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323 results for “Paleontology”
Figure 43 from: Ibrahim N, Sereno PC, Varricchio DJ, Martill DM, Dutheil DB, Unwin DM, Baidder L, Larsson HCE, Zouhri S, Kaoukaya A (2020) Geology and paleontology of the Upper Cretaceous Kem Kem Group of eastern Morocco. ZooKeys 928: 1-216. https://doi.org/10.3897/zookeys.928.47517
Figure 43 Color and size variation in Kem Kem vertebrate fossils. A Theropod distal quadrate (likely from Douira) B Archosaur bone and scute fragments (collected by R. Lavocat, Kouah Trick) C Theropod left scapula (MPDM 40, unknown locality) D Cf. Rebbachisaurus partial dorsal vertebra (NMC 50844, unknown locality) E Small and medium-sized fossil fragments (UCRC unnumbered) F Sieved microfossils (UCRC unnumbered). Scale bars equal 5 cm in A and B, 10 cm in C, 20 cm in D, 5 cm in E, 3 cm in F.
Figure 42 from: Ibrahim N, Sereno PC, Varricchio DJ, Martill DM, Dutheil DB, Unwin DM, Baidder L, Larsson HCE, Zouhri S, Kaoukaya A (2020) Geology and paleontology of the Upper Cretaceous Kem Kem Group of eastern Morocco. ZooKeys 928: 1-216. https://doi.org/10.3897/zookeys.928.47517
Figure 42 Sedimentary matrix associated with Kem Kem fossils. A Well-sorted, fine-grained sandstone on vertebrate bone (Gara Sbaa) B More oxidized coarse-grained matrix with the base of a rostral tooth of Onchopristis numidus ("valley near Boumerade") C Moderately-cemented, red-colored matrix on an isolated archosaur bone (MNHN, unnumbered). Scale bars equal 3 cm in A, 2 cm in B, 5 cm in C.
Figure 41 from: Ibrahim N, Sereno PC, Varricchio DJ, Martill DM, Dutheil DB, Unwin DM, Baidder L, Larsson HCE, Zouhri S, Kaoukaya A (2020) Geology and paleontology of the Upper Cretaceous Kem Kem Group of eastern Morocco. ZooKeys 928: 1-216. https://doi.org/10.3897/zookeys.928.47517
Figure 41 Invertebrate boring structures in dinosaur bone. A Large bone piece showing local concentration of burrows (MNHN-MRS 1568) B Close-up view of two burrows on large bone piece C Burrows of diverse diameter (UCRC I1). Scale bars equal 5 cm in A and 3 cm in C.
Figure 40 from: Ibrahim N, Sereno PC, Varricchio DJ, Martill DM, Dutheil DB, Unwin DM, Baidder L, Larsson HCE, Zouhri S, Kaoukaya A (2020) Geology and paleontology of the Upper Cretaceous Kem Kem Group of eastern Morocco. ZooKeys 928: 1-216. https://doi.org/10.3897/zookeys.928.47517
Figure 40 Taphonomy at Oum Tkout. A Indeterminate paraclupeid fish with mineralized muscles (white) B Soft tissue (muscle) preservation under high magnification C Complete decapod (UCRC PNV2). Scale bars equal 5 mm in A, 10 μm in B, 3 cm in C.
Figure 61 from: Ibrahim N, Sereno PC, Varricchio DJ, Martill DM, Dutheil DB, Unwin DM, Baidder L, Larsson HCE, Zouhri S, Kaoukaya A (2020) Geology and paleontology of the Upper Cretaceous Kem Kem Group of eastern Morocco. ZooKeys 928: 1-216. https://doi.org/10.3897/zookeys.928.47517
Figure 61 Actinopterygian remains from the Kem Kem Group. A-C Possible amiid dentary fragment (MDM 02) in right lateral, medial and dorsal (occlusal) views D Possible amiid dentary fragment (MSNM V 6417) E Dentary of an unidentified teleost (NMC 41883) F Possible notopterid dental plate (NMC 50863) G Probable teleost bone (NMC 41900) H Possible teleost parasphenoid (NMC 50864) I, J Possible Obaichthys africanus (Cavion et al. 2015) scales (NMC 50437) K, L Possible seminotiform scale (NMC 50867A) M-P Possible lepisosteid or obaichthyid vertebra in anterior, posterior, dorsal and ventral view. Scale bars equal 1 cm in A-D, 2 cm in E-L, 2 cm in M-P.
Figure 46 from: Ibrahim N, Sereno PC, Varricchio DJ, Martill DM, Dutheil DB, Unwin DM, Baidder L, Larsson HCE, Zouhri S, Kaoukaya A (2020) Geology and paleontology of the Upper Cretaceous Kem Kem Group of eastern Morocco. ZooKeys 928: 1-216. https://doi.org/10.3897/zookeys.928.47517
Figure 46 Abrasion of Kem Kem fossils (FSAC-KK collection). A Iferda N'Ahouar B Valley near Boumerade. X-axis is the abrasion index (0-4; see Table 3); Y-axis is the number of specimens. Specimen counts in A: 0 37, 1 58, 2 40, 3 13, 4 4. Specimen counts in B: 0 17, 1 15, 2 11, 3 4, 4 3.
Figure 54 from: Ibrahim N, Sereno PC, Varricchio DJ, Martill DM, Dutheil DB, Unwin DM, Baidder L, Larsson HCE, Zouhri S, Kaoukaya A (2020) Geology and paleontology of the Upper Cretaceous Kem Kem Group of eastern Morocco. ZooKeys 928: 1-216. https://doi.org/10.3897/zookeys.928.47517
Figure 54 Selected isolated remains of the sclerorhynchid Onchopristis numidus. Rostral fragment with the bases of two rostral teeth in place (NMC 41876) in (A) ?dorsal, (B) ?ventral and (C) lateral view. Section of a large rostrum (FSAC-KK 937) in (D) dorsal, (E) ventral, (F) anterior and (G) posterior views H Small section of rostrum (NMC 50397) I Isolated rostral tooth J Placoid scale (MNHN-MRS 72) D and H reconstructed to show the approximate shape of the rostral blade. Scale bars equal 5 cm in A-H, 2 cm in I and J.
Figure 49 from: Ibrahim N, Sereno PC, Varricchio DJ, Martill DM, Dutheil DB, Unwin DM, Baidder L, Larsson HCE, Zouhri S, Kaoukaya A (2020) Geology and paleontology of the Upper Cretaceous Kem Kem Group of eastern Morocco. ZooKeys 928: 1-216. https://doi.org/10.3897/zookeys.928.47517
Figure 49 Size of vertebrate fossil elements found in the Kem Kem Group. A Iferda N'Ahouar B 'Valley near Boumerade' locality. X-axis indicates size in 20 mm size bins; Y-axis indicates numbers of specimens. Specimen size bins: 1 0-20 mm 2 21-40 mm 3 41-60 etc.
Figure 4 from: Ibrahim N, Sereno PC, Varricchio DJ, Martill DM, Dutheil DB, Unwin DM, Baidder L, Larsson HCE, Zouhri S, Kaoukaya A (2020) Geology and paleontology of the Upper Cretaceous Kem Kem Group of eastern Morocco. ZooKeys 928: 1-216. https://doi.org/10.3897/zookeys.928.47517
Figure 4 Example Kem Kem localities. A Basal outcrop at Aferdou N'Chaft B Iferda N'Ahouar C Gara Sbaa D Other outcrops at Gara Sbaa E Outcrops south of Jbel Zireg F Outcrop at Moher (south of Tafraoute) near the Morocco-Algeria border.
Figure 66 from: Ibrahim N, Sereno PC, Varricchio DJ, Martill DM, Dutheil DB, Unwin DM, Baidder L, Larsson HCE, Zouhri S, Kaoukaya A (2020) Geology and paleontology of the Upper Cretaceous Kem Kem Group of eastern Morocco. ZooKeys 928: 1-216. https://doi.org/10.3897/zookeys.928.47517
Figure 66 Large specimens from the Kem Kem Group likely referable to Axelrodichthys. Possible fragment of palatoquadrate region preserving a large part of the pterygoid (MNHN-MRS 926) in (A) lateral and (B) medial view. Large quadrate with a small section of the pterygoid (MPDM 14) in (C) lateral and (D) medial view. E Partial palate of Axelrodichthys (MNHN-MRS 1761) in lateral view. Quadrate (NMC 41994) in (F) lateral, (G) medial and (H) ventral view. Scale bars equal 10 cm in A, B and E, and 3 cm in C, D and F-H. Abbreviations: pt pterygoid q quadrate.
Figure 52 from: Ibrahim N, Sereno PC, Varricchio DJ, Martill DM, Dutheil DB, Unwin DM, Baidder L, Larsson HCE, Zouhri S, Kaoukaya A (2020) Geology and paleontology of the Upper Cretaceous Kem Kem Group of eastern Morocco. ZooKeys 928: 1-216. https://doi.org/10.3897/zookeys.928.47517
Figure 52 Decapod prawn Cretapenaeus berberus (Garassino et al. 2006) from Oum Tkout, Douira Formation. Scale bar equals 5 mm.
Figure 7 from: Ibrahim N, Sereno PC, Varricchio DJ, Martill DM, Dutheil DB, Unwin DM, Baidder L, Larsson HCE, Zouhri S, Kaoukaya A (2020) Geology and paleontology of the Upper Cretaceous Kem Kem Group of eastern Morocco. ZooKeys 928: 1-216. https://doi.org/10.3897/zookeys.928.47517
Figure 7 Outcrops of the "Continental intercalaire infracenomanien" in the Kem Kem (near Gara Sbaa). Lines separate the Cenomanian-Turonian platform that caps the "Continental intercalaire" from the upper and lower units.
Figure 36 from: Ibrahim N, Sereno PC, Varricchio DJ, Martill DM, Dutheil DB, Unwin DM, Baidder L, Larsson HCE, Zouhri S, Kaoukaya A (2020) Geology and paleontology of the Upper Cretaceous Kem Kem Group of eastern Morocco. ZooKeys 928: 1-216. https://doi.org/10.3897/zookeys.928.47517
Figure 36 Pebble and fossil lag deposits in the Kem Kem Group. A Common pebble lag deposit composed of two beds B Abraded vertebrate remains including a partial sawfish rostral tooth (Onchopristus numidus). Scale bars equal 60 cm (10 cm intervals) in A and 5 cm in B.
Figure 37 from: Ibrahim N, Sereno PC, Varricchio DJ, Martill DM, Dutheil DB, Unwin DM, Baidder L, Larsson HCE, Zouhri S, Kaoukaya A (2020) Geology and paleontology of the Upper Cretaceous Kem Kem Group of eastern Morocco. ZooKeys 928: 1-216. https://doi.org/10.3897/zookeys.928.47517
Figure 37 Taphonomy of Kem Kem vertebrate bone and teeth. A Articulated fish vertebrae in cross-section at Boumerade. B Cf. Spinosaurus tooth (arrow; FSAC-KK 201) adjacent to rounded pebbles C Concentration of broken bone fragments (<10 cm) D Partial archosaur tooth (MNHN-MRS 1280).
Figure 38 from: Ibrahim N, Sereno PC, Varricchio DJ, Martill DM, Dutheil DB, Unwin DM, Baidder L, Larsson HCE, Zouhri S, Kaoukaya A (2020) Geology and paleontology of the Upper Cretaceous Kem Kem Group of eastern Morocco. ZooKeys 928: 1-216. https://doi.org/10.3897/zookeys.928.47517
Figure 38 Taphonomy of Kem Kem vertebrate bone and teeth. A Isolated theropod quadrate ('valley near Boumerade' locality) B Fragmentary archosaur teeth (Gara Sbaa) C Cf. Spinosaurus vertebral zygapophysis (Gara Sbaa) D Abraded sawfish (Onchopristis numidus) rostral tooth E Isolated mixed sample of small (<1 cm) fossil vertebrates (Boumerade) F Lungfish toothplate (Boumerade). Abbreviations: 1 Turtle carapace fragment, 2 Fish vertebra, 3 Calcified rostral cartilage of Onchopristis numidus.
Figure 34 from: Ibrahim N, Sereno PC, Varricchio DJ, Martill DM, Dutheil DB, Unwin DM, Baidder L, Larsson HCE, Zouhri S, Kaoukaya A (2020) Geology and paleontology of the Upper Cretaceous Kem Kem Group of eastern Morocco. ZooKeys 928: 1-216. https://doi.org/10.3897/zookeys.928.47517
Figure 34 Geology and paleontology at the boundary between the Douira Formation and the Gara Sbaa Member of the Cenomanian-Turonian limestone at Gara Sbaa. A Marly limestone separating the Kem Kem Group from the Cenomanian-Turonian limestone B Close-up of a basal limestone unit in the Gara Sbaa Member C Oyster fossil in situ in the basal limestone D Deep-bodied teleost (Diplomystus sp.) from the Gara Sbaa Member of the Cenomanian-Turonian limestone E Long-bodied teleost (Agoultichthys chattertoni) showing preservation of soft fin structures from the Gara Sbaa Member (Murray and Wilson 2009) D and E from Martill et al. (2011). Scale bars equal 1 cm in D and 2 cm in E.
Figure 39 from: Ibrahim N, Sereno PC, Varricchio DJ, Martill DM, Dutheil DB, Unwin DM, Baidder L, Larsson HCE, Zouhri S, Kaoukaya A (2020) Geology and paleontology of the Upper Cretaceous Kem Kem Group of eastern Morocco. ZooKeys 928: 1-216. https://doi.org/10.3897/zookeys.928.47517
Figure 39 Surface and in situ collecting. A Surface collecting at Gara Sbaa B Collecting in situ fossils at Boumerade.
Figure 33 from: Ibrahim N, Sereno PC, Varricchio DJ, Martill DM, Dutheil DB, Unwin DM, Baidder L, Larsson HCE, Zouhri S, Kaoukaya A (2020) Geology and paleontology of the Upper Cretaceous Kem Kem Group of eastern Morocco. ZooKeys 928: 1-216. https://doi.org/10.3897/zookeys.928.47517
Figure 33 Schematic geography of the major rivers systems in northern and western Africa during the Late Cretaceous (modified from Zellouf and Delfaud 1986, Delfaud 1986, Dutheil 2000). A Kem Kem river system with flow to the north B Kem Kem, paleo-Nile and paleo-Niger river systems. Abbreviations: 1 Meseta 2 Anti-Atlas 3 Ougarta 4 Kem Kem river and delta 5 Paleo-Nile river and delta 6 Paleo-Niger river and delta.
Figure 32 from: Ibrahim N, Sereno PC, Varricchio DJ, Martill DM, Dutheil DB, Unwin DM, Baidder L, Larsson HCE, Zouhri S, Kaoukaya A (2020) Geology and paleontology of the Upper Cretaceous Kem Kem Group of eastern Morocco. ZooKeys 928: 1-216. https://doi.org/10.3897/zookeys.928.47517
Figure 32 Schematic paleoenvironmental stages depicting the Kem Kem region during the Cretaceous. Stages: 1 wide rivers 2 large river systems with substantial sandbanks 3 deltaic conditions 4 rise of the limestone platform.
Figure 30 from: Ibrahim N, Sereno PC, Varricchio DJ, Martill DM, Dutheil DB, Unwin DM, Baidder L, Larsson HCE, Zouhri S, Kaoukaya A (2020) Geology and paleontology of the Upper Cretaceous Kem Kem Group of eastern Morocco. ZooKeys 928: 1-216. https://doi.org/10.3897/zookeys.928.47517
Figure 30 Primary sedimentary structures in the Douira Formation. A Fine-grained interbedding of the upper portion of the Douira Formation underlying the Cenomanian-Turonian limestone B Fine-grained mudrock with vertical paleosol zonation and root traces.
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