...F igure 4. MDS plot for sites at Conch Reef (Δ C-10, * C-18, ○ C-30) and Tennessee Reef (⋄ T-8 and • T-20), 1995–2000 (2D stress: 0.12). Overlying circles are for illustrative purposes only. Site numbers correspond to water depth in meters. ...

... palmata . Associated bioclastic carbonate sand locally contains articulated cobble-size valves of the lucine Codakia orbicularis and entire conch shells of Strombus gigas , mollusks that still inhabit the sandy shallows between the island’s north shore and a fringing reef beyond. Imbricated limestone...

...D. Korn; J. W. Tilsley SUMMARY Ammonoids from the late Asbian (B 2b Assemblage Biozone) Cracoean buildups or reefs of the Peak District (Derbyshire and Staffordshire, England) are revised. Utilizing new collections and additional museum material, enhanced descriptions and illustrations are possible...

...FIGURE 1 —Map of study area including sites investigated. The star on the map enlargement of Conch Reef (lower left) indicates the position of the Aquarius underwater laboratory; N20, N30, S20, and S30 indicate deep-reef sites. Depth contours in meters for deep-reef sites, and feet for shallow...

...J. A. May; R. D. Perkins Abstract Carbonate substrates prepared from conch shells and inorganic cleaved calcite were planted both at and below the sediment-water interface in a back barrier sound of North Carolina, within a mudbank of Florida Bay, and along a barrier reef transect in Belize. SEM...

..., and especially the chambered wing-like extensions likely associated with photosymbiosis. Several different taxa of Norian age inhabited lagoon and reef-related settings on four separate terranes of western North America (Antimonio terrane, Sonora, Mexico; Wallowa terrane, northeastern Oregon; Stikine terrane...

... , fig. 8). These authors described the Milldale Limestone outcrops in detail and showed that the formation comprised well-bedded, variable grey limestones (grainstones) or Waulsortian mound ‘knoll reef’ development. The maximum thickness is around 320 m in the Dovedale area, with dark, fine...

..., nestling behaviour and commensal embedment by a lingulid brachiopod, and epifaunal attachment by two cornulitids. As a benthic island, the gastropod conch provided a favourable isolated habitat for hard substrate colonizers. This unique specimen sheds light on the broader Paleozoic ecosystem, including...

... platforms. In the six reef-building horizons, with three of these in the Late Ordovician, and three in the Llandovery, broken nautiloid conchs are not uncommonly found in the peri-reefal grainstones. Only in the Chicotte reef and peri-reefal sediments did the nautiloids become more common, but usually also...

... and Seilacher, 1996 ). Probably most of these deductions are correct; however, actual observations confirming these deductions have not been made. Modern Nautilus lives at depths of 200–500 m on reef fronts in the Indo-Pacific; these conditions occur in the region around New Caledonia ( Fig. 1 ). Recovery...

...David H. Evans; Marcela Cichowolski Abstract The type specimens of Eothinoceras americanum Ulrich et al., 1944 , type species of the genus Eothinoceras Ulrich et al., 1944 , are revised based on new photographic material. The resulting interpretation of the conch shape of Eothinoceras shows...

.... The nautiloid associations occur mainly in the middle ( O. evae Zone) and upper parts ( E. suecicus Zone) of the San Juan Formation. Nautiloid conchs represent approximately 5% of the total macrofauna in the lower part of the sequence and up to 20% in the upper levels. The nautiloids are commonly associated...

... ), although mesocosm experiments suggest that reef-building organisms lack this ability ( Langdon et al., 2000 ; Schneider and Erez, 2006 ). Nonetheless, the ability to convert HCO 3 to CO 3 2− via proton regulation at the site of calcification, and/or utilize HCO 3 − directly in calcification, may...

... of the ascocerid conch (the juvenile or cyrtocone and the mature or brevicone) joined together, which is a very rare condition in the known paleontological record. The specimens are interpreted as at a subadult stage of development because fully grown ascocerids would have lost the juvenile shell. A planktonic...

... course of the growth lines and constrictions of the shell. Further review of conch dimensions of the holotype reveals a typical umbilical diameter/conch diameter ranging between 0.23 mm and 0.26 mm, which is too involute for assignment to the genus Uraloceras . Furthermore, unpublished notes by Z. Zhou...