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32 results for “London Clay”
FIGURE 10 in On the "screamer-like" birds from the British London Clay: An archaic anseriform-galliform mosaic and a non-galloanserine "barb-necked" species of Perplexicervix
FIGURE 10. Undetermined birds that were likened to Danielsavis by Houde et al. (2023). A, partial skeleton of Aves indet. A (NMS.Z.2021.40.5). B, C, left tarsometatarsus of Aves indet. A (NMS.Z.2021.40.8) in plantar (B) and dorsal (C) view. D, partial skeleton of Aves indet. B (NMS.Z.2021.40.4). E‒H, right quadrate of Aves indet. A (NMS.Z.2021.40.5) in lateral (E), caudal (F), medial (G), and ventral (H) view. I, J, right pterygoid of Aves indet. B (NMS.Z.2021.40.4) in lateral (I) and dorsal (J) view. K, distal end of right tarsometatarsus of Aves indet. B (NMS.Z.2021.40.4) in distal view. L, distal end of left tarsometatarsus of Aves indet. A (NMS.Z.2021.40.8) in distal view. M, proximal end of left tarsometatarsus of Aves indet. A (NMS.Z.2021.40.8) in proximal view. Abbreviations: cdc, condylus caudalis; cdm, condylus medialis; cdp, condylus pterygoideus; cpo, capitulum oticum; cps, capitulum squamosum; for, foramen; orb, processus orbitalis; tsc, tuberculum subcapitulare. The scale bars equal 10 mm.
FIGURE 6 in On the "screamer-like" birds from the British London Clay: An archaic anseriform-galliform mosaic and a non-galloanserine "barb-necked" species of Perplexicervix
FIGURE 6. Danielsavis nazensis Houde et al., 2023, comparison of tibiotarsus, tarsometatarsus, pedal phalanges with other galloanserine birds. A, D. nazensis (holotype, NMS.Z.2021.40.1), distal end of right tibiotarsus; the arrow denotes an enlarged detail of the bone. B, distal end of right tibiotarsus of the anseriform Saintandrea chenoides from the late Oligocene of France (holotype, NMB Mar. 874e). C, mirrored distal end of left tibiotarsus of an unnamed galliform from the early Eocene of Egem in Belgium (IRSNB Av 168); coated with ammonium chloride. D‒G, D. nazensis (holotype, NMS.Z.2021.40.1), right tarsometatarsus in distal (D), proximal (E), dorsal (F), and plantar (G) view; the arrow denotes an enlarged detail of the proximal end of the bone. H, I, D. nazensis (NMS.Z.2021.40.3), proximal end of right tarsometatarsus in proximal (H) and plantar (I) view. J, D. nazensis (NMS.Z.2021.40.3), distal end of right tarsometatarsus in plantar view; the arrow denotes an enlarged detail of the bone. K, D. nazensis (holotype, NMS.Z.2021.40.1), non-ungual pedal phalanges; the asterisk indicates a mirrored phalanx. L, mirrored left foot of Chauna torquata (Anhimidae, Anseriformes; SMF 19920). M, right foot of Pavo cristatus (Phasianidae, Galliformes; SMF 20342). N, mirrored distal end of left tarsometatarsus of Anachronornis anhimops (holotype, coated with ammonium chloride; from Houde et al., 2023: figure 2, published under a CC BY 4.0 license) in plantar view. The dotted lines in A‒C indicate the midline of the distal tibiotarsus. The arrows in K‒M denote the length of the third phalanx of the fourth toe. Abbreviations: cdl, condylus lateralis; cdm, condylus medialis; cmh, crista medialis hypotarsi; ext, sulcus extensorius; fdl, sulcus for musculus flexor digitorum longus; fhl, sulcus for musculus flexor hallucis longus; ltr, lateral rim of plantar articular surface of trochlea metatarsi III; mdr, medial rim of plantar articular surface of trochlea metatarsi III; pst, pons supratendineus. The scale bars equal 10 mm.
Reassessing variations in the small-strain stiffness of London Clay
<p>Supplementary dataset for "Reassessing variations in the small-strain stiffness of London Clay" Le, Standing and Potts (2023), Géotechnique. https://doi.org/10.1680/jgeot.21.00292</p> <p> </p> <p> </p>
FIGURE 5 in On the "screamer-like" birds from the British London Clay: An archaic anseriform-galliform mosaic and a non-galloanserine "barb-necked" species of Perplexicervix
FIGURE 5 (caption on next page).
FIGURE 8 in On the "screamer-like" birds from the British London Clay: An archaic anseriform-galliform mosaic and a non-galloanserine "barb-necked" species of Perplexicervix
FIGURE 8 (caption on next page).
FIGURE 2 in On the "screamer-like" birds from the British London Clay: An archaic anseriform-galliform mosaic and a non-galloanserine "barb-necked" species of Perplexicervix
FIGURE 2 (caption on next page).
Data from: Revision of Icacinaceae from the Early Eocene London Clay flora based on X-ray micro-CT
The Early Eocene (Ypresian) London Clay Formation contains one of the most important fruit and seed assemblages from the Paleogene, including a large diversity of taxa (>350 spp.) preserved as pyrite permineralizations retaining 3D structure as well as anatomical detail. Despite the importance of the flora for understanding angiosperm biogeographic and evolutionary history, the majority of the fossil material has not been revisited since the original taxonomic treatments by E.M. Reid and M.E.J. Chandler. Given subsequent advances in our understanding of angiosperm phylogeny and fruit morphology, coupled with technological advances in imaging/visualizing fossil material, many of the taxa represented in the flora deserve further study. Here we present a revision of the pantropical family Icacinaceae using X-ray micro-computed tomography (micro-CT) images of 21 species from the flora. Based on the results, four new combinations are made, a new fossil-genus is established for a distinctive species with affinities to the Phytocreneae, and emended diagnoses are provided for eight taxa. Of the seven genera recognized from the flora, only one, Iodes Blume, is extant. This study offers important insights on the biogeographic and evolutionary history of Icacinaceae, which is one of the most abundant and diverse components of the flora from the London Clay Formation.
Reassessing variations in the small-strain stiffness of London Clay
<p>Supplementary dataset for "Reassessing variations in the small-strain stiffness of London Clay" Le, Standing and Potts (2023), Geotechnique.</p>
Data from: Revision of Icacinaceae from the Early Eocene London Clay flora based on X-ray micro-CT
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Data from: Morphology and phylogenetic relationships of fossil snake mackerels and cutlassfishes (Trichiuroidea) from the Eocene (Ypresian) London Clay Formation
'Gempylids' (snake mackerels) and trichiurids (cutlassfishes) are pelagic fishes characterised by slender to eel-like bodies, deep-sea predatory ecologies, and large fang-like teeth. Several hypotheses of relationships between these groups have been proposed, but a consensus remains elusive. Fossils attributed to 'gempylids' and trichiurids consist almost exclusively of highly compressed body fossils and isolated teeth and otoliths. We use micro-computed tomography to redescribe two three-dimensional crania, historically assigned to †Eutrichiurides winkleri and †Progempylus edwardsi, as well as an isolated braincase (NHMUK PV OR 41318). All from the London Clay Formation (Eocene: Ypresian), these specimens represent some of the oldest fossils identified as trichiuroids. We find that †Eutrichiurides winkleri does not show diagnostic characters of †Eutrichiurides, and it is assigned to a new genus. In order to investigate the placement of these fossils relative to extant lineages, we combine existing morphological character sets for 'gempylids' and trichiurids along with published mitogenomic data in order to investigate the placement of these fossils relative to extant lineages. Our analyses recover a monophyletic Trichiuridae nested within a paraphyletic 'Gempylidae'. The taxon formerly known as †Eutrichiurides winkleri is considered Trichiuroidea incertae sedis, while †Progempylus edwardsi and NHMUK PV OR 41318 are recovered within the 'gempylid' grade. Using previously published descriptions and character optimisations from our phylogenetic analyses we suggest possible placements for laterally compressed body fossils historically associated with Trichiuroidea (†Argestichthys, †Abadzekia, †Chelifichthys, †Anenchelum, †Eutrichiurides, †Musculopedunculus).
Data from: Morphology and phylogenetic relationships of fossil snake mackerels and cutlassfishes (Trichiuroidea) from the Eocene (Ypresian) London Clay Formation
Open the record for dataset details and reuse information.
Database obtained through numerical modelling comprising short-term vertical displacements around a shaft excavated in London Clay
<p>The database was generated via finite element axisymmetric analysis of the excavation of a shaft in London Clay. It includes vertical displacements troughs around the shaft (from 0.1m to a radial distance equal to 2xShaft depth) extracted at depth intervals of 0.1xShaft depth, from the surface to the shaft depth. </p>
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