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441 results for “Maastrichtian”
FIG. 8 in A new freshwater turtle (Reptilia, Pleurodira, Podocnemidae) from the Upper Cretaceous (Maastrichtian) of Minas Gerais, Brazil
FIG. 8. — Pelvic girdle and hind limb elements of Cambaremys langertoni n. gen., n. sp. (CPP-0252); A-D, left pelvic girdle; A, lateral aspect; B, medial aspect; C, cranial aspect; D, outline of iliac articulation to the carapace, dorsal aspect, arrow points cranially; E, right ischium, medial aspect; F-J, right femur; F, dorsal aspect; G, ventral aspect; H, caudal aspect; I, cranial aspect; J, proximal aspect; K-N, left tibia; K, dorsal aspect; L, ventral aspect; M, lateral aspect; N, medial aspect; O, P, left fibula; O, dorsal aspect; P, ventral aspect. Scale bar: 20 mm.
FIG. 5 in A new freshwater turtle (Reptilia, Pleurodira, Podocnemidae) from the Upper Cretaceous (Maastrichtian) of Minas Gerais, Brazil
FIG. 5. — Reconstruction of the carapace of Cambaremys langertoni n. gen., n. sp. (CPP-0252), dorsal aspect. Abbreviations: axi, axillary process; cos, costal plate; ia, iliac articulation; ing, ingunal process; mar, marginal scute; neu, neural plate; nuc, nuchal plate; per, peripheral plate; ple, pleural scute; ver, vertebral scute. Hatched areas indicate structures on the inner side of the carapace. Non-preserved parts in gray. Scale bar: 20 mm.
FIG. 2 in A new freshwater turtle (Reptilia, Pleurodira, Podocnemidae) from the Upper Cretaceous (Maastrichtian) of Minas Gerais, Brazil
FIG. 2. — Cervicovertebral elements of Cambaremys langertoni n. gen., n. sp. (CPP-0252), possibly from the same vertebra; A, centrum, ventral aspect; B, centrum and neural arch, right lateral aspect; C, neural arch, dorsal aspect; D-G, reconstruction of cervical vertebra; D, ventral aspect; E, dorsal aspect; F, right lateral aspect; G, cranial aspect. Non-preserved parts in gray. Scale bar: 15 mm.
FIG. 4 in A new freshwater turtle (Reptilia, Pleurodira, Podocnemidae) from the Upper Cretaceous (Maastrichtian) of Minas Gerais, Brazil
FIG. 4. — Partial carapace of Cambaremys langertoni n. gen., n. sp. (CPP-0252), visceral aspect. Scale bar: 20 mm.
FIG. 7 in A new freshwater turtle (Reptilia, Pleurodira, Podocnemidae) from the Upper Cretaceous (Maastrichtian) of Minas Gerais, Brazil
FIG. 7. — Pectoral girdle and forelimb elements of Cambaremys langertoni n. gen., n. sp. (CPP-0252); A, B, right scapula; A, cranial aspect; B, caudal aspect; C, D, right coracoid; C, dorsal aspect; D, ventral aspect; E-I, right humerus; E, dorsal aspect; F, ventral aspect; G, caudal aspect; H, cranial aspect; I, proximal aspect; J, K, left radius; J, ventral aspect; K, lateral aspect; L, right radius, ventral aspect; M-P, right ulna; M, dorsal aspect; N, ventral aspect; O, medial aspect; P, lateral aspect. Non-preserved parts indicated by stippled lines. Scale bar: 20 mm.
FIG. 6. — A-E in A new freshwater turtle (Reptilia, Pleurodira, Podocnemidae) from the Upper Cretaceous (Maastrichtian) of Minas Gerais, Brazil
FIG. 6. — A-E, plastral elements of Cambaremys langertoni n. gen., n. sp. (CPP-0252); A, B, right mesoplastron; A, ventral aspect; B, visceral aspect; C, D, right xifiplastron; C, ventral aspect; D, visceral aspect; E, composite reconstruction of the xiphiplastra in ventral and visceral aspects; F, right xifiplastron of cf. Cambaremys langertoni n. gen., n. sp. (CPP-0290) in visceral aspect. Scale bars: 20 mm.
FIG. 3 in A new freshwater turtle (Reptilia, Pleurodira, Podocnemidae) from the Upper Cretaceous (Maastrichtian) of Minas Gerais, Brazil
FIG. 3. — Partial carapace of Cambaremys langertoni n. gen., n. sp. (CPP-0252), dorsal aspect. Scale bar: 20 mm.
Shatsky Rise, ODP Sites 1209 and 1210 Maastrichtian composite bulk carbonate stable isotopes, XRF scanning, biogenic barium, and benthic foraminiferal records
<p>A bulk composite carbonate stable isotope, X-ray fluorescence (XRF) scanning (elemental barium), biogenic barium and benthic foraminiferal record in deep sea sediments from the tropical Pacific was produced from 71.5 to 66 million years ago to determine variations in carbon export in the Pacific during the Maastrichtian. The cores were drilled on Shatsky Rise in the tropical Pacific at Ocean Drilling Program (ODP) Leg 198 Sites 1209 and 1210. Method details and interpretation are in the publication.</p>
Fig. 20 in The lambeosaurine dinosaur Amurosaurus riabinini, from the Maastrichtian of Far Eastern Russia
Fig. 20. Skull of Jaxartosaurus aralensis Riabinin, 1939 in dorsal view. A: PIN 1/5009; B, after Norman and Sues (2000).
Fig. 15. Amurosaurus riabinini. A in The lambeosaurine dinosaur Amurosaurus riabinini, from the Maastrichtian of Far Eastern Russia
Fig. 15. Amurosaurus riabinini. A. Diagrammatical drawing of the left pubis (AEHM 1/263) in medial view. B. Left ilium (AEHM 1/264) in lateral view. C. Left ischium (AEHM 1/269) in lateral view. D. Right femur (AEHM 1/265) in lateral (D1), cranial (D2), medial (D3), and caudal (D4) views.
Fig. 1 in The lambeosaurine dinosaur Amurosaurus riabinini, from the Maastrichtian of Far Eastern Russia
Fig. 1. Map with the geographical location of the dinosaur localities in the Amur region (Russia) and in Heilongjiang Province (P.R. China).
Fig. 19 in The lambeosaurine dinosaur Amurosaurus riabinini, from the Maastrichtian of Far Eastern Russia
Fig. 19. Cladogram of Lambeosaurinae, showing the phylogenetic relationships of Amurosaurus riabinini. List of apomorphies for all ingroup taxa. Letters indicate nodes. For multistate characters, the number between brackets refers to the character state (see Appendix 1). Character are followed by an "a", when supported only by ACCTRAN or fast optimisation, and by a "d", when supported only by DELTRAN, or slow optimisation. Node A (Hadrosauridae): 15, 19, 21, 24, 25, 26, 27, 28, 30, 33, 34, 36, 37; Node B (Hadrosaurinae): 8, 10, 12, 22, 32, 38(2); Node C (Lambeosaurinae): 2, 3, 5, 7a, 11a, 16, 20, 23, 31, 35, 38(1); Node D: 4(1); Node E: 18; Node F: 6, 7d, 11d; Node G (parasauroloph clade, named according to Chapman and Brett−Surman 1990): 1, 4(2), 17, 39, 40; Node H (corythosaur clade, named according to Chapman and Brett−Surman 1990): 9, 13; Node I: 14(1).
Fig. 14. Amurosaurus riabinini. A in The lambeosaurine dinosaur Amurosaurus riabinini, from the Maastrichtian of Far Eastern Russia
Fig. 14. Amurosaurus riabinini. A. Right humerus (AEHM 1/278) in caudal (A1) and cranial (A2) views. B. Left ulna (AEHM 1/267) in lateral (B1) and cranial (B2) views. C. Left radius (AEHM 1/268) in caudal (C1) and medial (C2) views.
Fig. 3. A in The lambeosaurine dinosaur Amurosaurus riabinini, from the Maastrichtian of Far Eastern Russia
Fig. 3. A. Sketch showing bonebed at Blagoveschensk dinosaur locality. B. Diagram showing orientations of long bones at Blagoveschensk dinosaur locality.
Fig 10 in The lambeosaurine dinosaur Amurosaurus riabinini, from the Maastrichtian of Far Eastern Russia
Fig 10. Left maxilla of Amurosaurus riabinini (AEHM 1/12) in lateral (A, C) and medial (B, D) views.
Fig. 5 in The lambeosaurine dinosaur Amurosaurus riabinini, from the Maastrichtian of Far Eastern Russia
Fig. 5. Braincase of Amurosaurus riabinini (AEHM 1/232) in left (A, C) and right (B, D) lateral views. E. Detail of the right side of the braincase.
Fig. 12. Amurosaurus riabinini. A in The lambeosaurine dinosaur Amurosaurus riabinini, from the Maastrichtian of Far Eastern Russia
Fig. 12. Amurosaurus riabinini. A. Cranial cervical vertebra (AEHM 1/275) in cranial (A1) and left lateral (A2) views. B. Dorsal vertebrae (AEHM 1/297–299) in left lateral (B1) and caudal (B2) views. C. Partial sacrum (AEHM 1/296) in ventral (C1) and cranial (C2) views. D. Caudal vertebrae (AEHM 1/304–307) in left lateral (D1) and caudal (D2) views.
Fig. 9. Amurosaurus riabinini. A in The lambeosaurine dinosaur Amurosaurus riabinini, from the Maastrichtian of Far Eastern Russia
Fig. 9. Amurosaurus riabinini. A. Left jugal (AEHM 1/112) in medial (A1) and lateral (A2) views. B. Right squamosal (AEHM 1/240) in lateral (B1) and medial (B2) views. C. Right quadrate (AEHM 1/42) in lateral (C1) and medial (C2) views.
Evolutionary stasis, ecophenotypy, and environmental controls on ammonite morphology in the Late Cretaceous (Maastrichtian) Western Interior Seaway, USA
<p class="Abstract">We test for the presence of evolutionary stasis in a species of Late Cretaceous ammonoid cephalopod, <i>Hoploscaphites nicolletii</i>, from the North American Western Interior Seaway. A comprehensive dataset of morphological traits was compiled across the entire spatial and temporal range of this species. These were analyzed in conjunction with sedimentologically and geochemically derived palaeoenvironmental conditions hypothesized to apply selective pressures. All changes in shell shape were observed to be ephemeral and reversable, that is, no unidirectional trend could be observed in any of the morphological traits analyzed. Correlations between palaeoenvironmental conditions and morphological traits suggests ecophenotypic processes were at play, however, either environmental changes were too minor and/or provided no isolating mechanism to drive speciation. These data support mechanisms of stasis such as homogenizing gene flow or stabilising selection under a fluctuating optimum (likely reflecting spatiotemporally heterogeneous palaeoenvironmental conditions). Finally, changes in shell size were not significantly associated with changes in shell-specific δ<sup>18</sup>O, despite a correlation between shell size and δ<sup>18</sup>O averaged across horizons. This suggests a mismatch in scales of geochemical sampling that supports caution when making broad interpretations based on averaged geochemical data.</p>
Data from: Type Maastrichtian gastropod faunas evidencing rapid ecosystem recovery following the Cretaceous-Palaeogene boundary
The study of the global mass extinction event at the Cretaceous–Palaeogene (K/Pg) boundary can aid in understanding patterns of selective extinction and survival, and dynamics of ecosystem recovery. Outcrops in the Maastrichtian type area (southeast Netherlands, northeast Belgium) comprise an exceptionally expanded K/Pg boundary succession that offers a unique opportunity to study marine ecosystem recovery within the first thousands of years following the mass extinction event. A quantitative analyses was performed on systematically sampled macrofossils of the topmost Maastrichtian and lowermost Danian strata at the former Curfs-Ankerpoort quarry (Geulhem), which represent 'snapshots' of the latest Cretaceous and earliest Palaeogene marine ecosystems, respectively. Molluscs in particular are diverse and abundant in the studied succession. Regional ecosystem changes across the K/Pg boundary are relatively minor, showing a decline in suspension feeders, accompanied by an ecological shift to endobenthic molluscs. The earliest Paleocene gastropod assemblage retains many 'Maastrichtian' features and documents a fauna that temporarily survived into the Danian. The shallow, oligotrophic carbonate platform in this area was inhabited by taxa that were adapted to low nutrient levels and resistant to starvation. As a result, the local taxa were less affected by the short-lived detrimental conditions related to K/Pg boundary perturbations, such as darkness, cooling, starvation and ocean acidification. This resulted in relatively high survival rates, which enabled rapid recolonization and recovery of marine faunas in the Maastrichtian type area.
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