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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 2 in First Cretaceous teleostean otolith assemblage (Arkadelphia Formation, upper Maastrichtian) from Arkansas, USA, early Gadiformes, and the Western Interior Seaway

Figure 2. Regional map of otolith-bearing Cretaceous sites mentioned in the text. Dashed line shows approximate shoreline during the late Maastrichtian (Roberts and Kirschaum 1995, Dastas et al. 2014, Stringer and Sloan 2018).

Figure 4 in First Cretaceous teleostean otolith assemblage (Arkadelphia Formation, upper Maastrichtian) from Arkansas, USA, early Gadiformes, and the Western Interior Seaway

Figure 4. Geologic section of borings B-5, B-6, B-8, B-9, and B-10 at the Cabot site, Lonoke County, Arkansas, USA. Black shapes designate the approximate level at which otoliths were recovered (bgl m=below ground level in meters). The shape is indicative of the number of otoliths recovered at that level: circle=less than 10 specimens; triangle=11–100 specimens; rectangle=101–500 specimens; and star=greater than 500 specimens.

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 7 in A new fossil Euspira? (Mollusca: Gastropoda: Naticidae) from the Gubik Formation on the North Slope of Arctic Alaska

Figure 7. Depth data for selected species, showing the majority of recovered species co-occur between 20 and 50 m with a few taxa occurring shallower and some occurring deeper.

Figure 6 in A new fossil Euspira? (Mollusca: Gastropoda: Naticidae) from the Gubik Formation on the North Slope of Arctic Alaska

Figure 6. Map showing generalized occurrences of Euspira? louiemarincovichi along the northern coastal plain of Alaska. These occurrences are concentrated in three areas: adjacent to the Colville River (southern eastern occurrences), near and along the Kogru River/Teshekpuk Lake (northern eastern occurrences), and along Skull Cliff (occurrences southwest of Barrow to the west). Not all collections are represented in this figure, just enough to determine the general geographic areas where this new species occurs. Some addition geographic names are mentioned to help interpret the geographic ranges of some gastropods.

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 1 in First Cretaceous teleostean otolith assemblage (Arkadelphia Formation, upper Maastrichtian) from Arkansas, USA, early Gadiformes, and the Western Interior Seaway

Figure 1. Stratigraphy of the Arkadelphia Formation and other formations discussed in the text based primarily on McFarland (2004). The gray-shaded area represents an unconformity.

Figures 1–4 in A new fossil Euspira? (Mollusca: Gastropoda: Naticidae) from the Gubik Formation on the North Slope of Arctic Alaska

Figures 1–4. Euspira? louiemarincovichi n. sp. UCMP holotype 123663, UCMP locality IP23235 (USGS M7346). Bar = 1 cm. 1. Aperical view, 2. Apical view, 3. Umbilical view, 4. Inclined side view. Photographs by Dave Strauss, UCMP.

Figure 5 in A new fossil Euspira? (Mollusca: Gastropoda: Naticidae) from the Gubik Formation on the North Slope of Arctic Alaska

Figure 5. Close–up of spiral and radial sculpture on the body whorl of the holotype specimen. Field of view approximately 0.5 cm. Blue arrow indicates radial sculpture, red arrow indicates spiral sculpture. angle of the aperture is acute and points towards the apex. A deep, partially open umbilicus is present, but is obscured in part by the umbilical callus making it tear– drop shaped.

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 9 in First Cretaceous teleostean otolith assemblage (Arkadelphia Formation, upper Maastrichtian) from Arkansas, USA, early Gadiformes, and the Western Interior Seaway

Figure 9. Maastrichtian otolith localities in North America and otolith-based faunal communities (bioprovinces) based on Schwarzhans and Stringer (2020a). The Western Interior Seaway community is outlined in green, and the localities are shown in green circles. The Appalachian community is outlined in red, and the localities are shown in red circles. The number in the circle is the number of species known from the localities. The white star is the Arkadelphia Formation site at Cabot, Arkansas, and the focus of this study. The base paleogeographic map was modified from Blakey (2014) and Scotese (2014).

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 6 in First Cretaceous teleostean otolith assemblage (Arkadelphia Formation, upper Maastrichtian) from Arkansas, USA, early Gadiformes, and the Western Interior Seaway

Figure 6. Otoliths from the Cretaceous Arkadelphia Formation. All specimens unless otherwise noted are inner views of right sagittae. Length in mm. A. Kokenichthys navis Schwarzhans and Stringer (2020b), DMNH 2021-09-9, 4.10 mm. B. Clupeiform? indeterminate DMNH 2021-09-10, 1.42 mm. C. Arius subtilis Schwarzhans and Bratishko (2011), DMNH 2021-09-11, 4.61 mm. D. Vorhisia vulpes Frizzell (1965b), DMNH 2021-09-13, 2.49 mm. E. Vorhisia vulpes Frizzell (1965b), DMNH 2021-09-14, 3.06 mm. F. Vorhisia vulpes Frizzell (1965b), DMNH 2021-09-15, 3.99 mm. G. Vorhisia vulpes Frizzell (1965b), DMNH 2021-09-16, 7.98 mm. H. Vorhisia vulpes Frizzell (1965b), DMNH 2021-09-12, 19.36 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.