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403 results for “Paleogene”
Figure 25 in Paleogene marine bivalves of the deep-water Keasey Formation in Oregon, Part II: The pteriomorphs
Figure 25. Holotype and paratype of Acesta oregonensis (Clark, 1925). A. Clark's trimmed and retouched original figure of Keasey holotype, right valve, UCMP 30303. B. Unmodified color image of holotype in matrix. C. Clark's original figure of the paratype, left valve, UCMP 30312. D. Unmodified color image of paratype in matrix. Scale bars=1 cm.
Figure 27 in Paleogene marine bivalves of the deep-water Keasey Formation in Oregon, Part II: The pteriomorphs
Figure 27. Acesta oregonensis (Clark, 1925). Hypotype, UCMP 110741. A. Right valve in matrix with adhering interior (aragonitic) and exterior (calcitic) shell layers. Scale bar=5 cm. B. Fragments of exfoliated aragonitic layers from A.
Figure 24 in Paleogene marine bivalves of the deep-water Keasey Formation in Oregon, Part II: The pteriomorphs
Figure 24. Living type species of Acesta, A. excavata (Fabricius, 1799), SBMNH 616346. Norway. A. Left valve exterior. B. Left valve interior. Scale bar=5 cm.
Figure 15 in Paleogene marine bivalves of the deep-water Keasey Formation in Oregon, Part II: The pteriomorphs
Figure 15. Dense concentrations of mud pectens in matrix. A. Delectopecten keaseyorum n. sp. in silty mudstone, middle member. B. Delectopecten keaseyorum in tuffaceous siltstone. C. Delectopecten kieli n. sp. in silty mudstone with echinoid spines. D. Delectopecten kieli in silty mudstone with fish scales and bone. Scale bars= 1cm.
Figure 14 in Paleogene marine bivalves of the deep-water Keasey Formation in Oregon, Part II: The pteriomorphs
Figure 14. Unidentified isognomonid shell with successive nested nacreous layers separated by diagenetic loss of organic shell layers, unidentified species, Miocene of Maryland, Loc. UCMP B-5162. Scale bar=1 cm.
Figure 23 in Paleogene marine bivalves of the deep-water Keasey Formation in Oregon, Part II: The pteriomorphs
Figure 23. Propeamussium (Parvamussium) mistensis n. sp., reconstruction of major features of shell morphology based on all material examined. A. Left valve exterior. B. Left valve interior. C. Right valve exterior. D. Right valve interior. Dashed lines in C, D indicate extent of the larger left valve and uncalcified flexible apron of right valve.
Figure 10. Living and fossil limopsids. A, B in Paleogene marine bivalves of the deep-water Keasey Formation in Oregon, Part II: The pteriomorphs
Figure 10. Living and fossil limopsids. A, B. Exterior and interior of left valve, Limopsis panamensis Dall (1902), SBMNH 474078, scale bar=1 cm. C, E. Limopsis squiresi n. sp., Keasey Formation holotype, UCMP 110728. C. Left valve shell interior and resilifer preserved dorsally in matrix, with remnant periostracum and exterior shell of right valve preserved ventrally. E. Fragment of right valve exterior outlined in yellow on C, removed and inverted. Scale bar=5 mm. (D). Limopsis marysvillensis (Dickerson, 1913), Capay formation holotype, UCMP 11766.
Figure 6 in Paleogene marine bivalves of the deep-water Keasey Formation in Oregon, Part II: The pteriomorphs
Figure 6. Porterius gabbi (Dickerson, 1917), Gries Ranch Formation. A. left valve interior of Effinger (1938) hypotype UCMP 32429, scale bar=5 mm. B, C. Interior and exterior of adult right valve, hypotype UCMP 110738, scale bar=1 cm. D, E. Interior and exterior of juvenile left valve, hypotype UCMP 110739, scale bar=5 mm. F. Detail of rib increase by splitting from C. G. Detail of cardinal area and hinge plate from B: hl=hinge line, lg=ligament grooves on cardinal area, at=anterior hinge teeth, eg=edentulous gap, pt=posterior hinge teeth.
Figure 19. Delectopecten keaseyorum n in Paleogene marine bivalves of the deep-water Keasey Formation in Oregon, Part II: The pteriomorphs
Figure 19. Delectopecten keaseyorum n. sp. Holotype and two paratypes in matrix. A. Partial left valve exterior over nested right valve fragments, Holotype UCMP 110760. B. Right valve of paratype exterior partially overlapping holotype, UCMP 110761. C. Right valve exterior partially overlapping adjacent paratype, UCMP 110762. Scale bar for A–C=5 mm. D. Detail of fine camptonectes sculpture on holotype. E. Right valve exterior of paratype in matrix preserving ctenolium denticles in byssal notch (yellow arrow), UCMP 110763. Scale bar=1 mm.
Figure 1 in Paleogene marine bivalves of the deep-water Keasey Formation in Oregon, Part II: The pteriomorphs
Figure 1. Type species of Crenella, C. decussata (Motagu,1808). A. Left valve exterior of double-valved specimen with byssal threads cemented to shell fragments. B. Right valve interior. SBMNH 214640. Scale bar=1 mm.
Figure 9 in Paleogene marine bivalves of the deep-water Keasey Formation in Oregon, Part II: The pteriomorphs
Figure 9. Comparison of dorsal slope angles in Juvenile and adult shells of Glycymeris andersoni Dickerson (1917) and Glycymeris winlockensis Effinger (1938), Gries Ranch Formation. A. Adult G. andersoni hypotype UCMP 110732, scale bar=1 cm. B. Adult G. winlockensis hypotype UCMP 110734, scale bar=1 cm. C. Juvenile G. andersoni hypotype UCMP 110733, scale bar=5 mm. D. Juvenile G. winlockensis hypotype UCMP 110735, scale bar=5 mm.
Figure 8 in Paleogene marine bivalves of the deep-water Keasey Formation in Oregon, Part II: The pteriomorphs
Figure 8. Glycymeris andersoni Dickerson (1917), Gries Ranch Formation. A. Interior of right valve, hypotype UCMP 110730. B, C. Exterior and interior of right valve, hypotype UCMP 110729. D, E. Ventral and do2rsal of articulated valves, hypotype UCMP 110731. Scale bars=1 cm.
Figure 3 in Paleogene marine bivalves of the deep-water Keasey Formation in Oregon, Part II: The pteriomorphs
Figure 3. Crenella porterensis Weaver (1912) (A–C, E) and C. washingtonensis Weaver (1916) (D, F). A. Articulated, left valve, hypotype UCMP 32410, Lincoln Creek Formation, height 18.2 mm. B. articulated, hypotype USNM 561803, Keasey Formation, height 13.5 mm. C. Exterior mold in matrix, hypotype UCMP 110725, Keasey Formation, height 10.8 mm. D. Right valve, hypotype UCMP 32250, Blakeley Formation, height 12.5 mm. E. Partial shell exterior in matrix, hypotype UCMP 110726, Keasey Formation, height 10.3 mm. F. Partial shell exterior in matrix, hypotype 110727, Keasey Formation, height 5.4 mm.
Figure 7 in Paleogene marine bivalves of the deep-water Keasey Formation in Oregon, Part II: The pteriomorphs
Figure 7. Porterius woodfordi (Hanna, 1927), Ardath Shale, paratype UCMP 31063. A. Exterior of with numerous very fine radial ribs, scale bar=1 cm B. previously unfigured cardinal area and hingeplate, scale bar=1 mm.
Figure 2 in Paleogene marine bivalves of the deep-water Keasey Formation in Oregon, Part II: The pteriomorphs
Figure 2. Alternative reconstructions of the life habit of Crenella decussata. A. Completely encased in crypt of cemented sedimentary grains, living below sediment-water interface in North Atlantic. B, C. Byssus attached to shell fragments, living at sedimentwater interface in North Pacific.
Figure 18. Delectopecten kieli n in Paleogene marine bivalves of the deep-water Keasey Formation in Oregon, Part II: The pteriomorphs
Figure 18. Delectopecten kieli n. sp. Low voltage scanning Electron Micrographs. A. Right valve exterior, Paratype, UCMP 110750. B. Right valve exterior, Paratype, UCMP 110751. C. Right valve exterior UMMP 110752. D. Right valve exterior, Paratype UCMP 110753. E. Left valve exterior, Paratype, UCMP 110754. F. Left valve exterior, Paratype UCMP 110755. G. Right valve interior, Paratype UCMP 110756. H. Right valve interior, Holotype, UCMP 110746. I. Right valve interior, Paratype UCMP 110757. J. Articulated, left valve exterior rotated within right valve interior, Paratype UCMP 110758. K. Detail of sculpture on J. L. Articulated, left valve exterior displaced on top of right valve interior, Paratype UCMP 110759. Range of shell lengths: 2.2–3.2 mm.
Figure 13 in Paleogene marine bivalves of the deep-water Keasey Formation in Oregon, Part II: The pteriomorphs
Figure 13. Bathyisognomon smithwickensis? Right valve exterior, left valve exterior, and exterior view of ligament pits on large, incomplete specimen from Loc. LACM IP5806. Scale bar=5 cm.
Figure 12. Bathyisognomon smithwickensis n in Paleogene marine bivalves of the deep-water Keasey Formation in Oregon, Part II: The pteriomorphs
Figure 12. Bathyisognomon smithwickensis n. sp. A–C. Right valve exterior, left valve exterior, and exterior view of ligament pits, double-valved holotype, UCMP 110744. D–F. Right valve exterior, left valve exterior, and exterior view of ligament pits, double valved paratype, UCMP 110745. Scale bars=5 cm.
Figure 22 in Paleogene marine bivalves of the deep-water Keasey Formation in Oregon, Part II: The pteriomorphs
Figure 22. Propeamussium (Parvamussium) mistensis n. sp., uncoated latex casts of three paratypes. A. Left valve exterior, USNM 561853. B. Left valve exterior, USNM 561856. Right valve exterior, USNM 561850. Scale bars=3 mm.
Figure 21 in Paleogene marine bivalves of the deep-water Keasey Formation in Oregon, Part II: The pteriomorphs
Figure 21. Propeamussium (Parvamussium) mistensis n. sp., paired color images of molds in matrix and corresponding ammonium chloride-coated casts. A. Left valve exterior, holotype USNM 561849, length 8 mm. B. Left valve exterior, paratype USNM 561856, length 8.1 mm. C. Right valve exterior, paratype USNM 561850, length 5 mm. D. Right valve exterior on top of left valve, paratype USNM 561854, length 7 mm. E. Left valve interior, Paratype USNM 561852, length 6 mm.
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OpenNeuro
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