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7 results for “Glaciomarine sediment”
Fig. 4 in A new sediment-dwelling pholadid bivalve from Oligocene glaciomarine sediments of King George Island, West Antarctica
Fig. 4. Schematic illustration of exterior of Pholadidea gradzinskii sp. nov., showing main morphological features discussed. Left lateral (A), anterior (B), dorsal (C), and ventral (D) views.
Fig. 3. A in A new sediment-dwelling pholadid bivalve from Oligocene glaciomarine sediments of King George Island, West Antarctica
Fig. 3. A. Outcrops of glaciomarine strata of the Oligocene Polonez Cove Formation (the Siklawa Member) on King George Island, arrow indicates position on Pholadidea gradzinskii horizons at Mazurek Point (photograph by AG, January 2007). B. Diamictite from bed in Siklawa Member of the Polonez Cove Formation, with Pholadidea gradzinskii bearing moulds at the base (arrowed). The diamictite contains metamorphic (m) and granitoid (g) clasts.
Fig. 8 in A new sediment-dwelling pholadid bivalve from Oligocene glaciomarine sediments of King George Island, West Antarctica
Fig. 8. Paleogene arrangement of Southern Gondwana with distribution of species of Pholadidea in The Weddellian Biogeographic Province from the Late Cretaceous–Paleogene. Abbreviations: 1, Pholadidea (Hatasia) wiffenae, Campanian–Maastrichtian; 2, Pholadidea frenguellii, Eocene; 3, Pholadidea patagonica, Oligocene–early Miocene; 4, Pholadidea gradzinskii, Oligocene; CAS, Central American Seaway; full arrows, possible dispersal route of Pholadidea from New Zealand to Antarctica/South America during the latest Cretaceous and the Paleogene (in the latest Cretaceous situation, New Zealand was immediately adjacent to Australia and Antarctica); stippled arrows, two possible dispersal routes of Pholadidea out from the Weddellian Biogeographic Province. Map adopted after Clarke and Crame (1989).
Fig. 1. A in A new sediment-dwelling pholadid bivalve from Oligocene glaciomarine sediments of King George Island, West Antarctica
Fig. 1. A. Map of Antarctic Peninsula area, arrow shows position of King George Island in South Shetland Islands archipelago. B. King George Island showing location of the study area. C. Low Head–Lions Rump area, arrow shows position of Pholadidea gradzinskii sp. nov. horizons at Mazurek Point (after Gaździcki et al. 1982).
Fig. 7 in A new sediment-dwelling pholadid bivalve from Oligocene glaciomarine sediments of King George Island, West Antarctica
Fig. 7. Vertical transverse sections through pholadid bivalve Pholadidea gradzinskii sp. nov. (ZPAL Mo XVIII/12/A–W), preserved in life position within a boring from the Oligocene of King George Island. The numbers refer to distance from the anterior of the shell in milimeters. Abbreviations: ap, apophysis; b, beak; ch, chondrophore; cl, callum; dcle, dorsal extension of the callum; hp, hypoplax; mt, metaplax; r, rasp; sp, siphonoplax; ur, umbonal reflection.
Fig. 5 in A new sediment-dwelling pholadid bivalve from Oligocene glaciomarine sediments of King George Island, West Antarctica
Fig. 5. Pholadid bivalve Pholadidea gradzinskii sp. nov. (ZPAL Mo. XVIII/3, holotype) from the Oligocene of King George Island. A. Left-lateral view of the complete specimen (A1), arrow marks deformation of the callum; anterior of the left valve (A2), showing callum covered with growth lines. B. Rightlateral view of the complete specimen (B1), arrow marks deformation of the callum; anterior of the right valve (B2), showing umbonal reflection raised anteriorly and appressed on the umbo. C. Dorsal view of the complete specimen showing metaplax formed by partially calcified periostracal mantle connecting the dorsal margin of the valves. D. Ventral view of the complete specimen showing a hypoplax formed by partially calcified periostracal mantle extending beyond the ventral margin of the shells and connected with the callum; arrows mark deformation of the callum and hypoplax. E. Inclined dorsal view of the anterior showing umbonal reflection covered with the dorsal extension of the callum. F. Anterior view showing the callum and umbonal reflection covered by the dorsal extension of the callum.
Fig. 2 in A new sediment-dwelling pholadid bivalve from Oligocene glaciomarine sediments of King George Island, West Antarctica
Fig. 2. Simplified lithostratigraphic profile of the Polonez Cove Formation, with lithological profile of the Siklawa Member at Mazurek Point where investigated fossils were collected. The arrow marks the mudstone interval where the majority of the specimens of Pholadidea gradzinskii sp. nov. described in this paper was collected. The lithostratigraphy after Birkenmajer (1983), Porębski and Gradziński (1987), Birkenmajer (2001), Troedson and Smellie (2002). Dating of the units after Smellie et al. (1984), Birkenmajer (1989), Dingle et al. (1997), Dingle and Lavelle (1998), and Troedson and Smellie (2002). The lithological profile of the Siklawa Member at Mazurek Point partially adapted from Gaździcki et al. (1982).
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