Microtextural properties of ooids in the middle Jurassic-lower Cretaceous,central Taurus carbonate platform, Antalya, Turkey

Ooids occurring in the middle Jurassic-lower Cretaceous carbonate sediments of Akseki, Antalya (Turkey) are of two distinct kinds. Type 1 ooids are sm all and of irregular shape. They have 1 to 4 cortical laminae with a fine r adial structure and patchy micritization. The nucleus of this type is compo sed of micrite and in places is not visible. In the radial part of this kin d of ooid, microporosity and/or microopenings seem to be micro-borings. Typ e 2 ooids are large and well rounded with vaguely visible nuclei. They disp lay fine concentric micritic laminae which coincide with endolithic microor ganisms and microborings of fossils. These ooids accumulated in a subtidal and lagoonal calm-water environment. Cyanobacteria and endolithic algae are thought to have contributed to the f ormation of these ooids.