bivalves were an important component of low-latitude, shallow marine communities from the Late Jurassic until the end Cretaceous mass extinction.
Near the base of the ridge, slightly to the west of the lowest point, one can observe in situ rudist
fossils (extinct bivalves; Fig.
Filkorn (2005) reported the first occurrence of the hippuritid rudist
bivalve Barrettia sparcilirata Whitfield, 1897 from the Upper Cretaceous of the North American west coast along with the more widely distributed caprinid rudist
Coralliochama orcutti White, 1885, from the locality.
Shell disintegration and taphonomic loss in rudist
and coral patch reefs occurred commonly in the shallow waters, with shelf margin reefal facies occurring farther southeast along the developing Stuart City Reef Trend (Stricklin et al.
The interiors of the shallow Cretaceous and Eocene carbonate caps range from shallow subtidal environments characterized by oolite shoals, occasionally deepening into depths of perhaps 10 to 20 meters with rudist
banks, to supratidal depositional environments.
biostratigraphy in the Campanian-Maastrichtian of the southcentral Pyrenees, Spain.
Pelecypoda fragments, Gastropoda fragments, Coral, Rudist
, Algal debrise, Ostracoda
Stratigraphic evidence suggests that this nerineid paleocommunity occupied a back-reef area updip from rudist
The limestone bed with Polyconites clusters lying on the top of the Parede beach section indicates the growth of small rudist
buildups on the carbonate platform.
Picture E: The middle and inner shell of Rudist
has been dissolved and filled by a blocky cement due to its aragonitic mineralogy (Kuh-e-Dezdaran section, natural light, TD80 sample).
reef limestone on top of the exhumed peridotites suggests that overthrusting occurred in the pre-late Campanian (Schmidt-Effing 1980).