktonic foraminifera: size, depth habitat and symbiosis
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