... will cover the internal surface of the calcite layer. Amorphous calcium carbonates (ACC) were found in various taxa: Ascidiacea, Octocorallia and Molluscs ( Weiner et al ., 2003 ). The larval shells of Crassostrea (pelecypod) are mainly composed of ACC and an aragonite phase ( Weiss et al. , 2002...

...David I. MacKinnon Abstract A minute pelecypod, T. paparua n. gen. and n. sp. is described from a limestone lens of late Middle Cambrian age occurring within the Tasman Formation northwest Nelson Province, South Island, New Zealand. The morphology of Tuarangia is distinct from that of fordilloids...

...H. Edward Clifton Abstract Participation in man-in-the-sea experiments Tektite I and II permitted an examination of the orientation of pelecypod shells and shell fragments on sediment unaffected by waves or currents. Whether on vegetated or unvegetated unrippled sand or on solid coral...

...E. William Behrens; Richard L. Watson Abstract Differential sorting of right and left valves of pelecypods was found to be common on Mustang and Padre Island beaches, Texas. Determination of stable orientations of valves in unidirectional flume currents enables one to predict their behavior...

... a complex case history of one fossil assemblage. These surficial and shallow-burrowing pelecypods commonly are broken and randomly scattered through about 6 in. of calcarenite. Circumstantial evidence suggests that the bottom disturbance was caused by rooting predatory fish. Subsequently, valves were...

...K. O. Emery Abstract The commonest and most stable position of empty valves of large pelecypods on the wave-washed zone of beaches is concave down; this position is due to the presence of fast currents and the absence or inadequacy of bioturbation. In contrast, most large pelecypod valves...

...Robert W. Frey Abstract Modern pelecypod burrows, Solemya, Tagelus GeoRef, Copyright 2004, American Geological Institute. Reference includes data from Bibliography and Index of North American Geology, U. S. Geological Survey, Reston, VA, United States 1968 ...

...W. B. N BERRY; A. J BOUCOT Abstract European and North African Silurian graptolites occur with pelecypods, orthoceratids, crinoids, and ostracodes. A pelecypod-graptolite faunal association characterizes Silurian age strata in most of North Africa, the Near East, and continental Europe. The nature...

...James L. Murphy Abstract A reevaluation of the Pennsylvanian nuculoid pelecypod genus Anthraconeilo Girty (1911) reveals that it is a junior synonym of Palaeoneilo Hall and Whitfield, 1869. Girty's type species, A. taffiana, Yoldia carbonaria Meek, and Y. knoxensis McChesney are all considered...